| 直通型CT试样COD弹塑性换算 |
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| 引用本文： | 包陈,蔡力勋,石凯凯.直通型CT试样COD弹塑性换算[J].北京科技大学学报,2011(7):863-867. |
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| 作者姓名： | 包陈 蔡力勋 石凯凯 |
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| 作者单位： | 西南交通大学力学与工程学院; |
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| 基金项目： | 国家自然科学基金资助项目(No.11072205) |
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| 摘 要： | 基于刚性转动假设和功等效原理,推导了直通型CT试样的裂纹嘴张开位移和加载线张开位移弹塑性换算公式,并采用Cr2Ni2MoV钢对公式进行试验验证.根据弹塑性有限元分析,刚性转动假设得到了很好的验证,刚性转动中心靠近裂尖位置且受材料本构关系的影响甚微,转动半径R仅与裂纹长度和试样宽度之比a/W有关.有限元分析和试验结果表明,直通型CT试样的COD弹塑性换算公式用于塑性功计算具有更好的精度.
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| 关 键 词： | 断裂力学 断裂韧性 韧性断裂 塑性变形 有限元法 |
COD elastic-plastic transform formula for straight-notched CT specimens |
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| BAO Chen,CAI Li-xun,SHI Kai-kai School of Mechanics , Engineering,Southwest Jiaotong University,Chengdu ,China.COD elastic-plastic transform formula for straight-notched CT specimens[J].Journal of University of Science and Technology Beijing,2011(7):863-867. |
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| Authors: | BAO Chen CAI Li-xun SHI Kai-kai School of Mechanics Engineering Southwest Jiaotong University Chengdu China |
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| Institution: | BAO Chen,CAI Li-xun,SHI Kai-kai School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China |
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| Abstract: | A elastic-plastic transform formula between crack mouth opening displacement and loading-line crack opening displacement(COD) for straight-notched compact tension(CT) specimens was deduced on the basis of the rigid rotation hypothesis and the work equivalence principle.Cr2Ni2MoV steel was employed to verify the validity of this formula experimentally.As a result of elastic-plastic finite element analysis,the rigid rotation assumption is completely proved.The rotation center of a straight-notched CT specimen... |
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| Keywords: | fracture mechanics fracture toughness ductile fracture plastic deformation finite element method |
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