本文介绍了力学中的一个新概念机械能流，研究了能流中的应力张量，并讨论了动力学系统中机械能密度守恒点的一个应用。

This paper introduces a new concept-mechanical energy flow, studies stress tensor in energy flow and an application of mechanical energy density conservative points in dynamical systems is discussed.

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推导出损伤应变能释放率张量。

A release rate tensor of damage strain energy is derived.

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推导出损伤应变能释放率张量。

A release rate tensor of damage strain energy is derived.

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