| 材料微损伤在高速变形过程中的演化及其对率型本构关系的影响 |
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| 引用本文： | 王礼立,蒋昭镳,陈江瑛. 材料微损伤在高速变形过程中的演化及其对率型本构关系的影响[J]. 宁波大学学报(理工版), 1996, 0(3) |
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| 作者姓名： | 王礼立 蒋昭镳 陈江瑛 |
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| 作者单位： | 宁波大学力学和材料科学研究中心，中国科学技术大学近代力学系 |
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| 摘 要： | 材料在高速变形过程中常常伴有不同形式的内部缺陷或微损伤的演化。根据锆合金中孪晶演化，钛合金中绝热剪切带演化，以及铸镁合金、有机玻璃和水泥砂浆中微裂纹演化的实验观察，基于热激活机制，提出了同时依赖于应变率和应变的微损伤演化律，及相应的计及损伤弱化效应的率型本构关系。
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| 关 键 词： | 材料，高应变率，损伤演化，本构关系 |
MICRO-DAMAGE EVOLUTION IN HIGH VELOCITY DEFORMATION AND ITS INFLUENCE ON RATE-DEPENDENT CONSTITUTIVE RELATION OF MATERIALS |
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| Wang Lili, Jiang Zhaobiao, Chen Jiangying. MICRO-DAMAGE EVOLUTION IN HIGH VELOCITY DEFORMATION AND ITS INFLUENCE ON RATE-DEPENDENT CONSTITUTIVE RELATION OF MATERIALS[J]. Journal of Ningbo University(Natural Science and Engineering Edition), 1996, 0(3) |
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| Authors: | Wang Lili Jiang Zhaobiao Chen Jiangying |
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| Abstract: | t was observed that the evolution of internal defects or micro-damages are usually accompanied with high velocity deformation of materials. According to the experimental observation of the twinning evolution in Zircaloy-4, the adiabatic shear banding evolution in Titanium alloy and the micro-cracks evolution in cast magnesium alloy, PMMA and cement mortar, a micro-damage evolution law, which depends on both strain-rate and strsin, is suggested on the basis of thermo-activated mechanism. Correspondingly, a damage-modified rate-dependent constitutive relation,taking account of damage-weakening effects, is given and discussed. |
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| Keywords: | material high strain-rates damage evolution constitutive relation |
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