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Pull-out capacity and energy absorption of cable bolts under impact loading 认领 引用
1
作者 Adel Mottahedi Naj Aziz +1 位作者 Alex Remennikov Ali Mirzaghorbanali 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期23-42,共20页
This study investigates the performance of high-strength cable bolts under impact loading conditions representative of rock bursts in underground environments.Although widely used,the dynamic behaviour of these cable ... This study investigates the performance of high-strength cable bolts under impact loading conditions representative of rock bursts in underground environments.Although widely used,the dynamic behaviour of these cable bolts has received limited experimental attention,and their effectiveness in seismically active zones remains a subject of ongoing debate.To address this gap,a reverse pull-out test machine integrated with a drop hammer rig was employed.Tests were conducted on 70-t SUMO bulbed and non-bulbed cable bolts with encapsulation lengths of 300 and 450 mm,subjected to an impact energy of 14.52 k J.Results indicate that non-bulbed cables,despite showing lower initial peak loads(average 218 vs.328 k N for bulbed cables at 300 mm encapsulation),demonstrated superior energy absorption(average 11.26 vs.8.75 k J)and displacement capacity(average 48.40 vs.36.25 mm).Increasing the encapsulation length for bulbed cables led to a reduction in initial peak load but improved displacement and energy absorption.The dominant failure mechanism was debonding at the cable-grout interface,characterised by frictional sliding and cable rotation.These findings provide new insights into the energy dissipation mechanisms of cables and support the development of more resilient ground support systems for dynamically active conditions. 展开更多
关键词 Rock reinforcement Cable bolt Impact loading Pull-out testing Mine seismicity Rock burst
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Pull-out重建法与Fast-fix缝合法治疗内侧半月板后根损伤的疗效对比 认领 引用
2
作者 沈哲源 彭巧英 +2 位作者 张占丰 郭松华 吴荣 《中国骨伤》 CAS CSCD 2026年第1期43-51,共9页
目的:探讨Pull out重建法与Fast fix全内缝合法对内侧半月板后根损伤患者中期的膝关节功能、骨关节炎进展及半月板外移的作用。方法:2019年6月至2022年1月共纳入接受手术治疗的75例内侧半月板后根损伤患者,根据治疗方式的不同,分为Pull ... 目的:探讨Pull out重建法与Fast fix全内缝合法对内侧半月板后根损伤患者中期的膝关节功能、骨关节炎进展及半月板外移的作用。方法:2019年6月至2022年1月共纳入接受手术治疗的75例内侧半月板后根损伤患者,根据治疗方式的不同,分为Pull out重建组以及Fast fix缝合组。Pull out重建组44例,男9例,女35例;年龄(51.23±4.89)岁;左侧17例,右侧27例。Fast fix缝合组31例,男7例,女24例;年龄(52.13±5.47)岁;左侧11例,右侧20例。采用Lysholm功能问卷和国际膝关节文献委员会膝关节评估表(International Knee Documentation Committee,IKDC)评分对患者膝关节功能进行评分。通过膝关节X线及MRI检查,评估关节炎进展情况和半月板愈合情况。结果:两组患者均获得随访,Pull out固定组(52.05±8.27)个月,Fast fix缝合组(52.00±7.13)个月。Pull out组手术时间(50.94±5.66)min长于Fast fix组的(31.34±3.99)min,差异有统计学意义(P=0.000)。Pull out组完全愈合34例,部分愈合9例,未愈合1例;Fast fix组完全愈合21例,部分愈合8例,未愈合2例;差异无统计学意义(P>0.05)。两组术前及末次随访K L分级以及MRI检查的软骨损伤分级比较,差异均无统计学意义(P>0.05);两组末次随访与术前比较,差异均无统计学意义(P>0.05)。两组末次随访,Lysholm评分及IKDC评分总分比较,差异无统计学意义(P>0.05)。Pull out组术前半月板外移22例,末次随访半月板外移30例,差异有统计学意义(P=0.010);Fast fix组术前半月板外移17例,末次随访半月板外移23例,差异有统计学意义(P=0.000)。Pull out组半月板外移术前3.05(2.50,4.08)mm,末次随访3.35(2.73,4.00)mm,差异无统计学意义(P=0.183);Fast fix组半月板外移术前3.50(2.30,4.30)mm,末次随访3.60(2.90,4.60)mm,差异有统计学意义(P=0.000)。两组末次随访时半月板外移发生率和外移程度比较,差异均无统计学意义(P>0.05)。结论:Pull out修复法与Fast fix缝合法治疗内侧半月板后根损伤的患者时均能够改善膝关节功能。两种治疗方式术后均可获得满意的愈合率,并且均不会导致膝骨关节炎的快速进展。 展开更多
关键词 半月板后根损伤 半月板修复 Pull out重建法 全内缝合法
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Research on Influencing Factors of Pull-out Test in Detecting Concrete Bond Strength 认领 引用
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作者 HAN Jian 《外文科技期刊数据库（文摘版）工程技术》 2026年第9期084-089,共6页
The bond strength of concrete determines the anchorage performance of steel bars, crack control and coordinated stress bearing of structural components. The pull-out test can convert the interface force transfer proce... The bond strength of concrete determines the anchorage performance of steel bars, crack control and coordinated stress bearing of structural components. The pull-out test can convert the interface force transfer process into measurable data including load, slip and failure mode. Nevertheless, the test results are affected by multiple factors such as mechanical properties of concrete, surface morphology of reinforcements, geometric configuration, specimen fabrication, loading scheme, measurement methods and pre-existing damage. This paper analyzes the interface force transfer mechanism, parameter effects, test control and result interpretation. It points out that the nominal bond strength only represents the average response under specific boundary conditions, and a single peak value cannot fully reflect the bearing characteristics of the interface. During testing, unified standards shall be implemented for effective anchorage length, relative cover thickness, centering of loading and water content of specimens. Comprehensive evaluation shall be conducted combined with peak slip, initial stiffness, residual strength, curve shape and failure mode. The proposed analysis framework improves the comparability and interpretability of pull-out test results, and provides technical support for material screening, anchorage structure optimization and damage condition evaluation. 展开更多
关键词 concrete bond strength pull-out test bond-slip interface bearing capacity
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Interface Shear Behavior Between Bio-Inspired Sidewall of a Scaled Suction Caisson and Sand Under Pull-out Load 认领 引用
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作者 LI Da-yong LIANG Hao +1 位作者 ZHAO Ji-peng ZHANG Yu-kun 《China Ocean Engineering》 SCIE EI CSCD 2025年第4期708-717,共10页
The scaled suction caisson repre sents an innovative design featuring a bio-inspired sidewall modeled after snake skin,commonly utilized in offshore mooring platforms.In comparison with traditional suction caissons,th... The scaled suction caisson repre sents an innovative design featuring a bio-inspired sidewall modeled after snake skin,commonly utilized in offshore mooring platforms.In comparison with traditional suction caissons,this bio-inspired design demonstrates reduced penetration resistance and enhanced pull-out capacity due to the anisotropic shear behaviors of its sidewall.To investigate the shear behavior of the bio-inspired sidewall under pull-out load,direct shear tests were conducted between the bio-inspired surface and sand.The research demonstrates that the interface shear strength of the bio-inspired surface significantly surpasses that of the smooth surface due to interlocking effects.Additionally,the interface shear strength correlates with the aspect ratio of the bio-inspired surface,shear angle,and particle diameter distribution,with values increasing as the uniformity coefficient Cudecreases,while initially increasing and subsequently decreasing with increases in both aspect ratio and shear angle.The ratio between the interface friction angleδand internal friction angle δs defines the interface effect factor k.For the bio-inspired surface,the interface effect factor k varies with shear angleβ,ranging from 0.9 to 1.12.The peak value occurs at a shear angleβof 60°,substantially exceeding that of the smooth surface.A method for calculating the relative roughness RN is employed to evaluate the interface roughness of the bio-inspired surface,taking into account scale dimension and particle diameter distribution effects. 展开更多
关键词 scaled suction caisson interface shear test shear strength interface friction angle bio-inspired surface pull-out load
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An experimental investigation on the design and application of an intelligent drainage system to enhance the pull-out strength of geosynthetic reinforced soil 认领 引用
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作者 Tabish Ali 《Intelligent Geoengineering》 2025年第3期141-150,共10页
This research shows the outcomes of laboratory-scale experiments to enhance the pull-out capacity of geosynthetic reinforced soil via an intelligent drainage system.The intelligent drainage system is designed inside a... This research shows the outcomes of laboratory-scale experiments to enhance the pull-out capacity of geosynthetic reinforced soil via an intelligent drainage system.The intelligent drainage system is designed inside a pull-out machine and is made of gravel and geotextiles.The drained water is collected in a container.The experiments were conducted following ASTM standard D 6706-01.Various test parameters,such as soil moisture levels and the magnitude of external loads,were considered during the experimental procedure.The experiments included temperatures of 20℃,35℃,and 50℃with an initial saturation of about 90%.The results showed that the temperature-aided intelligent drainage system increased the pull-out strength of the geosynthetic reinforced soil.Furthermore,there was also an increase in the interaction coefficient and the interface friction angle.Therefore,the detrimental effects of a saturated geosynthetic reinforced soil,especially during heavy rains which often cause failure,can be diminished by the proposed system.The research findings indicated that the intelligent drainage system enhanced the pull-out capacity and strength-related parameters of the geosynthetic reinforced soil by approximately 25%,thereby augmenting its internal stability.The practical implications of these results are thoroughly examined in the paper. 展开更多
关键词 GRS Effect of temperature Pull-out strength Weathered granite soil Thermal drainage Geogrid and geotextile
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Tapered Suction Caissons:A Numerical Investigation into Their Pull-out Performance 认领 引用 被引量：5
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作者 M.Zeinoddini J.Keyvani M.Nabipour 《China Ocean Engineering》 SCIE EI 2009年第4期695-707,共13页
Suction caissons have been widely used as anchors and foundations for floating and fixed offshore platforms. The pull-out performance of conventional suction caissons （with upright walls） has been investigated by a ... Suction caissons have been widely used as anchors and foundations for floating and fixed offshore platforms. The pull-out performance of conventional suction caissons （with upright walls） has been investigated by a number of researchers. However, no attention has been paid to tapered suction caissons. This paper deals with the performance of tapered suction caissons under vertical pull-out loads. A numerical approach is used for this purpose. The numerical model is first verified against test data available for common upright caissons. The verified model is then used to study the pullout performance of tapered suction caissons. It is noticed that the pull-out capacities exhibited by tapered suction caissons are in general considerably higher than those from their corresponding traditional upright caissons. To obtain an insight into this superior behaviour, effects from certain soil/caisson/drainage parameters on the pull-out capacity of tapered suction caissons are studied. Soil cohesion is noticed to have a linear improving effect on the capacity of both upright and ta- pered suction caissons. The soil internal friction angle is noticed to have an exponential increasing effect on the pull-out capacity. With a constant caisson diameter, an increase in the aspect ratio is seen to particularly influence the pull-out capacity. With a constant caisson length, an increase in the aspect ratio is discovered to result in non-linear decrease in the pull-out capacity. Under undrained conditions, tapered models generally show less sensitivity to above mentioned soil/caisson parameters as compared with those under drained conditions. 展开更多
关键词 suction caisson pull-out capacity numerical study upright caisson tapered caisson offshore structure sand clay drained undrained
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DYNAMIC CRACK MODELS ON PROBLEM OF BRIDGING FIBER PULL-OUT OF COMPOSITE MATERIALS 认领 引用 被引量：1
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作者 吕念春 程云虹 +2 位作者 胥红敏 程靳 唐立强 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第10期1194-1202,共9页
An elastic analysis of an internal central crack with bridging fibers parallel to the free surface in an infinite orthotropic anisotropic elastic plane was performed. A dynamic model of bridging fiber pull-out of comp... An elastic analysis of an internal central crack with bridging fibers parallel to the free surface in an infinite orthotropic anisotropic elastic plane was performed. A dynamic model of bridging fiber pull-out of composite materials was presented. Resultingly the fiber failure is governed by maximum tensile stress, the fiber breaks and hence the crack extension should occur in self-similar fashion. By the methods of complex functions, the problem studied can be transformed into the dynamic model to the Reimann-Hilbert mixed boundary value problem, and a straightforward and easy analytical solution is presented. Analytical study on the crack propagation subjected to a ladder load and an instantaneous pulse loading is obtained respectively for orthotropic anisotropic body. By utilizing the solution, the concrete solutions of this model are attained by ways of superposition. 展开更多
关键词 bridging fiber pull-out crack dynamic model analytical solution
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Pull-out tests and slope stability analyses of nailing systems comprising single and multi rebars with grouted cement 认领 引用 被引量：6
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作者 Sang-Soo Jeon 《Journal of Central South University》 SCIE EI CAS 2012年第1期262-272,共11页
The pull-out capacities for soil nailing systems comprising of one single 29 mm diameter(type A) and four 16 mm diameter(type B) rebars with grouted cement were examined.A field test and numerical analysis for the typ... The pull-out capacities for soil nailing systems comprising of one single 29 mm diameter(type A) and four 16 mm diameter(type B) rebars with grouted cement were examined.A field test and numerical analysis for the type A and type B systems were carried out to investigate the pull-out capacities and the slope stability reinforcement efficiency in soil and rock slopes.The results of the pull-out tests show the mobilized shear force and load transfer characteristics with respect to soil depth.The load-displacement relationship was examined for both type A and type B systems.Slope stability analyses were carried out to study the relationships between soil and nail reinforcement and bending stiffness as well as combined axial tension and shear forces.Factors of safety were calculated in relation to the number of nails and their outside diameters.Both soil and rock slopes were included in this evaluation. 展开更多
关键词 soil nailing bending resistance pull-out test finite difference method
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Experimental Study on Pull-out Behavior of Different Geotextiles 认领 引用 被引量：1
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作者 周蓉 丁辛 《Journal of Donghua University(English Edition)》 EI CAS 2007年第4期497-499,共3页
The pullout testing of geosynthetics is essential for studying interface interaction in the soil-reinforcement system. In this paper, a new method for testing interface properties of geotextiles is proposed. The inter... The pullout testing of geosynthetics is essential for studying interface interaction in the soil-reinforcement system. In this paper, a new method for testing interface properties of geotextiles is proposed. The interface frictional characters of two kinds of geotextiles (woven and needle-punched nonwoven) are investigated through pullout test. Nonwoven specimen has more wide variety of displacement along length than that of woven under the same pressure because of their different extensibility. The greater the elongation and deformation of specimens, the more evident the variations of displacement along reinforcement from front to pullout end. The greater the normal pressure, the smaller the displacement of every position along length with the same pullout load. The study focuses on the effects of the tensile modulus and the difference of pullout response between woven and nonwoven geotextiles. 展开更多
关键词 geotextile pull-out compare normal pressure tensile modulus
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Prediction of a maximum pull-out load of anchor bolts using an optimal combination model 认领 引用 被引量：2
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作者 Ma Wenjie Wang Binglong +1 位作者 Wang Xu Wang Bolin 《Journal of Southeast University(English Edition)》 EI CAS 2021年第2期199-208,共10页
The mixed model of improved exponential and power function and unequal interval gray GM(1,1)model have poor accuracy in predicting the maximum pull-out load of anchor bolts.An optimal combination model was derived usi... The mixed model of improved exponential and power function and unequal interval gray GM(1,1)model have poor accuracy in predicting the maximum pull-out load of anchor bolts.An optimal combination model was derived using the optimally weighted combination theory and the minimum sum of logarithmic squared errors as the objective function.Two typical anchor bolt pull-out engineering cases were selected to compare the performance of the proposed model with those of existing ones.Results showed that the optimal combination model was suitable not only for the slow P-s curve but also for the steep P-s curve.Its accuracy and stable reliability,as well as its prediction capability classification,were better than those of the other prediction models.Therefore,the optimal combination model is an effective processing method for predicting the maximum pull-out load of anchor bolts according to measured data. 展开更多
关键词 anchor bolt maximum pull-out load mixed model of improved exponential and power function(MIEPF)model unequal interval gray GM(1,1)model optimal combination model
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Mechanical Characterisation of Interface for Steel/Polymer Composite Using Pull-out Test: Shear-Lag and Frictional Analysis 认领 引用
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作者 Mohamed KHARRAT Maher DAMMAK Amine CHARFI 《Journal of Materials Science & Technology》 SCIE EI CAS 2006年第4期552-558,共7页
Fibre-matrix interface is known to have contribution to the mechanical performance of fibre-reinforced composite by its potential for load transfer between the fibre and the matrix. Such load transfer is of great impo... Fibre-matrix interface is known to have contribution to the mechanical performance of fibre-reinforced composite by its potential for load transfer between the fibre and the matrix. Such load transfer is of great importance in dentistry when a post is used for fixing a ceramic crown on the tooth. In this study, a pull-out test was carried out to analyse the interfacial properties of a steel fibre embedded in a polyester and epoxy matrices. It was found that the fibre-matrix interface is debonded on the whole embedded length when the fibre stress reached the debonding stress. Then, the fibre stress fell down to the initial extraction stress required to pulling out the debonded fibre from the matrix. Both debonding stress and initial extraction stress initiated a linear increase with the implantation length after the debonding stress reached horizontal asymptotes. To analyse the fibre-matrix load transfer before debonding, an analytical shear-lag model was adopted to in this test conditions. Fitting the experimental results with the analytical model provided the interfacial shear strength. By considering the Coulomb friction at the fibre-matrix interface during the fibre extraction process, an analytical model which considers Poisson＇s effects on both fibre and matrix, was developed. In this model, knowledge of the initial extraction stress of the fibre provides the residual normal stress at the fibre-matrix interface. 展开更多
关键词 Fibre Matrix Interface Pull-out Shear-lag Debonding Friction
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Evaluation of the pull-out strength of galvanised steel strips in a cement-based material 认领 引用
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作者 Maziar RAMEZANI Juan VILCHES Thomas NEITZERT 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2013年第12期843-855,共13页
The study of the interfacial and bond behaviour of reinforced cement-based materials is important for understanding the mechanical behaviour of such composites.This paper presents extensive experimental,theoretical an... The study of the interfacial and bond behaviour of reinforced cement-based materials is important for understanding the mechanical behaviour of such composites.This paper presents extensive experimental,theoretical and finite element analyses of pull-out tests of galvanised steel strips with different geometries,in lightweight cement-based material blocks with different densities and mechanical properties.The theoretical model proposed here is capable of determining the pull-out strength and bond stress versus the slip relationship between components of reinforced cement-based materials.This bond-slip relationship is then implemented in finite element simulation through the user-defined subroutine of ABAQUS software.Based on the results,a trilinear bond-slip model is suitable for modelling the interface between a steel strip and a cement-based material interface. 展开更多
关键词 Bond-slip relationship Cement-based materials Galvanised steel strip Pull-out test
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Study on Single-fiber Pull-out Method for Evaluating Interfacial Strength in CFRP 认领 引用
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作者 Yudong, H. Zhiqian, Zh. +1 位作者 Lixun, L. Qiwei, L. 《High Technology Letters》 EI CAS 1995年第1期105-108,共4页
Single-fiber pull-out testing (SFPOT) methods are frequently used to evaluate the interfacial adhesion between fiber and matrix in composite materials. To make such pull-out measurements, however, the length of embedd... Single-fiber pull-out testing (SFPOT) methods are frequently used to evaluate the interfacial adhesion between fiber and matrix in composite materials. To make such pull-out measurements, however, the length of embedded fiber must be small enough so that the fiber does not break before it is pulled freely. This is difficult to achieve by conventional methods with fibers of small diameter, such as the carbon fibers. In this paper, a fiber pull-out experiment is described. Specialized apparatus in our laboratory, as well as this technique for sample preparation are discussed in detail. The interfacial shear strength of carbon fiberesin matrix composites is analyzed quantitatively by using the finite-element method. The SFPOT system has been proved to be an available means for the study of interfacial properties for carbon fiberesin matrix composites. 展开更多
关键词 Carbon fiber Composite materials Interfacial shear strength Single-fiber pull-out
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Nature of the Pull-out System of Carbon Nanorope/Polyethylene Composite and Twisting Effect on Interfacial Behavior 认领 引用
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作者 尚军军 杨庆生 LU Yubin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第3期713-719,共7页
The nature of the pull-out system of carbon nanorope/polyethylene（CNRP/PE） composite is studied by using molecular dynamics approach. The deformation of the CNRP/PE composites in pull-out process is exhibited. The i... The nature of the pull-out system of carbon nanorope/polyethylene（CNRP/PE） composite is studied by using molecular dynamics approach. The deformation of the CNRP/PE composites in pull-out process is exhibited. The influence of twisting deformation on the interfacial interaction of the composites is investigated. The results show that the energy of the pull-out system is conserved; and the interfacial bonding is weak resulting in a sliding failure of the CNRP inside PE matrix. 展开更多
关键词 carbon nanorope nano-composite pull-out system fracture mechanism
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Laboratory pull-out tests on fully grouted rock bolts and cable bolts:Results and lessons learned 认领 引用 被引量：31
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作者 Isabelle Thenevin Laura Blanco-Martín +3 位作者 Faouzi Hadj-Hassen Jacques Schleifer Zbigniew Lubosik Aleksander Wrana 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2017年第5期843-855,共13页
Laboratory pull-out tests were conducted on the following rock bolts and cable bolts:steel rebars,smooth steel bars,fiberglass reinforced polymer threaded bolts,flexible cable bolts,IR5/IN special cable bolts and Mini... Laboratory pull-out tests were conducted on the following rock bolts and cable bolts:steel rebars,smooth steel bars,fiberglass reinforced polymer threaded bolts,flexible cable bolts,IR5/IN special cable bolts and Mini-cage cable bolts.The diameter of the tested bolts was between 16 mm and 26 mm.The bolts were grouted in a sandstone sample using resin or cement grouts.The tests were conducted under either constant radial stiffness or constant confining pressure boundary conditions applied on the outer surface of the rock sample.In most tests,the rate of displacement was about 0.02 mm/s.The tests were performed using a pull-out bench that allows testing a wide range of parameters.This paper provides an extensive database of laboratory pull-out test results and confirms the influence of the confining pressure and the embedment length on the pull-out response(rock bolts and cable bolts).It also highlights the sensitivity of the results to the operating conditions and to the behavior of the sample as a whole,which cannot be neglected when the test results are used to assess the bolt-grout or the grouterock interface. 展开更多
关键词 Pull-out test Fully grouted bolts Laboratory-scale Confining pressure Embedment length Bolt-grout interface
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Effects of different pull-out loading rates on mechanical behaviors and acoustic emission responses of fully grouted bolts 认领 引用 被引量：9
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作者 DU Yun-lou FENG Guo-rui +2 位作者 KANG Hong-pu ZHANG Yu-jiang ZHANG Xi-hong 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第7期2052-2066,共15页
Due to the influence of mining disturbance stress,it is of great significance to better understand the bearing characteristics of fully grouted bolts under different pull-out loading rates.For this purpose,a series of... Due to the influence of mining disturbance stress,it is of great significance to better understand the bearing characteristics of fully grouted bolts under different pull-out loading rates.For this purpose,a series of laboratory pull-out tests were conducted to comprehensively investigate the effects of different pull-out loading rates on the mechanical performance and failure characteristics of fully grouted bolts.The results show that the mechanical performance of the anchored specimen presents obvious loading rate dependence and shear enhancement characteristics.With the increase of the pull-out loading rates,the maximum pull-out load increases,the displacement and time corresponding to the maximum pull-out load decrease.The accumulated acoustic emission(AE)counts,AE energy and AE events all decrease with the increase of the pull-out loading rates.The AE peak frequency has obvious divisional distribution characteristics and the amplitude is mainly distributed between 50-80 dB.With the increase of the pull-out loading rates,the local strain of the anchoring interface increases and the failure of the anchoring interface transfers to the interior of the resin grout.The accumulated AE counts are used to evaluate the damage parameter of the anchoring interface during the whole pull-out process.The analytical results are in good agreement with the experimental results.The research results may provide guidance for the support design and performance monitoring of fully grouted bolts. 展开更多
关键词 fully grouted bolts pull-out test loading rate mechanical behavior AE response failure characteristic
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Helical Fiber Pull-out in Biological Materials 认领 引用 被引量：4
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作者 Lixin Wang Yuhong Cui +2 位作者 Qinghua Qin Hui Wang Jianshan Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2016年第3期245-256,共12页
Many biological materials, such as wood and bone, possess helicoid microstructures at microscale, which can serve as reinforcing elements to transfer stress between crack surfaces and improve the fracture toughness of... Many biological materials, such as wood and bone, possess helicoid microstructures at microscale, which can serve as reinforcing elements to transfer stress between crack surfaces and improve the fracture toughness of their composites. Failure processes, such as fiber/matrix inter- face debonding and sliding associated with pull-out of helical fibers, are responsible mainly for the high energy dissipation needed for the fracture toughness enhancement. Here we present systemic analyses of the pull-out behavior of a helical fiber from an elastic matrix via the finite element method （FEM） simulation, with implications regarding the underlying toughening mechanism of helicoid microstructures. We find that, through their uniform curvature and torsion, helical fibers can provide high pull-out force and large interface areas, resulting in high energy dissipation that accounts, to a large extent, for the high toughness of biological materials. The helicity of fiber shape in terms of the helical angle has significant effects on the force-displacement relationships as well as the corresponding energy dissipation during fiber pull-out. 展开更多
关键词 biological materials helicoid microstructures fiber pull-out energy dissipation,toughness
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Inflatable rock bolt bond strength versus rock mass rating(RMR):A comparative analysis of pull-out testing data from underground mines in Nevada 认领 引用 被引量：3
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作者 Barnard Chase Kallu Raj R. +1 位作者 Warren Sean Thareja Rahul 《International Journal of Mining Science and Technology》 EI CAS CSCD 2016年第1期19-22,共4页
The purpose of this paper is to establish confidence in anticipated minimum bond strength for inflatable rock bolts by comparing the bond strength to variable geotechnical conditions using the rock mass rating(RMR)sys... The purpose of this paper is to establish confidence in anticipated minimum bond strength for inflatable rock bolts by comparing the bond strength to variable geotechnical conditions using the rock mass rating(RMR)system.To investigate a correlation between these parameters,the minimum bond strength of pull-out tested inflatable rock bolts was compared to the RMR of the rock in which these bolts were placed.Bond strength vs.RMR plots indicate that expected minimum bond strength is positively corre-lated with RMR;however,the correlation is not strong.Cumulative percent graphs indicate that 97~;of pull-out tests result in a minimum bond strength of 3.3 and 1.7 ton/m in RMR/〉45 and〈45,respectively.Although lower bond strengths are more commonly encountered in low RMR ground,high bond strengths are possible as well,yielding higher variability in bond strengths in low RMR ground.Bond strength of friction bolts relies on contact between the rock bolt and drill hole.Experience in Nevada indicates that RMR is known to affect both the quality and consistency of drill holes which likely affects bond strength.Drilling and bolting in low RMR ground is more sensitive to drilling and bolting practices,and strategies for maximizing bond strength in these conditions are discussed. 展开更多
关键词 Rock mass rating RMR Rock bolt Pull-out test Bond strength
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Pull-out Behaviour of Axially Loaded Screwed-in Threaded Rods Embedded in CLT Elements: Experimental Study 认领 引用 被引量：2
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作者 Huifeng Yang Junfeng Ji +3 位作者 Haotian Tao Benkai Shi Junbin Hu Bo Wen 《Journal of Renewable Materials》 EI CAS 2022年第1期105-117,共13页
Experimental investigation on the pull-out behaviour,including the withdrawal capacity,slip stiffness and inter-facial shear stress,of axially loaded screwed-in threaded rod embedded in cross laminated timber(CLT)was ... Experimental investigation on the pull-out behaviour,including the withdrawal capacity,slip stiffness and inter-facial shear stress,of axially loaded screwed-in threaded rod embedded in cross laminated timber(CLT)was con-ducted.Specimens with varying embedment length and different number of threaded rods were tested in this study.To prevent premature splitting failure of timber,some specimens were reinforced in the direction perpen-dicular to the timber grain with self-tapping screws.Test results showed that the screwed-in threaded rod con-nections exhibited good pull-out behaviour with high withdrawal capacity and slip stiffness.Within a certain range,the withdrawal capacity increases considerably with the increase of embedment length,while the average interfacial shear stress shows the opposite tendency.The self-tapping screws played an important role on reducing the splitting of the timber and improving the withdrawal capacity and slip stiffness of the screwed-in threaded rod.Additionally,for the specimens with self-tapping screw reinforcements,the improvement of withdrawal capacity and stiffness when increasing the number of threaded rods are much more obvious than that of the speci-mens without the self-tapping screws,due to the change of failure modes. 展开更多
关键词 Threaded rods screwed-in pull-out behaviour timber structure experimental study
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Anti-plane pull-out of a rigid line inclusion from an elastic medium 认领 引用
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作者 Yansong WANG Baolin WANG +1 位作者 Youjiang CUI Kaifa WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第5期809-822,共14页
The transient and static anti-plane problem of a rigid line inclusion pulled out from an elastic medium is studied.The singular integral equation method is used to solve the stress field.Under the static load,the stre... The transient and static anti-plane problem of a rigid line inclusion pulled out from an elastic medium is studied.The singular integral equation method is used to solve the stress field.Under the static load,the stress intensity factor(SIF)at the inclusion tips increases with the medium length.The problem becomes equivalent to an inclusion in a medium with an infinite length when the length of the medium is 3.5times longer than that of the inclusion.However,under the transient load,the maximum value of the SIF occurs when the medium length is about two times the inclusion length.Besides,the relation between the pull-out force and the anti-plane displacement is given.The conclusions are useful in guiding the design of fiber reinforced composite materials. 展开更多
关键词 pull-out rigid line inclusion anti-plane stress intensity factor(SIF) stress singularity
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