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Influence of texture distribution in magnesium welds on their non-uniform mechanical behavior:A CPFEM study

Journal of Materials Science & Technology 2020年第11期42卷 168-176页

作者： Weijie Ren Dejia Liu Qing Liu Renlong Xin Joint International Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China College of Materials Science and Engineering East China Jiaotong UniversityNanchang3300J3China Key Laboratory for Light-weight Materials NanjingTech UniversityNanjing211816China

Recent studies indicate that the texture distribution in friction stir welded(FSW)Mg alloys can be tailored and hence improve the joint *** this work,a crystal plasticity finite element modeling(CPFEM)was performed to understand the effects of texture distribution in stir zone(SZ)on the nonuniform plastic deformation and fracture *** total,six kinds of observed or purposely tilted texture distributions were ***"concave-convex"appearance,as commonly observed in the tensile sample,was successfully *** reveals that the mirror-symmetrical distribution of basal planes in the region of easy to activate basal slip(EABS)determined the"concave-convex"appearance in *** asymmetrical appearance exchanged on plane A and plane B when the directions of basal planes were switched in the two EABS ***,the asymmetrical feature of plastic deformation was changed with varying the texture distribution in ***"embossed"feature became more obvious in SZ-center first,and then gradually weakened with the c-axis rotated away from the weld plate *** necking was successfully simulated in SZ-center of FSW-H joint and in SZ-side of FSW-L *** might determine the observed fracture *** believe that this simulation study is helpful for further improving the performance of FSW Mg joints.

关键词： Friction stir welding Magnesium alloy CPFEM non-uniform deformation Fracture

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Clamped-end effect on static detection signals of DNA-microcantilever

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Applied Mathematics and Mechanics(English Edition) 2021年第10期42卷 1423-1438页

作者： Junzheng WU Nenghui ZHANG Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

Boundary constraint induced inhomogeneous effects are important for mechanical responses of nano/*** microcantilever sensors,the clamped-end constraint induced inhomogeneous effect of static deformation,so called the clamped-end effect,has great influence on the detection *** paper is devoted to developing an alternative mechanical model to characterize the clamped-end effect on the static detection signals of the *** from the previous concentrated load models,the DNA adsorption is taken as an equivalent uniformly distributed tangential load on the substrate upper surface,which exactly satisfies the zero force boundary condition at the ***,a variable coefficient differential governing equation describing the non-uniform deformation of the DNA-microcantilever induced by the clamped-end constraint is established by using the principle of minimum potential *** reducing the order of the governing equation,the analytical solutions of the curvature distribution and static bending deflection are *** comparing with the previous approximate surface stress models,the clamped-end effect on the static deflection signals is discussed,and the importance of the neutral axis shift effect is also illustrated for the asymmetric laminated microcantilever.

关键词： surface stress DNA adsorption microcantilever biosensor static deflection clamped-end effect non-uniform deformation

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Physical model test and application of 3D printing rock-like specimens to laminated rock tunnels

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4625-4637页

作者： Yun Tian Weizhong Chen Hongming Tian Xiaoyun Shu Linkai He Man Huang School of Civil Engineering Shaoxing UniversityShaoxing312000China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing312000China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China College of Civil and Transportation Engineering Hohai UniversityNanjing210024China

Weak structural plane deformation is responsible for the non-uniform large deformation disasters in layered rock tunnels,resulting in steel arch distortion and secondary lining *** this study,a servo biaxial testing system was employed to conduct physical modeling tests on layered rock tunnels with bedding planes of varying dip *** influence of structural anisotropy in layered rocks on the micro displacement and strain field of surrounding rocks was analyzed using digital image correlation(DIC)*** spatiotemporal evolution of non-uniform deformation of surrounding rocks was investigated,and numerical simulation was performed to verify the experimental *** findings indicate that the displacement and strain field of the surrounding layered rocks are all maximized at the horizontal bedding planes and decrease linearly with the increasing dip *** failure of the layered surrounding rock with different dip angles occurs and extends along the bedding *** strain failure occurs after excavation under high horizontal *** study provides significant theoretical support for the analysis,prediction,and control of non-uniform deformation of tunnel surrounding rocks.

关键词： Bedding plane Three-dimensional(3D)printing Physical model test non-uniform deformation Digital imaging correlation(DIC)

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