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Modelling of spall damage in ductile materials and its application to the simulation of the plate impact on copper

Chinese Physics B 2012年第9期21卷 378-384页

作者：张凤国周洪强胡军邵建立张广财洪滔何斌 Institute of Applied Physics and Computational Mathematics

A statistical model of dynamic spall damage due to void nucleation and growth is proposed for ductile materials under intense loading, which takes into account inertia, the elastic-plastic effect, and initial void size. To some extent, void interaction could be accounted for in this approach. Based on this model, the simulation of spall experiments for copper is performed by using the Lagrangian finite element method. The simulation results are in good agreement with experimental data for the free surface velocity profile, stress record behind copper target, final porosity, and void concentrations across the target. The influence of elastic-plastic effect upon the damage evolution is explored. The correlation between the damage evolution and the history of the stress near the spall plane is also analyzed.

关键词： spall damage ductile materials free surface velocity plate impact

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EXPERIMENTAL STUDY OF MICROHOLE GROWTH AND COALFSCENCE IN ductile materials

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Acta Mechanica Solida Sinica 1999年第3期12卷 220-226页

作者： Bai Shulin Ni Shouyong Fang Jing (Department of Mechanics and Engineering Science,Peking University,Beijing 100871,China)

The growth and coalescence of two microholes in copper foil were studied experimental ly by in situ tensile tests under a,scanning electronic *** microholes of 15-35μm in di- ameter were arranged in different distances and *** was found that the mechanisms of mi crohole evolution were represented by slipping band creation,and then crack initiation and propagation along the slipping bands,in *** process of microhole growth and coalescence was influenced by the inter-center distance and orientation of *** critical surface of microholes at coales- cence is about 2—2.5 times that of the initial *** variation of both the inter center distance and orientation depends on the initial angle.

关键词： microholes growth and coalescence experimental study ductile materials

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Study on large plastic deformation of ductile materials based on finite element aided testing method

Study on large plastic deformation of ductile materials base...

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2014海峡两岸破坏科学与材料试验学术会议暨第十二届破坏科学研讨会/第十届全国MTS材料试验学术会议

作者： Di Yao Lixun Cai Chen Bao Shuang Qi School of Mechanics and Engineering Southwest Jiaotong University

The most important relationship to study the large deformation behaviors of ductile materials,such as necking in tension,distention in compression and fracture,is the uniaxial full-range constitutive *** on a finite element aided testing(FAT)method,the full-range constitutive relationships of ductile materials are *** true stress-true strain curve from necking to failure is obtained by a funnel-shaped ***,the true stress-true strain curve is used as the mutilinear constitutive relationship model in finite element *** large deformation behaviors of ductile materials are *** the simulating results to the testing results by DIC optical testing system,the simulating deformation characteristic curves,such as load-displacement curve,the diameter at the funnel root versus displacement curve and the funnel deformation outlines are closed to the testing *** the FAT method is applied on different materials,working temperature,loading modes and groups of *** on the accurate descriptions of the stress distribution on the cross section at the root of the necking zone,a mixed strength concept has been put forward to explain the failure mechanism of ductile materials under tensile *** FAT method has been successfully applied in the estimation of constitutive relationship under compression and the elongation of ductile materials.

关键词： Full-range constitutive relationship FAT method Large plastic deformation ductile materials

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An Elastoplastic Fracture Model Based on Bond-Based Peridynamics

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 2349-2371页

作者： Liping Zu Yaxun Liu Haoran Zhang Lisheng Liu Xin Lai Hai Mei Department of Engineering Structure and Mechanics Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced materials Mechanics Wuhan University of TechnologyWuhan430070China

Fracture in ductile materials often occurs in conjunction with plastic ***,in the bond-based peridynamic(BB-PD)theory,the classic mechanical stress is not defined *** makes it difficult to describe plasticity directly using the classical plastic *** address the above issue,a unified bond-based peridynamics model was proposed as an effective tool to solve elastoplastic fracture *** to the existing models,the proposed model directly describes the elastoplastic theory at the bond level without the need for additional calculation *** results obtained in the context of this model are shown to be consistent with FEM results in regard to force-displacement curves,displacement fields,stress fields,and plastic deformation *** model exhibits good capability of capturing crack propagation in ductile material failure problems.

关键词： ductile materials plastic deformation bond-based peridynamics isotropic hardening fracture analysis

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