柯西应力与真实应力？
请问ADINA中柯西应力是否就是真实应力？另为真实应力与工程应力之间的转化公式？谢谢！
Stress is a tensor which is configuration-dependent. Cauchy stress is also called true stress. Cauchy stress and engineering stress are related by deformation gradient.
Consider a bar subject to axial tension force. Now we want to know the stress in the bar. The stress can be determined by the force divided by the cross-section area. Are we going to use the cross-section area before the deformation or the one after the deformation? The former leads us to the engineering stress while the later to the Cauchy stress. If the deformation of the cross-section area is small, there is no difference between the two. Otherwise, there is difference. In nonlinear analysis which involves large strain, Cauchy stress is the quantity that we should get from the engineering point of view. 大家能否帮忙翻译一下。谢谢了 大家能否帮忙翻译一下。谢谢了
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