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Coupling effects of void size and void shape on the growth of prolate ellipsoidal microvoid

Acta Mechanica Sinica 2005年第3期21卷 272-277页

作者： Minsheng Huang Zhenhuan Li Cheng Wang Department of Mechanics Huazhong University of Science & Technology Wuhan 430074 China

The combined effects of void size and void shape on the void growth are studied by using the classical spectrum method. An infinite solid containing an isolated prolate spheroidal void is considered to depict the void shape effect and the Fleck-Hutchinson phenomenological strain gradient plasticity theory is employed to capture the size effects. It is found that the combined effects of void size and void shape are mainly controlled by the remote stress triaxiality. Based on this, a new size-dependent void growth model similar to the Rice-Tracey model is proposed and an important conclusion about the size-dependent void growth is drawn： the growth rate of the void with radius smaller than a critical radius rc may be ignored. It is interesting that rc. is a material constant independent of the initial void shape and the remote stress triaxiality.

关键词： void shape Size effect Strain gradient Stress triaxiality Microvoid

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A MICROSCOPIC DAMAGE MODEL CONSIDERING THE CHANGE OF void shape AND APPLICATION IN THE void CLOSING

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Applied Mathematics and Mechanics(English Edition) 1992年第8期13卷 755-762页

作者：朱明金泉林 Laboratory for Nonlinear Mechanics of Continuous Media Institute of Mechanics Chinese Academy of Sciences Beijing

A microscopic damage model of ellipsoidal body containing ellipsoidal void for nonlinear matrix materials is developed under a particular coordinate. The change of void shape is considered in this model. The viscous restrained equation obtained from the model is affected by stress ?ij, void volume fraction f, material strain rate exponent m as well as the void shape. Gurson's equation is modified from the numerical solution. The modified equation is suitable for the case of nonlinear matrix materials and changeable voids. Lastly, the model is used to analyze the closing process of voids.

关键词： nonlinear material ellipsoidal void void shape void closing

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Influence of voids on interlaminar shear strength of carbon/epoxy fabric laminates

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Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 470-475页

作者： ZHU Hong-yan LI Di-hong ZHANG Dong-xing WU Bao-chang CHEN Yu-yong School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Harbin Aircraft Industry Co. Ltd.Harbin 150060China

The effects of voids(void content,void shape and size)on the interlaminar shear strength of[(±45)_(4)/(0,90)/(±45)_(2)]_(S) and [(±45)/0_(4)/(0,90)/0_(2)]_(S) composite laminates were *** with void contents in the range of 0.2%-8.0%for [(±45)_(4)/(0,90)/(±45)_(2)]_(S) and 0.2%-6.1%for[(±45)/0_(4)/(0,90)/0_(2)]_(S) were fabricated from carbon/epoxy fabric through varying autoclave *** characteristics of the voids were studied by using optical image analysis to explain the interlaminar shear strength *** influences of voids on the interlaminar shear strength of the two stacking sequences were compared in terms of the void content and size and shape of the *** effect of voids on the initiation and propagation of interlaminar failure of both stacking sequence composites was found.

关键词： carbon fibre reinforced polymer(CFRP)composite void content void size void shape interlaminar shears strength

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