There are two main methods to describe the general state of stress at a point in Continuum Mechanics-Qudric Surface method and Ellipsoid method.
连续介质力学中关于一点应力状态的描述有多种方法：如二次曲面法和应力椭球法。
2
An anisotropic damage model for concrete subjected to compressive fatigue load is developed based on continuum damage mechanics and the concept of boundary surface.
基于边界面概念和损伤力学理论，建立了混凝土受压各向异性损伤模型。
3
The freezing mechanics, characteristic and influence on structure of plasma-jet surface metallurgy have been analyzed in full.