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elastoplastic behavior of frozen sand-concrete interfaces under cyclic shear loading

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第9期23卷 683-703页

作者： Jian CHANG Jian-kun LIU Ya-li LI Qi WANG Zhong-hua HAO School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China School of Civil Engineering Sun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

The resilient modulus,accumulated plastic strain,peak shear stress,and critical shear stress are the elastoplastic behaviors of frozen sand–concrete interfaces under cyclic shear *** reflect the bearing capacity of buildings(*** railways)in both seasonal frozen and permafrost *** study describes a series of direct shear experiments conducted on frozen sand–concrete *** results indicated that the elastoplastic behaviors of frozen sand–concrete interfaces,including the resilient modulus,accumulated plastic strain,and shear strength,are influenced by the boundary conditions(constant normal loading and constant normal height),initial normal stress,negative temperature,and cyclic-loading *** resilient modulus was significantly correlated with the initial normal stress and negative temperature,but not with the cyclic-loading amplitude and loading *** accumulated plastic shear strain increased when the initial normal stress and cyclic-loading amplitude increased and the temperature ***,the accumulated plastic shear strain increment decreased when the loading cycles *** accumulated direction also varied with changes in the initial normal stress,negative temperature,and cyclic-loading *** peak shear stress of the frozen sand–concrete interface was affected by the initial normal stress,negative temperature,cyclic-loading amplitude,and boundary ***,a correlation was observed between the critical shear stress and the initial normal stress and boundary *** peak shear stress was higher,and the critical shear stress was lower under the constant normal height boundary *** on the results,it appears that the properties of frozen sand–concrete interfaces,including plastic deformation properties and stress strength properties,are influenced by cyclic shear *** results provide valuable information for the investigation of constitutive models of f

关键词： Frozen sand-concrete interface Cyclic direct shear test elastoplastic behavior Direction of accumulated plastic strain Boundary condition

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elastoplastic analysis of AA7075-O aluminum sheet by hybrid micro-scale representative volume element modeling with really-distributed particles and in-situ SEM experimental testing

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Journal of Materials Science & Technology 2022年第28期123卷 201-221页

作者： Qingping Sun Shahryar Asqardoust Abhishek Sarmah Mukesh K.Jain College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China Department of Mechanical Engineering McMaster UniversityHamiltonON L8S4L7Canada

This paper addresses the challenge of reconstructing randomly distributed second-phase particlestrengthened microstructure of AA7075-O aluminum sheet material for computational *** particle characteristics in 3D space were obtained from focused ion beam and scanning electron microscopy(FIB-SEM)and SEM-based Electron Backscatter Diffraction/Energy Dispersive X-ray Spectrometry(EBSD/EDS)techniques.A theoretical framework for analysis of elastic-plastic deformation of such3D microstructures is ***-induced shear band formation,void initiation,growth and linkage at large plastic strains during uniaxial tensile loading were investigated based on reconstructed 3D representative volume element(RVE)models with real-distribution of particles and the results compared with experimental ***-situ SEM interrupted tension tests along transverse direction(TD)and rolling direction(RD),employing microscopic-digital image correlation(μ-DIC)technique,were carried out to investigate slip bands,micro-voids formation and obtain microstructural strain *** resulting local strain maps were analyzed in relation to the experimentally observed plastic flow localization,failure modes and local stress maps from simulations of RVE *** influences of particle size,shape,orientation,volume fraction as well as matrix-particle interface properties on local plastic deformation,global stress-strain/strain-hardening curves and interfacial failure mechanisms were studied based on 3D RVE *** possible,the model results were compared with in-situ tensile test *** general,good agreement was observed,indicating that the real 3D microstructure-based RVE models can accurately predict the plastic deformation and interfacial failure evolution in AA7075-O aluminum sheet.

关键词： Representative volume element AA7075-O aluminum sheet In-situ SEM Microscopic-digital image correlation(μ-DIC) elastoplastic behavior

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Propagation of combined longitudinal and torsional stress waves in a functionally graded thin-walled tube

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Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1717-1732页

作者： Shitang CUI Xiaojun NI CAS Key Laboratory of Mechanical behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

An analytical model for the propagation of combined stress waves in a functionally graded thin-walled tube subjected to combined longitudinal and torsional impact loading is *** material properties of the tube are assumed to be continuously graded along the length according to a power law function with respect to the volume fractions of the *** generalized characteristic theory is used to analyze the main features of the characteristic wave speeds and simple wave solutions in the functionally graded thin-walled *** finite difference method is used to discretize the governing *** types of typical solutions are obtained for the functionally graded tube and the homogeneous tube subjected to combined longitudinal and torsional step *** numerical results reveal some abnormal phenomena in the stress path and wave process of the functionally graded thin-walled tube.

关键词： elastoplastic behavior combined stress wave finite difference scheme thinwalled tube

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Influence of Inclusion Shape on Thermoelasto-Plastic Optimun Design of Ceramic Metal Functionally Graded Materials

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Journal of Wuhan University of Technology(Materials Science) 2001年第1期16卷 19-24,29页

作者：王继辉 State Key Lab. Mat. Synthesis/Proc. Wuhan University of Technology Wuhan 430070 China

A nonlinear finite element method is applied to observe how inclusion shape influence the thermal response of a ceramic-metal functionally graded material (FGM). The elastic and plastic behaviors of the layers which are two-phase isotropic composites consisting of randomly oriented elastic spheroidal Inclusions and a ductile matrix are predicted by cc mean field method. The prediction results show that inclusion shape has remarkable influence on the overall behavior of the composite. The consequences of the thermal response analysis of the FGM are that the response is dependent on inclusion shape and its composition profile cooperatively and that the plastic behavior of each layer should be taken into account in optimum design of a ceramic-metal FGM.

关键词： inclusion shape ceramic-metal functionally graded material mean field method elastoplastic behavior

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Unified description of different soils based on the superloading and subloading concepts

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 239-254页

作者： Yong Lu Yu Jiang Wenxuan Zhu Yuanfeng Bao Guanlin Ye Feng Zhang Department of Civil Engineering Suzhou University of Science and TechnologySuzhou215011China Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai200240China Suzhou Integrated Infrastructure Technology Research Institute(SITRI) Suzhou215000China Department of Civil Engineering Nagoya Institute of TechnologyNagoya466-8555Japan

Geotechnical engineering often involves different types of geomaterials,such as sandy soil and clayey *** studies have confirmed that these soils have some common features,*** mechanical behaviors depend not only on the inherent characteristics but also on their initial *** describe the main mechanical behaviors of different soils within a simple and reasonable constitutive framework is of great significance for the numerical analysis on geotechnical *** paper first introduces a model based on the concepts of superloading and subloading,which considers the“state dependence”(effects of overconsolidation and structure)of soil and only adds two material parameters compared with the Cam-Clay ***,conventional triaxial tests are systematically carried out on four types of soils(***,silty clay,clay,and intermediate soil)with different initial void ratios,and the mechanical similarities and differences of these soils are discussed *** that,six material parameters of these soils are uniformly determined based on the concepts of superloading and subloading,and then used in constitutive calculations to verify the *** calculated results show a good agreement with test data,indicating that the model based on the concepts of superloading and subloading has great potential for describing the general mechanical behaviors of different soils within a unified *** work is expected to be applied to constitutive selection and parameter determination in the geotechnical numerical analysis of complex soil profiles.

关键词： elastoplastic behavior Constitutive model Sand Clay State dependence

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