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Modeling prediction of temperature dependent fracture toughness for particle reinforced metal matrix composites 认领 引用
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作者 Pan Dong Guozheng Kang +2 位作者 Xuyao Zhang Weiguo Li Yi He 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期350-359,共10页
In this work,incorporating the impact of grain boundary sliding,a theoretical analytical model has been proposed for assessing fracture toughness at different temperatures of particle reinforced metal matrix composite... In this work,incorporating the impact of grain boundary sliding,a theoretical analytical model has been proposed for assessing fracture toughness at different temperatures of particle reinforced metal matrix composites.The model can achieve prediction of fracture toughness in varying temperature conditions by utilizing the yield strength and Young’s modulus of the metal matrix at room temperature,along with readily accessible material parameters.And the predictions have achieved good consistency with the measurements of five composites obtained from other scholars’references.Furthermore,based on the established model,the impact of particle volume fraction and particle size on the fracture toughness of composites,as well as their evolution with temperature were studied within the applicable range of the proposed model.This research not only provides an effective and convenient tool for evaluating the fracture toughness of composites serving in different temperature environments,but also lays the foundation for the strengthening and toughening design of composites. 展开更多
关键词 Particle reinforced metal matrix composites Fracture toughness Temperature dependent Modeling
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Effect of temperature and atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiCf/SiC composites:Experiments and modeling 认领 引用 被引量：1
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作者 Yong Deng Yi Hao +4 位作者 Huanfang Wang Weiguo Li Qiang Qin Bing Pan Chao Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第12期1-16,共16页
Ceramic matrix composites have broad application prospects in the aerospace field due to their high temperature resistance and oxidation resistance.The effect of temperature and environment atmosphere on the fracture ... Ceramic matrix composites have broad application prospects in the aerospace field due to their high temperature resistance and oxidation resistance.The effect of temperature and environment atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiCf/SiC composites was investigated.The results show that they exhibit pseudo-plastic deformation behavior at different temperatures.The fracture toughness is as high as 48 MPa m1/2at room temperature,and gradually decreases with rising temperature.The difference in fracture toughness between argon and air initially increases and then decreases with rising temperature.Furthermore,the high-temperature failure mechanisms of these composites were analyzed through macro and micro analysis.Based on this,a physic-based temperature-dependent fracture toughness model considering matrix toughness,plastic power,fiber pull-out,and residual thermal stress was developed for fiber-reinforced ceramic matrix composites.The model has been well validated by experimental results.An analysis of influencing factors regarding the evolution of fracture toughness was conducted by the proposed model.This work contributes to a better understanding of the mechanical performance evolution and failure mechanisms of ceramic matrix composites under multifield coupling conditions,thereby promoting their applications. 展开更多
关键词 SiCf/SiC composites Fracture toughness Analytical modelling Failure mechanisms High-temperature
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Static recrystallization and grain growth during annealing of an extruded Mg-Zn-Zr-Er magnesium alloy 认领 引用 被引量：7
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作者 Jing Zhang Weiguo Li Zhengxiao Guo 《Journal of Magnesium and Alloys》 CAS 2013年第1期31-38,共8页
Microstructure stability is essential to maintain a fine grain structure for an alloy throughout its processing.The effects of Er addition and its existing form on the static recrystallization and grain growth during ... Microstructure stability is essential to maintain a fine grain structure for an alloy throughout its processing.The effects of Er addition and its existing form on the static recrystallization and grain growth during annealing of an extruded Mg-1.5Zn-0.6Zr magnesium alloy were studied in this paper.The results showed that microstructure stability was much improved by Er addition and the best thermability was obtained in 2 wt.%Er-containing alloy.For the incomplete dynamic recrystallization(DRX)microstructures extruded at a lower temperature of 350℃,Er addition increased the resistance of static recrystallization;and for the complete DRX microstructures extruded at a relatively high temperature of 420℃,Er addition suppressed grain growth.The difference in microstructure stability was then correlated with the microstructure features.Both the intermetallic phase and the solute atoms of Er inα-Mg matrix contributed to the microstructure stability.Moreover,it is believed that the existing form of Er-Zn atom pairs in theα-Mg solid solution favored the most to improve the thermal stability of the alloy. 展开更多
关键词 Magnesium alloy Recrystallization Grain growth Rare earth element
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Temperature-Dependent Tearing Behavior of Rubber Materials:Characterization and Modeling 认领 引用
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作者 Qinyuan Yao Feilong Zhang +4 位作者 Pan Dong Ziyuan Zhao Yi He Weiguo Li Liming Chen 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2024年第2期316-326,共11页
With the increasingly widespread application of rubber in many fields,there is a growing demand for quantitative characterization of temperature-dependent mechanical properties in high-temperature service environments... With the increasingly widespread application of rubber in many fields,there is a growing demand for quantitative characterization of temperature-dependent mechanical properties in high-temperature service environments.The critical tearing energy is an important criterion for determining whether rubber materials will experience tearing instability,while tear strength is a key parameter for rubber materials to resist tearing.It is necessary to quantitatively characterize their evolution with temperature.Current theoretical research mainly relies on fitting a large amount of experimental data,which is not convenient for engineering applications.Therefore,in this work,a temperature-dependent critical tearing energy model is firstly developed based on the force-heat equivalence energy density principle.This model considers the equivalent relationship between the critical tearing energy required for crack instability propagation and the thermal energy stored in the rubber material.It is demonstrated that our model has higher prediction accuracy when compared to other models.Furthermore,combining with the Griffith fracture theory,temperature-dependent tear strength models applicable to three different crack modes are separately established.These models are validated using experimental data for Mode I opening cracks and ModeⅢtearing cracks,and good consistency is achieved.Additionally,a quantitative analysis of the influence of elastic modulus on tear strength at different temperatures is conducted.This work provides a reliable way for predicting temperature-dependent tearing instability behavior and offers beneficial suggestions for improving the tear strength of rubber materials at different temperatures. 展开更多
关键词 Temperature-dependent Critical tearing energy Tear strength Rubber Theoretical model
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Effect of electropulsing treatment on static recrystallization behavior of cold-rolled magnesium alloy ZK60 with different reductions 认领 引用 被引量：8
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作者 Huijun Guo Xun Zeng +5 位作者 Jianfeng Fan Hua Zhang Qiang Zhang Weiguo Li Hongbiao Dong Bingshe Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第6期1113-1120,共8页
Effect of electropulsing treatment(EPT) on recrystallization behavior of cold-rolled Mg alloy ZK60 strips was investigated. It was found that EPT significantly improved nucleation rate and migration ability of grain b... Effect of electropulsing treatment(EPT) on recrystallization behavior of cold-rolled Mg alloy ZK60 strips was investigated. It was found that EPT significantly improved nucleation rate and migration ability of grain boundaries, leading to accelerated recrystallization of the deformed metals at relatively low temperature. After the recrystallization induced by EPT, the average grain size of 20% rolling reduction samples decreased from 113 um to around 10 um, meanwhile the typical basal-type texture of the coldrolled sample was weakened. EPT was normally accompanied with a thermal and an athermal effects. The athermal effect played a dominated role in increasing nucleation rate, while the thermal effect promoted grain growth. A fewer recrystallized grains originated along the grain boundaries in the 10% reduction samples, while most of the recrystallization took place inside the twins in the 20% reduction samples. 展开更多
关键词 Mg alloys Recrystallization Athermal effect Twins
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Energy dissipation mechanism and ballistic characteristic optimization in foam sandwich panels against spherical projectile impact 认领 引用 被引量：2
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作者 Jianqiang Deng Tao Liu +4 位作者 Liming Chen Xin Pan Jingzhe Wang Shaowei Zhu Weiguo Li 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2024年第5期108-122,共15页
This study systematically examines the energy dissipation mechanisms and ballistic characteristics of foam sandwich panels(FSP)under high-velocity impact using the explicit non-linear finite element method.Based on th... This study systematically examines the energy dissipation mechanisms and ballistic characteristics of foam sandwich panels(FSP)under high-velocity impact using the explicit non-linear finite element method.Based on the geometric topology of the FSP system,three FSP configurations with the same areal density are derived,namely multi-layer,gradient core and asymmetric face sheet,and three key structural parameters are identified:core thickness(tc),face sheet thickness(tf)and overlap face/core number(no).The ballistic performance of the FSP system is comprehensively evaluated in terms of the ballistic limit velocity(BLV),deformation modes,energy dissipation mechanism,and specific penetration energy(SPE).The results show that the FSP system exhibits a significant configuration dependence,whose ballistic performance ranking is:asymmetric face sheet>gradient core>multi-layer.The mass distribution of the top and bottom face sheets plays a critical role in the ballistic resistance of the FSP system.Both BLV and SPE increase with tf,while the raising tcor noleads to an increase in BLV but a decrease in SPE.Further,a face-core synchronous enhancement mechanism is discovered by the energy dissipation analysis,based on which the ballistic optimization procedure is also conducted and a design chart is established.This study shed light on the anti-penetration mechanism of the FSP system and might provide a theoretical basis for its engineering application. 展开更多
关键词 Sandwich panel Numerical simulation Ballistic resistance Specific penetration energy Energy analysis
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Review on mechanics of ultra-high-temperature materials 认领 引用 被引量：19
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作者 Daining Fang Weiguo Li +4 位作者 Tianbao Cheng Zhaoliang Qu Yanfei Chen Ruzhuan Wang Shigang Ai 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2021年第9期1347-1370,I0001,共24页
Ultra-high-temperature materials have applications in aerospace and nuclear industry.They are usually subjected to complex thermal environments during service.The mechanical properties of materials in ultra-high-tempe... Ultra-high-temperature materials have applications in aerospace and nuclear industry.They are usually subjected to complex thermal environments during service.The mechanical properties of materials in ultra-high-temperature environments have been attracted increasing attentions.However,the characterization and evaluation of ultra-high-temperature mechanical properties of materials are still challenging work.This article presents a review on the mechanical properties of materials at elevated temperatures.The experimental results and techniques on the ultra-high-temperature mechanical properties of materials are reviewed.The constitutive models of materials at elevated temperatures are discussed.The recent research progress on the quantitative theoretical characterization models for the temperature-dependent fracture strength of advanced ceramics and their composites is also given,and the emphasis is placed on the applications of the force-heat equivalence energy density principle.The thermal–mechanical-oxygen coupled computational mechanics of materials are discussed.Furthermore,the outlook and concluding remarks are highlighted. 展开更多
关键词 Ultra-high-temperature materials Mechanical properties Mechanical testing Theoretical characterization Numerical simulation
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Exceptional mechanical properties of AZ31 alloy wire by combination of cold drawing and EPT 认领 引用 被引量：9
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作者 Zhaohui Shan Jing Bai +7 位作者 Jianfeng Fan Hongfei Wu Hua Zhang Qiang Zhang Yucheng Wu Weiguo Li Hongbiao Dong Bingshe Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第16期111-118,共8页
A 0.66 mm-diameter AZ31 alloy wire with ultimate tensile strength of 400 MPa and elongation of 28.5%was successfully prepared via the combination of cold-drawing and electropulsing treatment processing(EPT).Microstruc... A 0.66 mm-diameter AZ31 alloy wire with ultimate tensile strength of 400 MPa and elongation of 28.5%was successfully prepared via the combination of cold-drawing and electropulsing treatment processing(EPT).Microstructure observation showed that the grain size of EPTed samples was refined to about 1μm and the basal texture strength with maxima texture index was weakened to 7.18.EPT can significantly accelerate recrystallization by enhancing the mobility of dislocation and atomic diffusion due to the coupling of the thermal and athermal effects.Finally,uniform ultrafine-grained structure was obtained in the EPTed samples by static recrystallization completed in a very short time(30 s)at relatively low temperature(433 K). 展开更多
关键词 AZ31 alloy wire Electropulsing treatment Dislocation Atomic diffusion Microstructure Mechanical properties
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Extraordinary mechanical properties of AZ61 alloy processed by ECAP with 160° channel angle and EPT 认领 引用 被引量：6
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作者 Zhaohui Shan Jie Yang +6 位作者 Jianfeng Fan Hua Zhang Qiang Zhang Yucheng Wu Weiguo Li Hongbiao Dong Bingshe Xu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第2期548-559,共12页
AZ61 Mg alloy with homogeneous refined microstructure and exceptional mechanical properties was obtained by the combined technology of equal-channel angular pressing(ECAP)and electropulsing treatment(EPT)in this paper... AZ61 Mg alloy with homogeneous refined microstructure and exceptional mechanical properties was obtained by the combined technology of equal-channel angular pressing(ECAP)and electropulsing treatment(EPT)in this paper.Based on an ECAP die with an intersection angle of 160,the lower temperature is particularly adapted for AZ61 alloy to be deformed,in which accompanied by high accumulated defects density.The recrystallization of EPTed samples during different stages indicated that the recrystallization behavior of the deformed Mg alloy was mainly affected by the processing time and duration of EPT.Compared to those of the as-received samples,the average grain size of the EPTed samples was refined from 89μm to 1.0μm,accordingly the yields stress(YS)and ultimate tensile strength(UTS)were increased from 100 MPa and 260 MPa to 330 MPa and 448 MPa,respectively.The mechanisms of microstructure transformation and the reinforced mechanical properties were analyzed based on the strain of single ECAP,cumulative storage energy and the athermal effect of EPT. 展开更多
关键词 AZ61 Mg alloy Equal channel angular pressing Electropulsing treatment Recrystallization Mechanical properties
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The temperature-dependent fracture strength model for ultra-high temperature ceramics 认领 引用 被引量：24
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作者 Weiguo Li Fan Yang Daining Fang 《Acta Mechanica Sinica》 SCIE EI CAS 2010年第2期235-239,共5页
Breaking down the entire structure of a material implies severing all the bonds between its atoms either by applying work or by heat transfer. Because bond-breaking is indifferent to either means, there is a kind of e... Breaking down the entire structure of a material implies severing all the bonds between its atoms either by applying work or by heat transfer. Because bond-breaking is indifferent to either means, there is a kind of equivalence between heat energy and strain energy. Based on this equivalence, we assume the existence of a constant maximum storage of energy that includes both the strain energy and the corresponding equivalent heat energy. A temperaturedependent fracture strength model is then developed for ultrahigh temperature ceramics （UHTCs）. Model predictions for UHTCs, HfB2, TiC and ZrB2, are presented and compared with the experimental results. These predictions are found to be largely consistent with experimental results. 展开更多
关键词 Ultra-high temperature ceramics · Equivalent energy · Critical failure energy · Strength model
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Characteristics of long-gap AC streamer discharges under low pressure conditions 认领 引用 被引量：2
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作者 Yaqi YANG Weiguo LI +1 位作者 Yu XIA Chuangye YUAN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第10期20-25,共6页
The generation and propagation of a streamer is a significant physical process of air gap discharge. Research on the mechanism of streamers under low-pressure conditions is helpful for understanding the process of lon... The generation and propagation of a streamer is a significant physical process of air gap discharge. Research on the mechanism of streamers under low-pressure conditions is helpful for understanding the process of long-gap discharge in a high-altitude area. This paper describes laboratory investigations of streamer discharge under alternating current（AC） voltage in a low pressure test platform for a 60 cm rod–plane gap at 30 kPa, and analyzes the characteristics of streamer generation and propagation. The results show that the partial streamer and breakdown streamer all occur in the positive half-cycle of AC voltage near the peak voltage at 30 kPa. The partial streamer could cause the distortion of current and voltage waveform, and it appears as the branching characteristic at the initial stage. With the extension of the streamer, the branching and tortuosity phenomena become gradually obvious, but the branching is suppressed when the streamer crosses the gap. The low-pressure condition has little influence on the tortuosity length and the tortuosity number of the streamer, but affect the diameter of streamer obviously. 展开更多
关键词 streamer discharge low pressure AC voltage branching phenomenon
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Diversity and community structure of eukaryotic microalgae in surface sediments in the central Bohai Sea,China,based on a metabarcoding approach 认领 引用
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作者 Zhaohui WANG Chaofan WANG +4 位作者 Maoting WANG Weiguo LI Wencong ZHONG Lei LIU Tao JIANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2022年第6期2277-2291,共15页
Sediment samples were collected at 17 stations in the central Bohai Sea,China,and the diversity and community structure of eukaryotic microalgae were assessed by metabarcoding the V4 region of 18S r DNA.A total of 930... Sediment samples were collected at 17 stations in the central Bohai Sea,China,and the diversity and community structure of eukaryotic microalgae were assessed by metabarcoding the V4 region of 18S r DNA.A total of 930 operational taxonomic units(OTUs)were detected for microeukaryotes,including 98algal OTUs.The algal communities comprised 42 genera belonging to 19 classes of six phyla,and they were dominated by chrysophytes and dinoflagellates.Dinoflagellates were also the most diverse microalgal group.The nano-sized dinoflagellates Biecheleria halophila and Azadinium trinitatum occurred abundantly in the study area;however,they have not been reported previously,as they may be overlooked or misidentified in light microscopy.Many pico-sized chlorophytes were detected in the sediment samples.Sixteen of the detected OTUs were assigned to potentially harmful and/or bloom-forming microalgae,suggesting some potential risks of harmful algal blooms in the central Bohai Sea.The capacity of metabarcoding to detect morphologically cryptic and small species makes this method a sufficiently sensitive means of detection for assessing eukaryotic microalgae in sediments. 展开更多
关键词 microalgae dinoflagellate cysts high throughput sequencing marine sediment the Bohai Sea resting stages
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Comparison in diversity of eukaryotic algae in surface sediments from different functional sea areas of Qingdao coast,the Yellow Sea,China:a metabarcoding approach 认领 引用
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作者 Zhaohui WANG Mingdan LEI +4 位作者 Shuanghui JI Changliang XIE Jiazhuo CHEN Weiguo LI Tao JIANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2022年第6期2322-2342,共21页
Surface sediment samples were collected in three different functional sea areas in Qingdao coast,East China,including the inner Jiaozhou Bay,the Laoshan Coast,and the Amphioxus Reserve area.Diversity and community str... Surface sediment samples were collected in three different functional sea areas in Qingdao coast,East China,including the inner Jiaozhou Bay,the Laoshan Coast,and the Amphioxus Reserve area.Diversity and community structure of eukaryotic algae especially those of phytoplankton resting stages were assessed by metabarcoding V4 region of the 18S rDNA.Biogenic elements including total organic carbon(TOC),organic matter(OM),total nitrogen(TN),total phosphorus(TP),and biogenic silicon(BSi)were analyzed.A total of 1496 eukaryotic operational taxonomic units(OTUs)were measured,including 207algal OTUs,which contributed to 13.84%of the total OTUs.Ninety-eight species in 8 phyla,24 classes of eukaryotic algae were detected.Among them,47 species have been reported to form resting stages,and 12 species are firstly recorded in Chinese coastal waters.Dinofl agellates dominated in both DNA reads and OTU richness,which contributed to 73.02%and 61.35%of the eukaryotic algal sequences and OTU richness,respectively.DNA reads,OTU richness and alpha diversity indexes of eukaryotic algae were higher in the Laoshan Coast,and lower in Jiaozhou Bay.Eukaryotic algal community differed in the three sea areas,which was dominated by chrysophytes in Jiaozhou Bay,by dinofl agellates in the Laoshan Coast,and co-dominated by dinoflagellates and chrysophytes in the Amphioxus Reserve area.Clustering analysis showed that the Laoshan Coast and the Amphioxus Reserve area are clustered together,while Jiaozhou Bay is clustered separately.Thirty-six harmful algal bloom(HAB)species were detected,and 10 species have been reported to form blooms in Jiaozhou Bay and the Qingdao coast before.Some of these species occurred widely and dominantly in this study,suggesting high potential risk of HABs in the Qingdao coastal area. 展开更多
关键词 benthic microalgae 18S rDNA metabarcoding resting stages Jiaozhou Bay Yellow Sea
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Effect of Sintering Time on the Mechanical and Corrosion Behavior of Zn-Mg Composites with a Core-Shell Structure Prepared by SPS 认领 引用
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作者 Zeqin Cui Lei Zhou +4 位作者 Xiaohu Hao Mengda Luo Wenxian Wang Jianzhong Wang Weiguo Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2023年第8期1305-1316,共12页
Zn-10 Mg composite with a core-shell structure was prepared by spark plasma sintering(SPS)technology,and a systematic study of the microstructure and properties has been conducted for different sintering times.The she... Zn-10 Mg composite with a core-shell structure was prepared by spark plasma sintering(SPS)technology,and a systematic study of the microstructure and properties has been conducted for different sintering times.The shell layer dominated by the hard MgZn2 phase thickens with the increase in sintering time,which has a positive effect on the mechanical and degradation properties of the material.The sample sintered for 20 min(T-20)has the best mechanical properties,with a compressive strength of 226 MPa and a compression rate of 6.5%.The corrosion resistance of samples increases as the sintering time prolongs,while the hydrogen evolution volume and pH value decrease in the immersion experiment.Furthermore,the increase in the shell thickness significantly reduces the corrosion rate,which is attributed to the weakening of the galvanic corrosion reaction between the Mg core and the MgZn2 shell.Therefore,composite with unique core-shell structure provides an advanced design idea for degradable biomaterials,and a reasonable control of sintering time can provide the optimal design strategy. 展开更多
关键词 Zn-Mg composite Spark plasma sintering(SPS) Core-shell structure Mechanical property Degradation mechanism
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Effects of mechanical boundary conditions on thermal shock resistance of ultra-high temperature ceramics 认领 引用
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作者 Tianbao CHENG Weiguo LI +2 位作者 Yushan SHI Wei LU Daining FANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2015年第2期201-210,共10页
The effects of mechanical boundary conditions, often encountered in thermalstructural engineering, on the thermal shock resistance（TSR） of ultra-high temperature ceramics（UHTCs） are studied by investigating the TS... The effects of mechanical boundary conditions, often encountered in thermalstructural engineering, on the thermal shock resistance（TSR） of ultra-high temperature ceramics（UHTCs） are studied by investigating the TSR of a UHTC plate with various types of constraints under the first, second, and third type of thermal boundary conditions. The TSR of UHTCs is strongly dependent on the heat transfer modes and severity of the thermal environments. Constraining the displacement of the lower surface in the thickness direction can significantly decrease the TSR of the UHTC plate, which is subject to the thermal shock at the upper surface. In contrast, the TSR of the UHTC plate with simply supported edges or clamped edges around the lower surface is much better. 展开更多
关键词 thermal shock resistance（TSR） ultra-high temperature ceramic（UHTC） mechanical boundary condition temperature-dependent material property thermal environment
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Self-organized pattern on the surface of a metal anode in low-pressure DC discharge 认领 引用
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作者 Yaqi YANG Weiguo LI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第3期63-71,共9页
Self-organization phenomena on the surface of a metal electrode in low-pressure DC discharge is studied. In this paper, we carry out laboratory investigations of self-organization in a lowpressure test platform for 10... Self-organization phenomena on the surface of a metal electrode in low-pressure DC discharge is studied. In this paper, we carry out laboratory investigations of self-organization in a lowpressure test platform for 100–200 mm rod-plane gaps with a needle tip, conical tip and hemispherical tip within 1–10 k Pa. The factors influencing the pattern profile are the pressure value, gap length and shape of the electrode, and a variety of pattern structures are observed by changing these factors. With increasing pressure, first the pattern diameter increases and then decreases. With the needle tip, layer structure, single-ring structure and double-ring structure are displayed successively with increasing pressure. With the conical tip, the ring-like structure gradually forms separate spots with increasing pressure. With the hemispherical tip, there are anode spots inside the ring structure. With the increase of gap length, the diameter of the selforganized pattern increases and the profile of the pattern changes. The development process of the pattern contains three key stages： pattern enlargement, pattern stabilization and pattern shrink. 展开更多
关键词 self-organized pattern low pressure DC voltage metal anode pattern profile
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Algorithms for mesh repairing to represent automobile parts 认领 引用
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作者 Weiguo LI Wenhua YE Wenliang CHEN 《Journal of Modern Transportation》 2011年第4期252-260,共9页
In representing automobile parts with mesh in the field of reverse engineering or finite element generation, the mesh reconstruction and data exchanging between different CAD/CAM systems often introduce many invisible... In representing automobile parts with mesh in the field of reverse engineering or finite element generation, the mesh reconstruction and data exchanging between different CAD/CAM systems often introduce many invisible topological and geometrical errors into mesh. These artifacts can cause serious problems in subsequent operations such as finite element analysis, reverse engineering, animation, and simulation. In this study we propose a practical method for repairing topological and geometrical errors on mesh. First, coincident vertices during mesh input are removed, fol- lowed by the identification of non-manifold vertices and edges. The non-manifold vertices are modified, and the facets having non-manifold edges are removed. Finally, faces that have the wrong orientations in the mesh are re-oriented. Experiments show that our methods can eliminate most common mesh errors quickly and effectively. The refined mesh can be properly used in subsequent operations. 展开更多
关键词 mesh topological repairing geometrical repairing non-manifold vertices non-manifold edges automobile naris： finite element
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Resistance welding of glass fiber reinforced thermoplastic composite:Experimental investigation and process parameter optimization 认领 引用 被引量：2
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作者 Bing DU Liming CHEN +3 位作者 Houchang LIU Qinghao HE Weiming QIN Weiguo LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第12期3469-3478,共10页
The utilization of fiber reinforced thermoplastics(FRTP)is expected to fulfill lightweight demand in mass-produced aerospace products.Facing the unavoidable assembly of FRTP parts,fusion bonding methods such as resist... The utilization of fiber reinforced thermoplastics(FRTP)is expected to fulfill lightweight demand in mass-produced aerospace products.Facing the unavoidable assembly of FRTP parts,fusion bonding methods such as resistance welding are promising compared with mechanical joint and adhesive bonding.In this paper,a procedure has been brought out to understand the relationship between processing conditions and performance of the FRTP welding joints.The adherends were continuous glass fiber reinforced polypropylene(GF/PP)laminates fabricated by hotpressing method.The influences of time,current and pressure on the bending strength of the resistance welding joints were investigated.A processing window was drawn based on the optical observation of welded surfaces.The quantitative relationship between process parameters and mechanical property of GF/PP welding joint was established by Response Surface Method(RSM)with high accuracy.It was found that bending strength of GF/PP welding joint was improved by 31%compared with hot-pressing benchmark. 展开更多
关键词 Mechanical property Processing parameters Resistance welding Response Surface Method Thermoplastic
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Analysis of Spectral Characteristics Based on Optical Remote Sensing and SAR Image Fusion 认领 引用 被引量：4
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作者 Weiguo LI Nan JIANG Guangxiu GE 《Agricultural Science & Technology》 CAS 2014年第11期2035-2038,2040,共4页
Because of cloudy and rainy weather in south China, optical remote sens-ing images often can＇t be obtained easily. With the regional trial results in Baoying, Jiangsu province, this paper explored the fusion model an... Because of cloudy and rainy weather in south China, optical remote sens-ing images often can＇t be obtained easily. With the regional trial results in Baoying, Jiangsu province, this paper explored the fusion model and effect of ENVISAT/SAR and HJ-1A satel ite multispectral remote sensing images. Based on the ARSIS strat-egy, using the wavelet transform and the Interaction between the Band Structure Model （IBSM）, the research progressed the ENVISAT satel ite SAR and the HJ-1A satel ite CCD images wavelet decomposition, and low/high frequency coefficient re-construction, and obtained the fusion images through the inverse wavelet transform. In the light of low and high-frequency images have different characteristics in differ-ent areas, different fusion rules which can enhance the integration process of self-adaptive were taken, with comparisons with the PCA transformation, IHS transfor-mation and other traditional methods by subjective and the corresponding quantita-tive evaluation. Furthermore, the research extracted the bands and NDVI values around the fusion with GPS samples, analyzed and explained the fusion effect. The results showed that the spectral distortion of wavelet fusion, IHS transform, PCA transform images was 0.101 6, 0.326 1 and 1.277 2, respectively and entropy was 14.701 5, 11.899 3 and 13.229 3, respectively, the wavelet fusion is the highest. The method of wavelet maintained good spectral capability, and visual effects while improved the spatial resolution, the information interpretation effect was much better than other two methods. 展开更多
关键词 Spectral characteristics Data fusion SAR Multi-spectral image Wavelet transform
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Suppression of mitochondrial energy production by a photosynthetic bacterial cupredoxin peptide inhibits tumor growth 认领 引用
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作者 Samer A.Naffouje Duy Binh Tran +9 位作者 David J.Rademacher Valentina Botti Konstantin Christov Albert Green Weiguo Li Ngoc Hai Trieu Phong Salvatore Cannistraro Anna Rita Bizzarri Tapas K.Das Gupta Tohru Yamada 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2026年第5期2835-2850,共16页
Accumulating evidence shows that bacteria influence cancer homeostasis,yet the effects of tumor‑associated microbes and their products remain largely unexplored.We previously reported that P.aeruginosa–cancer crossta... Accumulating evidence shows that bacteria influence cancer homeostasis,yet the effects of tumor‑associated microbes and their products remain largely unexplored.We previously reported that P.aeruginosa–cancer crosstalk suppresses tumors via the bacterial cupredoxin azurin,and we developed an azurin‑derived peptide that was tested in clinical trials.Building on our previous studies,we studied tumor-resident bacteria for novel therapeutics and targets.Photosynthetic bacteria from the phylum Chloroflexota,including a member of the class Chloroflexia,identified in tumors,carry the cupredoxin auracyanin gene.Based on the structural and chemical characteristics of auracyanin,we designed a novel cell-penetrating peptide,aurB.Plant chloroplasts are thought to have evolved from a bacterial endosymbiont,and both chloroplasts and mitochondria possess shared proteins essential for ATP-dependent energy production,indicating that these bacterial-derived proteins may influence mitochondrial function.Consistent with this model,we demonstrated that aurB,a peptide from cupredoxin auracyanin B,localized at mitochondria,blocked energy production by targeting ATP synthase in prostate cancer cells,thereby significantly inhibiting tumor growth.More strikingly,combination treatment with aurB and radiation therapy significantly inhibited tumor growth in a tibial bone metastasis model.Moreover,the number of metastatic lesions in the lungs was also significantly lower upon aurB treatment.Multiplex RNA-expression profiling revealed that the inhibition of ATP production by aurB increased the efficacy of radiation therapy by modulating multiple pathways involving HIF-1α.Our findings indicate that electron transfer proteins could represent an important source of promising novel peptide-based agents that target the aberrantly activated mitochondrial energy system in cancer. 展开更多
关键词 Auracyanin tumor associated microbes Aurb peptide cancer homeostasis tumor growth azurin derived peptide mitochondrial energy production suppresses tumors
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