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Transmission patterns of progressive damage and reliability analysis of reservoir-induced landslides considering local tensile failure 认领 引用
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作者 Minghao Miao Huiming Tang +5 位作者 Yinlong Jiang Kun Fang Changdong Li Cheng He Peng Cao Sha Lu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期913-931,共19页
Reservoir-induced landslides in China's Three Gorges Reservoir area are prone to tensile cracks due to the influenceof their own weight and fluctuationsin water levels.The presence of cracks indicates that the ten... Reservoir-induced landslides in China's Three Gorges Reservoir area are prone to tensile cracks due to the influenceof their own weight and fluctuationsin water levels.The presence of cracks indicates that the tensile stress in the area has exceeded the tensile strength of the soil,leading to local instability.To explore the impact of tensile failure behavior on the stability and failure modes of reservoir landslides,the Huangtupo Riverside Slump#1 is taken as a case study.By considering local tensile failure,potential tensile cracks are incorporated into the analysis via the limit equilibrium method and reliability theory.The reliability of landslides under different tensile failure scenarios is quantified.Strain-softening characteristics of the soil are combined to further analyze the failure transmission path of the landslide.Finally,these potential failure modes were validated through physical model tests.The results show that cracks developing at rear positions reduce the stability of the slope and increase the probability of instability.During the destruction process,retrogressive failures with multiple sliding surfaces are likely to occur.However,tensile failure at the forefront reduces the likelihood of an individual slide mass descending.Progressive failure results in both regular and skip transmission patterns.Additionally,cracks and water level changes can also lead to shifts in the positions of the most dangerous blocks.Therefore,in practical landslide analysis and prevention,it is necessary to consider local tensile damage and identify potential tensile crack locations in advance to optimize prevention measures and accurately evaluate landslide risk. 展开更多
关键词 Reliability analysis Tensile failure Reservoir landslide Progressive damage Failure mode Tensile crack
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Effect of Initial Microstructure States on Flow Behavior of Al-Zn-Mg-Cu Alloy During Hot Tensile Deformation 认领 引用
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作者 Wang Shuyan Zhou Yuting +3 位作者 Du Ruibo Long Shuai Lin Haitao Wang Shaoyang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第2期302-314,共13页
To investigate the influence of Al-Zn-Mg-Cu alloy with as-homogenized and as-rolled initial microstructures on the tensile flow behavior,isothermal tensile tests were conducted on a GLEEBLE-3500 isothermal simulator a... To investigate the influence of Al-Zn-Mg-Cu alloy with as-homogenized and as-rolled initial microstructures on the tensile flow behavior,isothermal tensile tests were conducted on a GLEEBLE-3500 isothermal simulator at temperatures of 380-440℃and strain rates of 0.05-1 s−1.The Johnson-Cook model,Hensel-Spittel model,strain-compensated Arrhenius model,and critical fracture strain model were established.Results show that through the evaluation of the models using the correlation coefficient(R)and the average absolute relative error,the strain-compensated Arrhenius model can represent the flow behavior of the alloy more accurately.Shear bands are more pronounced in the as-homogenized specimens,whereas dynamic recrystallization is predominantly observed in as-rolled specimens.Fracture morphology analysis reveals that a mixed fracture mechanism is prevalent in the as-homogenized specimen,whereas a ductile fracture mechanism is predominant in the as-rolled specimen.The processing maps indicate that the unstable region is reduced in the as-rolled specimens compared with that in the as-homogenized specimens.The optimal hot working windows for the as-homogenized and as-rolled specimens are determined as 410-440℃/0.14-1 s−1and 380-400℃/0.05-0.29 s−1,respectively. 展开更多
关键词 Al-Zn-Mg-Cu alloy tensile flow behavior microstructure constitutive modelling processing map
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Effect of texture and grain structure on tensile strength and anisotropy in annealed Al-Cu-Mg alloy with high Cu/Mg mass ratio 认领 引用
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作者 Guang-yu HE Zhi-yi LIU +2 位作者 Yang-cheng HU Qian JIANG M.S.QURASHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期694-708,共15页
Texture and grain structure evolution during annealing and their effects on tensile strength and anisotropy were studied using XRD,DSC,SEM,EBSD and TEM.The results indicate that elevated rolling temperatures reduce th... Texture and grain structure evolution during annealing and their effects on tensile strength and anisotropy were studied using XRD,DSC,SEM,EBSD and TEM.The results indicate that elevated rolling temperatures reduce the f(g)max(Copper)/f(g)max(Brass)ratio,increase S-Brass fine bands,and promote S-dispersoid precipitation,leading to finer recrystallized grains.Dominant recrystallization textures transform from Goss+P to Goss and then to Goss+Cube with increasing rolling temperature.Annealing at 350℃shows four tensile strength response stages:fast softening I,rapid strengthening II,slow strengthening III,and slow softening IV.The transition from Stages I to II is driven by the formation of strong Goss and P textures,and Stage IV is linked to enhanced Cube texture.Plates with Goss+Cube textures and fine equiaxed grains exhibit the lowest YS/UTS ratio and minimal anisotropy. 展开更多
关键词 Al-Cu-Mg alloy Goss texture P texture Cube texture grain structure tensile strength anisotropy
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Dynamic Biaxial Tensile Experiment of Cruciform Specimen with Electromagnetically Actuated Punch 认领 引用
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作者 Wei Liu Chenhao Xie +2 位作者 Bo Peng Jiaqi Li Shangyu Huang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第1期81-89,共9页
The dynamic deformation behaviors of aluminum alloy sheets often differ from the quasi-static ones.Here,a dynamic biaxial tensile experiment of cruciform specimens has been proposed with electromagnetically actuated p... The dynamic deformation behaviors of aluminum alloy sheets often differ from the quasi-static ones.Here,a dynamic biaxial tensile experiment of cruciform specimens has been proposed with electromagnetically actuated punch.A notched cruciform specimen was adopted to obtain heterogeneous deformation covering from equal-biaxial tensile to uniaxial tensile strain path.The inverse identification was used to determine the parameters of Hill48 and YLD2000-2D anisotropic yield functions for 5052-O aluminum alloy sheet.The YLD2000-2D anisotropic yield function was validated by comparison of the simulated and experimental principal strains.By comparison with the anisotropic yield functions under quasi-static loading conditions,the anisotropic yielding behaviors of 5052-O aluminum alloy sheet are alleviated under dynamic loading conditions. 展开更多
关键词 Anisotropy Biaxial tensile test Dynamic loading Cruciform specimen Aluminum alloy sheet
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Corrosion effect of hydrochloric acid on the granite:Insights from electrical conductivity,mineral composition,and tensile behavior 认领 引用
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作者 Yanan Gao Yikang Cheng +3 位作者 Guanglei Cai Yuan Gao Jianwei Tian Mingzhong Gao 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期116-126,共11页
Hydrochloric acid(HCl)extensively exists in deep underground projects,arising from the transportation of industrial raw materials or fracturing fluids of petroleum engineering.It results in corrosion,which can signifi... Hydrochloric acid(HCl)extensively exists in deep underground projects,arising from the transportation of industrial raw materials or fracturing fluids of petroleum engineering.It results in corrosion,which can significantly impact the stability of surrounding rock structures.Therefore,in-depth analysis of the degradation of rock corroded by the HCl solution is an essential task for underground engineering.In this study,the granite specimens are initially treated with the HCl solution with various concentrations.Then,the tests and analyses,such as electrical conductivity(EC)measurements,mineral composition assays,and Brazilian splitting tests,are employed to investigate the corrosion mechanism of the HCl solution.Our results and findings are generally as follows:(1)As the immersion time increases,the EC exhibits a relatively high level at pH value of 1,a decreasing trend at pH value of 3,and an increasing trend at pH value of 5 and 7.(2)The HCl solutions with various concentration have different effect on mineral composition,characterized by an increase in proportion of SiO2 and a reduction in proportion of Na2O,Al2O3,K2O,MgO,and CaO,as the solution pH value decreases.(3)After immersion in the solutions with pH values of 1,3,and 5,the tensile strength of the granite decreases by 23.85%,20.84%,and 20.24%;the average stiffness of the specimen decreases by 29.29%,23.43%,and 11.97%;the proportion of releasable energy increases by 6%,4%,and -2%;the releasable energy decreases by 54.96%,26.09%,and 14.52%;and the dissipated energy decreases by approximately 68.85%,41.39%,and 5.41%,respectively.(4)The evolution of physical and mechanical properties of the immersed granite specimen can be analyzed from a chemical aspect.The corrosive action of HCl cleaves Si–O and Al–O chemical bonds within the granite,particularly altering the tetrahedral structures of its silicate components.This process involves breaking existing chemical bonds and the formation of new ones,ultimately destroying the silicate molecular structures.As the concentration of HCl increases,the rate of these reactions accelerates,progressively weakening the chemical bonds and consequently deteriorating the mechanical characteristics of the granite.These findings can deepen our knowledge about the corrosion effect of HCI solutions on natural surrounding rocks and serve as references for further research on rock corrosion mechanisms in underground engineering. 展开更多
关键词 corrosion effect electrical conductivity HCl solution mineral composition tensile behavior
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Mechanical response of porcine pia-arachnoid complex under high-strain rate tensile loading 认领 引用
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作者 Yongrou Zhang Jialuan Zhou +3 位作者 Ziji Yin Lingling Hu Jingyu Wang Liqun Tang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期575-588,共14页
The pia-arachnoid complex(PAC),functioning as a critical biomechanical interface between the skull and brain,requires precise dynamic characterization to improve traumatic brain injury(TBI)prediction under impact load... The pia-arachnoid complex(PAC),functioning as a critical biomechanical interface between the skull and brain,requires precise dynamic characterization to improve traumatic brain injury(TBI)prediction under impact loading.However,existing mechanical data for PAC under high-strain rate conditions remain scarce due to experimental challenges posed by its ultra-thin and low stiffness.Conventional metallic split Hopkinson bar systems encounter extremely weak signals when testing this tissue.In this study,we present the first high-strain rate dynamic tensile characterization of PAC.To address the challenge of weak transmission signals,a double-bullet electromagnetic driven split Hopkinson stretch bar system with polycarbonate bars was used.Three dynamic tensile tests were conducted at varying strain rates,achieving a maximum strain rate of 1800 s−1.Experimental results reveal significant strain rate sensitivity and nonlinear stress-strain behavior.A rate-dependent constitutive model for PAC was established based on the Yeoh hyperelasticity model and the Bernstein-Kearsley-Zapas viscoelastic theory.Model parameters were optimized using a hybrid approach combining particle swarm optimization and genetic algorithm.The proposed constitutive equation effectively captures the strain rate sensitivity and nonlinear mechanical characteristics of PAC across a wide range of strain rates.The measured dynamic properties and validated constitutive model provide essential biomechanical data for PAC,thereby advancing the predictive capability of TBI simulations under high-speed impact conditions. 展开更多
关键词 Pia-arachnoid complex High-strain rate tensile loading Split Hopkinson stretch bar Visco-hyperelastic constitutive model
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Dynamic tensile strength and fracture evolution of characteristic shale with bedding and hole using linear regression theory 认领 引用
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作者 Yabo Chai Ning Luo +5 位作者 Jianan Zhou Haohao Zhang Penglong Li Yu Wang Cheng Zhai Tianran Ma 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第2期426-445,共20页
In methane in situ explosion fracturing technology,it is critical to investigate the effects of bedding characteristics and perforation holes on the dynamic mechanical properties and fracture behavior of shale reservo... In methane in situ explosion fracturing technology,it is critical to investigate the effects of bedding characteristics and perforation holes on the dynamic mechanical properties and fracture behavior of shale reservoirs.Dynamic Brazilian splitting experiments were conducted to investigate the effects of the bedding angle and the central aperture on the dynamic mechanical properties and fracture behavior of shale disc samples with a central hole using a modified split Hopkinson pressure bar device,a three-dimensional digital image correlation system,and high-speed photography.Multiple regression analysis was used to evaluate the influence on the dynamic tensile strength,while fracture evolution characteristics,including area and morphology,were selected to quantify fracture complexity.The results showed that the bedding angle exerted a more pronounced effect on the tensile strength compared to the central aperture,and increasing impact pressure amplified both effects.Tensile fractures predominated across varying bedding angles,while larger central apertures promoted shear fracture formation.The bedding plane facilitated the expansion of shear fractures in its direction,while the central hole primarily guided fracture propagation along the bedding plane.Fracture initiation occurred at the central hole's edge,with subsequent propagation influenced by both the bedding angle and the central aperture.Higher impact pressures resulted in a significant increase in the fracture area,with 90°bedding and larger apertures(8 and 10 mm)resulting in larger areas.These findings provide essential theoretical guidance for constructing efficient shale reservoir fracture networks in methane in situ explosion fracturing,particularly for applications in deep shale formations. 展开更多
关键词 3D-DIC dynamic tensile strength fracture evolution characteristics m-SHPB multiple regression analysis method
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A new perspective on tensile yield plateau formation in extruded Mg-4.83Gd-2.36Nd-0.21Zr alloy 认领 引用
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作者 Chunhui Wang Guangyu Yang +1 位作者 Zhiyong Kan Wanqi Jie 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第4期241-258,共18页
The occurrence of the tensile yield plateau in Mg alloys is relatively rare and its underlying reasons have been controversial.In this study,we systematically investigated the deformation mechanism of an extruded Mg-4... The occurrence of the tensile yield plateau in Mg alloys is relatively rare and its underlying reasons have been controversial.In this study,we systematically investigated the deformation mechanism of an extruded Mg-4.83Gd-2.36Nd-0.21Zr alloy,which exhibited an obvious tensile yield plateau.Quasi-in-situ EBSD analysis revealed that basal slip was the predominant mechanism in the tensile yield stage,which was attributed to the weak rare earth texture that facilitated basal slip activation and the fine recrystallized grains that suppressed twinning.The yield drop resulted from the combined effects of the easy activation of basal slip and the dislocation pinning by solute atoms.Additionally,the random distribution of grain orientations,high grain boundary misorientation angles(GBMA),and small grain sizes hindered intergranular deformation transfer between neighboring grains.The weak deformation transfer contributed to the formation of yield point elongation.This work underscores the role of texture,grain orientations,and GBMA in determining the yield plateau,offering a new perspective on yield plateau formation in Mg alloys. 展开更多
关键词 Mg-Gd-Nd alloy Tensile yield plateau Rare earth texture Deformation mechanism Grain boundary misorientation angle
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Effect of gadolinium on the anisotropic tensile properties of a forged high sulfur steel through in-situ tensile experiment 认领 引用
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作者 Lifeng Zhang Hong Wei Yadong Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第3期844-860,共17页
The effect of manganese sulfide(MnS)inclusions and gadolinium–sulfide(Gd–S)inclusions on the deformation behavior of steel matrix at different stages was studied by in-situ tensile experiments using a scanning elect... The effect of manganese sulfide(MnS)inclusions and gadolinium–sulfide(Gd–S)inclusions on the deformation behavior of steel matrix at different stages was studied by in-situ tensile experiments using a scanning electron microscopy(SEM)at room temperature.Two in-situ tensile experiments of tensile force along the elongation direction of inclusions and perpendicular to the elongation direction were conducted.The hole-induced nucleation mechanism of different tensile directions and inclusion types during the tensile deformation process was revealed.When the tensile direction of the steel without Gd was parallel to the forging elongation direction,the tensile strength was 454 MPa.Meanwhile,long strip MnS inclusions were broken and shed,forming long strip holes perpendicular to the fracture direction.When the tensile direction was perpendicular to the forging elongation direction,the gap between long strip MnS inclusions and the steel matrix was expanded into a long strip hole parallel to the fracture direction,and the tensile strength was 402 MPa.Anisotropy of the steel was induced by long strip MnS inclusions.In the steel with a total gadolinium(T.Gd)content of 730 ppm,the tensile strength was 468 MPa when the tensile direction was parallel to the forging elongation direction.The tensile strength of the steel was 446MPa when the tensile direction was perpendicular to the forging elongation direction.The addition of Gd in the steel was beneficial to improve the tensile properties of the steel and reduce the anisotropy of the steel. 展开更多
关键词 gadolinium inclusions in-situ tensile anisotropy
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A strategy on the consistency of tensile strength of friction stir lap welding joint based on the same peak temperature 认领 引用 被引量：1
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作者 Xinqi Ji Yue Zhang +1 位作者 Wenhan Jin Xin Qi 《Metals Advances》 SCIE EI CAS CSCD 2026年第2期78-87,共10页
The strength at the end of weld is relatively small due to the sharp increase in welding temperature,resulting in a problem of inconsistent joint strength along the weld direction.Although this problem can be solved b... The strength at the end of weld is relatively small due to the sharp increase in welding temperature,resulting in a problem of inconsistent joint strength along the weld direction.Although this problem can be solved by means of placing the lead-out plate or removing the weld end,it inevitably leads to the waste of materials.In view of this,this study proposed a technical strategy for obtaining the equal peak temperature based on the synergy of numerical simulation and artificial neural network model,and thereby fabricating the welded joint with consistent strength along the weld direction.The friction stir lap welding(FSLW)process of 2024-T4 aluminum alloys was taken as the research object.Firstly,the samples for radial basis function neural network(RBFNN)were obtained by the numerical simulation method.Then,taking the rotating speed,the welding speed at the steady stage and the welding speed at the ending stage as the input,and the difference in the peak temperatures between these two stages as the output,the RBFNN prediction model was established,and then the regulation scheme of the welding speed at the ending stage was obtained based on the idea of equal peak temperature.Finally,the reasons for the consistency of joint strength along the weld direction were further investigated by the changes in the hook morphology at the advancing side and the microhardness of the material.The research results showed that based on the samples obtained by numerical simulation,the prediction accuracy of RBFNN model exceeded 99%.By comparing the joint strengths at the ending and steady stages,the regulation of the welding speed at the ending stage reduced the strength fluctuation of FSLW joint from 28.8%to 4.3%. 展开更多
关键词 Friction stir lap welding Consistency of tensile strength Equal peak temperature Numerical simulation Artificial neural network
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Eight times the tensile strength of cotton:The fiber conquering automotive,fashion,and architecture 认领 引用
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作者 Zhao Xinhua 《China Textile》 2026年第2期29-32,共4页
Hemp is often referred to as a“miracle fiber.”It is exceptionally strong,very durable,and provides numerous environmental benefits.It is so strong that it has a tensile strength up to eight times that of cotton.Hemp... Hemp is often referred to as a“miracle fiber.”It is exceptionally strong,very durable,and provides numerous environmental benefits.It is so strong that it has a tensile strength up to eight times that of cotton.Hemp fibers only get softer,and with each textile wash,they maintain structural integrity. 展开更多
关键词 hemp tensile strength fibers tensilestrength cotton environmentalbenefits automotive fashion
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Experimental and simulated studies on thin-film thermoelectric generator insensitive to tensile strain 认领 引用
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作者 Yanlong Li Hao Sun +2 位作者 Zhao Zhao Yingli Shi Guozhen Shen 《Journal of Semiconductors》 EI CAS CSCD 2026年第5期129-137,共9页
Thermoelectric power generation has attracted significant interest for its capability to directly convert thermal energy into electricity.Among various configurations,thin-film thermoelectric generators(TEGs)stand out... Thermoelectric power generation has attracted significant interest for its capability to directly convert thermal energy into electricity.Among various configurations,thin-film thermoelectric generators(TEGs)stand out due to their lightweight nature and facile integration,offering promising applications in waste heat recovery and wearable electronics.However,the performance of such devices under complex mechanical conditions,particularly under biaxial tensile strain,remains underexplored.In this work,we designed and fabricated a thin-film TEG insensitive to tensile strain and performed a parametric analysis using validated 3D numerical simulations to evaluate the effects of environmental conditions,material properties,and geometric parameters.Notably,the designed device maintained stable electrical performance under various biaxial tensile strains.Owing to its miniature and thin profile,variations in any component of the generator significantly affected its electrical performance.The results indicated that reduced thermal conductivity of the substrate and Ecoflex layer,as well as a thinner substrate,enhance the output voltage.Furthermore,longer thermoelectric legs within a certain range contributed to higher output voltage.Higher output voltage was more readily achieved when the inner radius length was close to the radius of the heat source.This work provides valuable insights for the development of high-performance compliant TEGs applicable in dynamic mechanical environments,such as complex stretching in the back and shoulder-elbow regions induced by human motion. 展开更多
关键词 thin-film thermoelectric generator tensile strain output performance insensitivity
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Contribution roles of different sizeγ’precipitation during tensile deformation at intermediate temperatures in a Ni-based superalloy GH4151 认领 引用
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作者 Xin-Yu Meng Shao-Min Lyu +6 位作者 Xing-Fei Xie Chao Tang Wu-Gang Yu Wei-Xue Hou Cheng-Yu Wang Jing-Long Qu Jin-Hui Du 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期118-130,共13页
The quantitative correlation betweenγ′precipitation evolution and competing deformation mechanisms in GH4151 superalloy under various heat treatment conditions remains unclear.Through systematically designed solutio... The quantitative correlation betweenγ′precipitation evolution and competing deformation mechanisms in GH4151 superalloy under various heat treatment conditions remains unclear.Through systematically designed solution treatments,three distinctγ′precipitation distributions were achieved,and tensile properties were characterized at room temperature and 800℃.The deformed microstructure was characterized,γ′precipitates were quantified,and fracture mechanisms were identified by scanning and transmission electron microscopy.The results demonstrate that the strengthening effect of the secondaryγ′precipitations depends on the synergistic contributions of the stacking fault(SF)and anti-phase boundary(APB)shearing associated with its size.The optimal strength performance is achieved at a secondaryγ′precipitate size of 115 nm,where APB shearing dominates while maintaining a balanced contribution with SF shearing mechanisms.Based on experimental evidence,quantitative correlations between the size ofγ′precipitates and deformation strengthening mechanisms are systematically established,with yield strength as the primary evaluation metric.Furthermore,the critical resolved shear stresses for the strengthening mechanisms under the given conditions are derived,and the contributions of various strengthening mechanisms are analyzed separately.Clarification of the dominant strengthening mechanisms and establishment of quantitative criteria for tailoringγ′precipitates to achieve optimal strength in GH4151 superalloy are presented. 展开更多
关键词 GH4151 superalloy γ′precipitation Solution treatment Tensile property Strengthening mechanism
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Effect of different artificial aging treatments on tensile creep behavior of extruded lean Mg−Al−Ca−Mn alloy 认领 引用
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作者 Ming-yu LI Zhi-ping GUAN +6 位作者 Jia-wang SONG Hong-jie JIA Pin-kui MA Gang WANG Wei YAN Ming-hui WANG Zhi-gang LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期112-123,共12页
The effects of artificial aging(T6)on the creep resistance with tensile stresses in the range of 50−80 MPa at 175℃were investigated for an extruded Mg−1.22Al−0.31Ca−0.44Mn(wt.%)alloy.The Guinier-Preston(G.P.)zones pr... The effects of artificial aging(T6)on the creep resistance with tensile stresses in the range of 50−80 MPa at 175℃were investigated for an extruded Mg−1.22Al−0.31Ca−0.44Mn(wt.%)alloy.The Guinier-Preston(G.P.)zones primarily precipitate in the sample aged at 200℃for 1 h(T6-200℃/1h),while the Al2Ca phases mainly precipitate in the sample aged at 275℃for 8 h(T6-275℃/8h).The T6-200℃/1h sample exhibits excellent creep resistance,with a steady-state creep rate one order of magnitude lower than that of the T6-275℃/8h sample.The abnormally high stress exponent(~8.2)observed in the T6-200℃/1h sample is associated with the power-law breakdown mechanism.TEM analysis illuminates that the creep mechanism for the T6-200℃/1h sample is cross-slip between basal and prismatic dislocations,while the T6-275℃/8h sample exhibits a mixed mechanism of dislocation cross-slip and climb.Compared with the Al2Ca phase,the dense G.P.zones effectively impede dislocation climb and glide during the creep process,demonstrating superior creep resistance of the T6-200℃/1h sample. 展开更多
关键词 Mg−Al−Ca−Mn alloy tensile creep artificial aging cross slip
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Machine Learning-Based Modeling of Tensile Properties of Glass-Fiber-Reinforced Polymer Pipes under Accelerated Saltwater Aging Conditions 认领 引用
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作者 Cristina Roxana Popa Maria Tănase +2 位作者 Gheorghe Brănoiu Elena-Emilia Sirbu Cătălina Călin 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第6期134-157,共24页
Glass-fiber-reinforced polymer(GFRP)pipes are increasingly used in aggressive environments due to their high corrosion resistance and favorable mechanical properties.However,long-term exposure to saline environments a... Glass-fiber-reinforced polymer(GFRP)pipes are increasingly used in aggressive environments due to their high corrosion resistance and favorable mechanical properties.However,long-term exposure to saline environments and elevated temperatures can lead to degradation of their structural performance.This study investigates the influence of accelerated saltwater aging on the tensile behavior and structural characteristics of GFRP pipes and proposes machine-learning-based predictive models for the ultimate tensile strength(UTS).Experimental specimens were immersed in a 3.5%NaCl solution under controlled temperature and exposure time conditions.Tensile testing revealed that the unexposed samples exhibited a maximum UTS of 79.63 MPa,while aged specimens showed a gradual reduction in strength,although more than 80%of the initial tensile strength was retained after 60 days of exposure.Statistical analysis indicated that temperature was the dominant factor,contributing 60.24%to the variation in UTS,followed by exposure time with 33.72%,with the regression model explaining 93.96%of the total variance(R²=0.9396).X-ray diffraction analysis revealed a decrease in the degree of crystallinity from 20.49%in the reference sample to 15.05%in the most degraded specimen,corresponding to an approximate 26.5%reduction,which correlated with the observed decline in mechanical strength.Several machine learning approaches were evaluated,including Artificial Neural Networks(ANN),Exponential Gaussian Process Regression,and Boosted Trees.Among them,ANN provided the highest predictive accuracy,demonstrating strong agreement between predicted and experimental UTS values.The results confirm that hydrothermal aging significantly affects both the microstructural and mechanical properties of GFRP pipes,while machine learning models represent effective tools for predicting their long-term performance under aggressive environmental conditions. 展开更多
关键词 Machine learning GFRP aging saltwater tensile properties X-ray diffraction
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Tensile and Relaxation Tests and Properties Studies of Polymer Materials for Marine Flexible Pipes 认领 引用
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作者 CHEN Kun-peng ZHANG Meng-meng +2 位作者 FU Shi-xiao CHEN Te DU Chang-jiang 《船舶力学》 EI CSCD 北大核心 2026年第6期910-924,共15页
Polymer materials are usually applied to the sheath layers on the surface of marine flexible pipes.Such kind of material exhibits certain nonlinear characteristics,specifically manifested as a stress-strain nonlineari... Polymer materials are usually applied to the sheath layers on the surface of marine flexible pipes.Such kind of material exhibits certain nonlinear characteristics,specifically manifested as a stress-strain nonlinearity and stress relaxation phenomena.In this paper,specimens are specially designed,and specific testing instruments are used according to relevant international standards to conduct tensile and stress relaxation tests on polymer materials for marine non-bonded pipes under high temperature environments.The tensile stress-strain curve and stress relaxation curve are obtained,and the Prony series constitutive parameters describing their stress relaxation characteristics are then identified from the stress relaxation test data,and verified using finite element method.Finally,the characteristics of stress relaxation in polymer materials are discussed.It is found that there is no pure elastic deformation stage in polymer materials during tensile deformation,and that the coexistence of elastic deformation and plastic deformation is reflected from the beginning of tensile deformation.The essence of stress relaxation phenomenon in polymer materials is the transformation from elastic to plastic deformation of the material.When plastic deformation accounts for the majority of internal deformation of the material,the percentage of stress reduction during the relaxation process will be smaller compared with the case when elastic deformation accounts for the majority.In engineering,if considering to reduce the effects of stress relaxation,polymer materials can be approximately taken as directly entering plastic deformation stage. 展开更多
关键词 polymer materials non-bonded flexible pipe tensile test high temperature stress relaxation test
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An assumed enhanced strain finite element framework for tensile fracturing processes with dual-mechanism failure in transversely isotropic rocks 认领 引用 被引量：1
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作者 Yang Zhao Rui Wang Jian-Min Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第3期1474-1488,共15页
We present an assumed enhanced strain finite element framework for the simulation of tensile fracturing processes in transversely isotropic rocks.Fractures along the weak bedding planes and through the anisotropic roc... We present an assumed enhanced strain finite element framework for the simulation of tensile fracturing processes in transversely isotropic rocks.Fractures along the weak bedding planes and through the anisotropic rock matrix are treated with distinct enrichment,and a recently proposed dualmechanism tensile failure criterion for transversely isotropic rocks is adopted to determine crack initiation for the two failure modes.The cohesive crack model is adopted to characterize the response of embedded cracks.As for the numerical implementation of the proposed framework,both algorithms for the update of local history variables at Gauss points and of the global finite element system are derived.Four boundary-value problem simulations are carried out with the proposed framework,including uniaxial tension tests of Argillite,pre-notched square loaded in tension,three-point bending tests on Longmaxi shale,and simulations of tensile cracks induced by a strip load around a tunnel in transversely isotropic rocks.Simulation results reveal that the proposed framework can properly capture the tensile strength anisotropy and the anisotropic evolution of tensile cracks in transversely isotropic rocks. 展开更多
关键词 Tensile fracture Assumed enhanced strain finite element Three-point bending test transversely isotropic rock Tensile failure criterion
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Effect of Heterogeneous Microstructural Morphology on Tensile Behavior in a Series of High-Strength Wind Power Steels 认领 引用
18
作者 Chong Gao Zi-Hao Chen +7 位作者 Zhi-Zhi Liang Li-Xi Xiong Jian-Chao Pang Heng Ma Kang He Shou-Xin Li Xiao-Wu Li Zhe-Feng Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第11期2047-2062,共16页
A series of high-strength wind power steels with various microstructural morphologies was produced by hot-rolled and thermo-mechanical controlled processes.The microstructure,microhardness,and tensile behavior observe... A series of high-strength wind power steels with various microstructural morphologies was produced by hot-rolled and thermo-mechanical controlled processes.The microstructure,microhardness,and tensile behavior observed using in-situ techniques in various types of steels were investigated.The experimental results demonstrated that the 3 microstructural morphologies(band-,net-,and fiber-structures)can be clarified and categorized;each type possesses different tensile strengths,yield behaviors,and strain hardening behaviors.This can be attributed to different strain distribution caused by the structural morphology;band-structure steels exhibit a yield plateau primarily attributed to the relatively weak constraint effect of pearlite on ferrite;net-structure steels display 3 strain hardening stages due to the staged plastic deformation;fiber-structure steels achieve superior strength through their uniform stress distribution.Furthermore,the initial strain hardening rate,transition strain,and uniform elongation were influenced by the features of the constituent phases.Based on these findings,methods for estimating the yield strength and tensile strength of the steels with two phases were discussed and experimentally validated. 展开更多
关键词 Wind power steels Microstructural morphology Tensile behavior In-situ tensile technique Strain hardening behavior
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A new technical approach for real-time tensile strength testing of high-temperature granite based on micro-tensile testing technology 认领 引用
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作者 Xianzhong Li Yinnan Tian +3 位作者 Zhenhua Li Shuai Heng Xiaodong Zhang Bing Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第8期1323-1339,共17页
The tensile strength of rocks under real-time high-temperatures is essential for enhanced geothermal system development.However,the complex occurrence and deep burial of hot dry rocks limit the quantity and quality of... The tensile strength of rocks under real-time high-temperatures is essential for enhanced geothermal system development.However,the complex occurrence and deep burial of hot dry rocks limit the quantity and quality of standard samples for mechanical testing.This paper compared the tensile strengths obtained from Brazilian splitting tests on standard samples(with a diameter of 50 mm and a thickness of 25 mm)and micro-tensile samples(with a diameter of 50 mm and a thickness of 25 mm)of two types of granites.A power-law size effect model was established between the two sets of data,validating the reliability of the testing method.Then,miniature Brazilian splitting under real-time high-temperature,combined with X-ray diffraction(XRD)revealed temperature-dependent strength variations and microstructural damage mechanisms.The results show that:(1)The comparison error between the tensile strength obtained by the fitting model and that of the measured standard samples was less than 6%.(2)In real-time high-temperature conditions,tensile strength of granite exhibited non-monotonic behavior,increasing below 300°C before decreasing,with sharp declines at 400–500°C and 600–700°C.(3)Thermal damage stems from the differences in the high-temperature behavior of minerals,including dehydration,phase transformation,and differential expansion. 展开更多
关键词 Dry hot rock development Real-time high-temperature tensile strength Micro-tensile testing High-temperature microscopic mechanism Size effect
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