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。
Most of the existing models for borehole wall stress are based on plane strain hypothesis. So some errors may be generated as compared with the real stress state of rock.
现有井壁围岩应力求解模型大都基于平面应变假设，相对岩石真实应力状态会有一定的误差。
The relationship between principal stresses in the plane strain state is the stress-strain relationship of soil with a certain strain path.
平面应变条件下土体中主应力之间的关系，其实质是特定应变路径条件下土的应力–应变关系，为土的一个重要力学特性。
The relationship between principal stresses in the plane strain state is the stress-strain relationship of soil with a certain strain path.
平面应变条件下土体中主应力之间的关系，其实质是特定应变路径条件下土的应力–应变关系，为土的一个重要力学特性。
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