...性力学中有关变形体的虚功原理，这时的虚功应包括外力虚功 δW 和内 力虚功 δU ， δ U 叫做虚应变能 ( virtual strain energy )。由于弹性体在变形过程中，内力是抵抗 变形所产生的，其方向总是与变形的方向相反，所以内力虚功取负。
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For the simulation accuracy of springback problem in sheet metal forming, the effect of punch virtual velocity and sheet virtual density on the sheet strain energy was studied in this paper.
针对板料成形回弹精度问题的数值模拟，从理论上分析了凸模虚拟速度和板料虚拟密度对薄板变形能的影响。
The effect of punch virtual velocity and sheet virtual density on the sheet strain energy was studied in this paper.
从理论上分析了凸模虚拟速度和板料虚拟密度对薄板变形能的影响。
The strain energy release rate of the crack propagation was calculated by using virtual crack closure technique, and fatigue life was forecasted.
采用虚拟裂纹闭合技术计算裂纹扩展的应变能释放率，并对裂纹扩展寿命进行计算。
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