In this paper,we exemplify some applications of energy principles,compare the potential energy principle and complementary energy principle and clarify th.

• 线弹性体中的势能原理和余能原理,只适用于物体或结构在给定约束条件下处于稳定平衡状态情况,而在一般情况下动力学问题不可能存在稳定平衡状态。