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| 1 | Experimental Study on Uniaxial and Multiaxial Strain CyclicCharacteristics and Ratcheting of 316L Stainless Steel显示文摘An experimental study was carried out on the strain cyclic characteristics and ratcheting of 316L stainless steel subjected to uniaxial and multiaxial cyclic loading. The strain cyclic characteristics were researched under the strain-controlled uniaxial tension-compression and multiaxial circular paths of loading. The ratcheting tests were conducted for the stress-controlled uniaxial tensioncompression and multiaxial circular, rhombic and linear paths of loading with different mean stresses, stress amplitudes and histories. The experiment results show that 316L stainless steel features the cyclic hardening, and its strain cyclic characteristics depend on the strain amplitude and its history apparently. The ratcheting of 316L stainless steel depends greatly on the values of mean stress, stress amplitude and their histories. In the meantime, the shape of load path and its history also apparently influence the ratcheting. | GuoZheng KANG, Qing GAO, Lixun CAI, Xianjie YANG and Yafang SUN Department of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China | 2001 | Journal of Materials Science & Technology2001，17，2： | 8 |
| 2 | A Dynamic Micromechanical Constitutive Model for Frozen Soil under Impact Loading显示文摘By taking the frozen soil as a particle-reinforced composite material which consists of clay soil(i.e., the matrix) and ice particles, a micromechanical constitutive model is established to describe the dynamic compressive deformation of frozen soil. The proposed model is constructed by referring to the debonding damage theory of composite materials, and addresses the effects of strain rate and temperature on the dynamic compressive deformation of frozen soil. The proposed model is verified through comparison of the predictions with the corresponding dynamic experimental data of frozen soil obtained from the split Hopkinson pressure bar(SHPB) tests at different high strain rates and temperatures. It is shown that the predictions agree well with the experimental results. | Qijun Xie Zhiwu Zhu Guozheng Kang | 2016 | Acta Mechanica Solida Sinica2016，29，1： | 7 |
| 3 | SUPER-ELASTIC CONSTITUTIVE MODEL CONSIDERING PLASTICITY AND ITS FINITE ELEMENT IMPLEMENTATION显示文摘Based on the experimental results of super-elastic NiTi alloy,a three-dimensional super-elastic constitutive model including both of stress-induced martensite transformation and plasticity is constructed in a framework of general inelasticity.In the proposed model,transformation hardening,reverse transformation of stress-induced martensite,elastic mismatch between the austenite and martensite phases,and temperature-dependence of transformation stress and elastic modulus of each phase are considered.The plastic yielding of martensite occurred under high stress is addressed by a bilinear isotropic hardening rule.Drucker-Prager-typed transformation surfaces are employed to describe the asymmetric behavior of NiTi alloy in tension and compression.The prediction capability of the proposed model is verified by comparing the simulated results with the correspondent experimental ones.Based on backward Euler's integration,a new expression of consistent tangent modulus is derived.The proposed model is then implemented into a finite element package ABAQUS by user-subroutine UMAT.Finally,the validity of such implementation was verified by some numerical samples. | Qianhua Kan Guozheng Kang 1 Linmao Qian(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China) | 2010 | Acta Mechanica Solida Sinica2010，23，2： | 7 |
| 4 | ADVANCES IN TRANSFORMATION RATCHETING AND RATCHETING-FATIGUE INTERACTION OF NITI SHAPE MEMORY ALLOY显示文摘The accumulation of inelastic deformation occurring in NiTi shape memory alloy under the stress-controlled cyclic loading condition is named transformation ratcheting, since it is mainly caused by the solid-solid transformation from austenite to martensite phase and vice versa. The transformation ratcheting and its effect on the fatigue life (i.e., transformation-fatigue interaction) are key issues that should be addressed in order to assess the fatigue of NiTi shape memory alloy more accurately. In this paper, the advances in the studies on the transformation ratcheting and ratcheting-fatigue interaction of super-elastic NiTi shape memory alloy in recent years are reviewed: First, experimental observation of the uniaxial transformation ratcheting and ratcheting-fatigue interaction of super-elastic NiTi alloy under the stress-controlled cyclic loading conditions is treated, and the detrimental effect of transformation ratcheting on the fatigue life is addressed; Secondly, two types of cyclic constitutive models (i.e., a macroscopic phenomenological model and a micromechanical one based on crystal plasticity) constructed to describe the transformation ratcheting of super-elastic NiTi alloy are discussed; Furthermore, an energy-based failure model is provided and dealt with by comparing its predicted fatigue lives with experimental ones; Finally, some suggestions about future work are made. | Guozheng Kang | 2013 | Acta Mechanica Solida Sinica2013，26，3： | 7 |
| 5 | A macroscopic multi-mechanism based constitutive model for the thermo-mechanical cyclic degeneration of shape memory effect of NiTi shape memory alloy显示文摘A macroscopic based multi-mechanism constitutive model is constructed in the framework of irreversible thermodynamics to describe the degeneration of shape memory effect occurring in the thermo-mechanical cyclic deformation of NiTi shape memory alloys(SMAs). Three phases,austenite A, twinned martensite Mtand detwinned martensite M^d, as well as the phase transitions occurring between each pair of phases( A → M^t, M^t→ A, A → M^d,M^d→ A, and M^t→ M^d) are considered in the proposed model. Meanwhile, two kinds of inelastic deformation mechanisms, martensite transformation-induced plasticity and reorientation-induced plasticity, are used to explain the degeneration of shape memory effects of NiTi SMAs. The evolution equations of internal variables are proposed by attributing the degeneration of shape memory effect to the interaction between the three phases(A, M^t, and M^d) and plastic deformation. Finally, the capability of the proposed model is verified by comparing the predictions with the experimental results of NiTi SMAs. It is shown that the degeneration of shape memory effect and its dependence on the loading level can be reasonably described by the proposed model. | Chao Yu Guozheng Kang Qianhua Kan | 2017 | Acta Mechanica Sinica2017，33，3： | 6 |
| 6 | Experimental Study on Non-proportional Multiaxial Strain Cyclic Characteristics and Ratcheting of U71Mn Rail Steel显示文摘An experimental study was carried out on the strain cyclic characteristics and ratcheting of U71Mn rail steel subjected to non-proportional multiaxial cyclic loading. The strain cyclic characteristics were researched under the strain-controlled circular load path. The ratcheting was investigated for the stress-controlled multiaxial circular, elliptical and rhombic load paths with different mean stresses, stress amplitudes and their histories. The experiment shows that U71Mn rail steel features the cyclic non-hardening/softening, and its strain cyclic characteristics depend greatly on the strain amplitude but slightly on its history. However, the ratcheting of U71Mn rail steel depends greatly not only on the values of mean stress and stress amplitude, but also on their histories. In the meantime, the shape of load path and its history also apparently influence the ratcheting. The ratcheting changes with the different loading paths. | Guozheng KANG, Qing GAO, Lixun CAI, Yafang SUN and Xianjie YANGDepartment of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China | 2002 | Journal of Materials Science & Technology2002，18，1： | 5 |
| 7 | Pantograph-catenary electrical contact system of high-speed railways:recent progress,challenges,and outlooks显示文摘As the unique power entrance,the pantograph-catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train.Along with the fast development of high-speed railways all over the world,some commercialized lines are built for covering the remote places under harsh environment,especially in China;these environmental elements including wind,sand,rain,thunder,ice and snow need to be considered during the design of the pantograph-catenary system.The pantograph-catenary system includes the pantograph,the contact wire and the interface—pantograph slide.As the key component,this pantograph slide plays a critical role in reliable power transmission under dynamic condition.The fundamental material characteristics of the pantograph slide and contact wire such as electrical conductivity,impact resistance,wear resistance,etc.,directly determine the sliding electrical contact performance of the pantograph-catenary system;meanwhile,different detection methods of the pantograph-catenary system are crucial for the reliability of service and maintenance.In addition,the challenges brought from extreme operational conditions are discussed,taking the Sichuan-Tibet Railway currently under construction as a special example with the high-altitude climate.The outlook for developing the ultra-high-speed train equipped with the novel pantograph-catenary system which can address the harsher operational environment is also involved.This paper has provided a comprehensive review of the high-speed railway pantograph-catenary systems,including its progress,challenges,outlooks in the history and future. | Guangning Wu Keliang Dong Zhilei Xu Song Xiao Wenfu Wei Huan Chen Jie Li Zhanglin Huang Jingwei Li Guoqiang Gao Guozheng Kang Chuanjun Tu Xingyi Huang | 2022 | Railway Engineering Science2022，30，4： | 5 |
| 8 | Damage Tolerance Assessment of a Brake Unit Bracket for High-Speed Railway Welded Bogie Frames显示文摘The brake unit bracket of a bogie frame is an important load-carrying component, particularly under emergency start/stop conditions. Conventional infinite/safe life approaches provide an over-conservative recommendation for the allowable strength and lifetime, which hinders the lightweight design of modern railway vehicles. In this study, to ensure the reliability and durability of a brake unit bracket, an attempt was made to integrate the nominal stress method and an advanced damage tolerance method. First, a complex bogie frame was modelled using solid elements instead of plate and beam elements. A hot spot stress region on the bracket was found under an eight-stage load spectrum obtained from the Wuhan–Guangzhou high-speed railway line. Based on the probability of foreign damage, a semi-elliptical surface crack was then assumed for residual life assessment. The results obtained by the cumulative damage and damage tolerance methods show that the brake unit bracket can operate for over 30 years. Moreover, even if a 2-mm depth crack exists, the brake unit bracket can be safely operated for more than 2.27 years, with the hope that the crack can be detected in subsequent maintenance procedures. Finally, an appropriate safety margin was suggested which provides a basis for the life prediction and durability assessment of brake unit brackets of high-speed railways. | Bing Yang Hao Duan Shengchuan Wu Guozheng Kang | 2019 | Chinese Journal of Mechanical Engineering2019，32，4： | 5 |
| 9 | Review on structural fatigue of NiTi shape memory alloys:Pure mechanical and thermo-mechanical ones显示文摘Structural fatigue of Ni Ti shape memory alloys is a key issue that should be solved in order to promote their engineering applications and utilize their unique shape memory effect and super-elasticity more sufficiently. In this paper, the latest progresses made in experimental and theoretical analyses for the structural fatigue features of Ni Ti shape memory alloys are reviewed. First, macroscopic experimental observations to the pure mechanical and thermo-mechanical fatigue features of the alloys are summarized;then the state-of-arts in the mechanism analysis of fatigue rupture are addressed; further, advances in the construction of fatigue failure models are provided; finally, summary and future topics are outlined. | Guozheng Kang Di Song | 2015 | Theoretical & Applied Mechanics Letters2015，5，6： | 3 |
| 10 | Analytical model of friction behavior during polymer scratching with conical tip显示文摘To investigate the effects of the contact geometry, interfacial friction, and substrate recovery on the behavior of polymer scratching using a conical tip, an analytical model is proposed. The normal stress acting on the contact surface between the tip and the substrate is described as a function of the included angle θ, representing the angle between two planes across the axis of the conical tip, and the attack angle β, representing the angle between the conical surface and the substrate material surface. The effects of the rear contact geometry on the scratch friction between the tip and substrate, represented by recovery angle φ, owing to the instantaneous elastic recovery of the polymer substrate, are also introduced. Validated by the experimental and numerical results from the literature, the proposed analytical model can describe well the scratch coefficient of friction(SCOF), which is defined as the ratio of the tangential force to the normal force. Meaningful guidance is provided to understand the scratch friction behavior. | Chengkai JIANG Han JIANG Jianwei ZHANG Guozheng KANG | 2019 | Friction2019，7，5： | 3 |
| 11 | Review on fatigue life prediction models of welded joint显示文摘Fatigue assessment of welded joint is still far from being completely solved now,since many influencing factors coexist and some important ones should be considered in the developed life prediction models reasonably.Thus,such influencing factors of welded joint fatigue are firstly summarized in this work;and then,the existing life prediction models are reviewed from two aspects,i.e.,uniaxial and multiaxial ones;finally,significant conclusions of existing experimental and theoretical researches and some suggestions on improving the fatigue assessment of welded joints,especially for the low-cycle fatigue with the occurrence of ratchetting,are provided. | Guozheng Kang Huiliang Luo | 2020 | Acta Mechanica Sinica2020，36，3： | 3 |
| 12 | CRACK TIP PLASTICITY OF A THERMALLY LOADED PENNY-SHAPED CRACK IN AN INFINITE SPACE OF 1D QC显示文摘The present work is concerned with a penny-shaped Dugdale crack embedded in an infinite space of one-dimensional(1D) hexagonal quasicrystals and subjected to two identical axisymmetric temperature loadings on the upper and lower crack surfaces. Applying Dugdale hypothesis to thermo-elastic results, the extent of the plastic zone at the crack tip is determined.The normal stress outside the plastic zone and crack surface displacement are derived in terms of special functions. For a uniform loading case, the corresponding results are presented by simplifying the preceding results. Numerical calculations are carried out to show the influence of some parameters. | Xiangyu Li Peidong Li Guozheng Kang | 2015 | Acta Mechanica Solida Sinica2015，28，5： | 2 |
| 13 | Numerical simulation of microstrueture and strength prediction for short-fiber-reinforced metal-matrix composites显示文摘 | Jiang Xiaoyu Gao Qing Kang Guozheng | 1998 | Composites Science and Technology1998，58，： | 1 |
| 14 | Oliver–Pharr indentation method in determining elastic moduli of shape memory alloys—A phase transformable material显示文摘 | Qianhua Kan Wenyi Yan Guozheng Kang Qingping Sun | 2013 | Journal of the Mechanics and Physics of Solids2013，，： | 1 |
| 15 | Uniaxial cyclic ratcheting and plastic flow properties of SS304 stainless steel at room and elevated temperatures显示文摘 | Guozheng Kang Qing Gao Xianjie Yang | 2002 | Mechanics of Materials2002，，3： | 1 |
| 16 | A visco-plastic constitutive model for ratcheting of cyclically stable materials and its finite element implementation显示文摘 | Guozheng Kang | 2004 | Mechanics of Materials2004，36，： | 1 |
| 17 | Stress-based fatigue failure models for uniaxial ratchetting-fatigue interaction显示文摘 | Liu Yujie Kang Guozheng Gao Qing | 2008 | International Journal of Fatigue2008，30，： | 1 |
| 18 | A visco-plastic constitutive model for ratcheting of cyclically stable materials and its finite element implementation显示文摘 | KANG Guozheng | | 0，，： | 1 |
| 19 | Experimental study on the cyclic deformation and plastic flow of U71Mn rail steel显示文摘 | Kang Guozheng Gao Qing Yang Xianjie | 2002 | International Journal of Mechanical Sciences2002，44，： | 1 |
| 20 | Experimental Study on the Uniaxial Cyclic Deformation of 25CDV4.11 Steel显示文摘The strain cyclic characteristics and ratcheting behavior of 25CDV4.11 steel were studied by the experiments under uniaxial cyclic loading with relatively high cyclic number and at room temperature. The cyclic hardening/softening feature of the material was first observed under the uniaxial strain cycling with various strain amplitudes. Then, the ratcheting behavior of the material was researched in detail, and the effects of stress amplitude and mean stress on the ratcheting were discussed under uniaxial asymmetrical stress cycling. Comparing with the experimental results of SS316L stainless steel, it is concluded that the material exhibits remarkable cyclic softening feature, and then a special ratcheting behavior is caused. Some conclusions useful to establish corresponding constitutive model are obtained. | Guozheng KANG, Qianhua KAN and Juan ZHANGDepartment of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaProf., Ph.D., | 2005 | Journal of Materials Science & Technology2005，21，1： | 1 |
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