,二向应力状态（Plane State of Stress）： 一个主应力为零的应力状态。,,三向应力状态（ Three—Dimensional State of Stress）： 三个主应力都不为零的应力状态。
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The state space method coupled with the technique of differential quadrature (SSDQM) was presented for plane stress problems.
针对平面应力问题，提出了利用状态空间法和微分积分法的混合解法（SSDQM）。
The state equation of Pieoelectric beam is deduced directly from a piezoelectric physical equation in terms of a plane stress problem.
按平面应力问题，直接从压电物理方程出发，导出了压电梁的状态方程。
Based on the analytical formula of the plane stress state, a simple and direct distinguishing method is derived with regard to the direction in which the maximal extremes lie.
本文根据平面应力状态的解析式，推导出了一种判别最大应力极值所在方向的简捷方法。
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