In the article, a simple method is discussed to confirm the principal stress direction un-den the plane stress condition.
文章给出了一种判断平面应力状态主应力方向的简便方法。
Although the expressional form of damage evolution equation in complicated stress condition is the same as that in simple load condition, the influence factors are different of the damage parameters.
复杂应力条件下的黄土损伤演化方程的表现形式与简单加载条件下的完全相同，区别只是在于损伤参量的影响因素不同。
A micron electro-mechanical system was designed by using simple and cheap structure. The system can be used to measure the internal stress of concrete on the condition of being constrained.
该文利用简单廉价的机电结构实现了微米级的机电一体化系统的设计，该系统可用于在约束条件下测量混凝土的内应力。
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