为表述复合土钉支护增量应力释放引起增量位移的变形原理，文中引入了一种释放力。

The method was based on the conception that incremental relief of in-situ stress generated incremental displacement on the cutting face. A release force was employed to realize the idea.

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它与夸脱理论相结合，得到了在角点处的塑性增量应力应变关系，在角点上剪应力增量与剪应变增量间是单值确定的。

Then the increment stress - strain relation of plasticity on the corner of the yielding surface is presented by the Koiter theory which is connected with the above hardening function.

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采用塑性增量理论，建立了波纹管液压胀形的应力、应变数值计算方法，解决了波纹管液压胀形工艺的理论计算问题。

By plasticity increment theory, the stress strain numerical calculate methods of bellows bulge forming, solvers theory calculating problems of bellows bulge forming technology are put forward.

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