| 单元类型和尺寸对裂尖疲劳塑性数值模拟的影响研究 |
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| 引用本文： | 赵丹,冯淼林,吴长春.单元类型和尺寸对裂尖疲劳塑性数值模拟的影响研究[J].上海力学,2008,29(3). |
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| 作者姓名： | 赵丹 冯淼林 吴长春 |
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| 作者单位： | 上海交通大学工程力学系,上海200240 |
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| 摘 要： | 本文采用Jiang-Sehitoglu循环塑性模型和多轴疲劳准则对紧凑拉伸式样裂尖的循环塑性变形、裂纹扩展速率和残余应力进行了有限元数值模拟,着重考察了单元的类型和最小单元尺寸对裂尖循环塑性和裂纹扩展速率的影响.紧凑拉伸试样的材料为1070钢,数值模拟采用了线性单元(四节点)和二次单元(八节点)两种单元,裂尖附近有限元单元的最小尺寸从0.007mm到0.24mm不等.文中将裂纹扩展速率的预测值与实验值进行了比较,通过对裂纹扩展速率的比较,确定在疲劳塑性分析时对单元类型和尺寸进行合理选取.
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| 关 键 词： | 塑性模型 多轴疲劳准则 裂纹扩展 塑性变形 残余应力 |
Influence of Element Type and Size on Finite Element Prediction of Crack Tip Plasticity |
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| ZHAO Dan FENG Miao-lin WU Chang-chun.Influence of Element Type and Size on Finite Element Prediction of Crack Tip Plasticity[J].Chinese Quarterly Mechanics,2008,29(3). |
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| Authors: | ZHAO Dan FENG Miao-lin WU Chang-chun |
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| Institution: | Department of Engineering Mechanics;Shanghai Jiaotong University;Shanghai 200240;China |
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| Abstract: | The Jiang and Sehitoglu cyclic plasticity model combined with the multiaxial fatigue criterion was implemented into the finite element elastic-plastic stress analysis for the simulations of cyclic plas- ticity,crack growth and residual stress near the crack tip in a plane-stress compact specimen.The influ- ence of element type and element size on the predicted cyclic plasticity near the crack tip and crack growth was studied.Material 1070 steel was used in the investigation.There are four node bilinear and ... |
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| Keywords: | cyclic plasticity model multiaxial fatigue criterion crack growth plastic deformation residual stress |
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