ANSYS Mechanical 结构非线性基础 - 率无关塑性.pdf

率无关塑性 Rate Independent Plasticity ANSYS Mechanical 结构非线性基础 1 July 10, 2019 主题Topics 1. 弹塑性简介 Background on Elasticity and Plasticity 2. 屈服准则Yield Criteria 3. 流动准则 Flow Rule 4. 强化准则 Hardening Rules 5. 材料属性输入 Material Data Input 6. 分析设置Analysis Settings 7. 查看结果 Reviewing Results 8. 总结Summary 9. 算例：金属塑性Workshop: Metal Plasticity 2 July 10, 2019 01 弹塑性简介Background Elasticity/Plasticity 弹性简介：Review of Elasticity: 在介绍塑性之前，先简要介绍金属弹性。Before proceeding to a discussion on plasticity, it may be useful to review elasticity of metals. • 在弹性响应中，如果应力小于屈服强度，在卸载之后材料可以完全恢复其原始形状。 In elastic response, if the induced stresses are below the material’s yield strength, the material can fully recover its original shape upon unloading. • 以金属为例，这种行为的原因是原子间化学键的拉伸，而不是破坏。由于弹性是由原 子键的拉伸产生的，所以可以完全恢复。这种弹性应变一般比较小。From a standpoint of metals, this behavior is due to the stretching but not breaking of chemical bonds between atoms. Because elasticity is due to this stretching of atomic bonds, it is fully recoverable. Moreover, these elastic strains tend to be small. • 金属的弹性通常情况下使用应力-应变之间的胡克定律表达：Elastic behavior of metals is most commonly described by the stress-strain relationship of Hooke’s Law:  E 3 July 10, 2019 01 弹塑性简介Background Elasticity/Plasticity 什么是塑性？ What is plasticity? 当