以库仑定律作为强度破坏准则，破碎区边界上的弹性介质和它内部的塑性介质的破坏条件分别采用了不同的主应力函数。
Different functions for principal stress were used as elastic medium failure conditions at the boundary with the crushing zone and plasticity within the latter based on Coulomb rule.
在小弹塑性变形范围内，首先将应力写成应变的奇次四项式的幂函数形式。使其相当精确地拟合材料的拉伸曲线。
This paper presents the odd function with four terms which can be used to make the curve fitting of the stress-strain for various materials precisely.
高温下的材料流动应力通常是应变总量、温度和应变速率的函数，考虑这三个因素对流动应力的影响，建立了高温硬化材料的弹塑性本构关系矩。
The present work takes account of the above influence factors on the flow stress and derives a constitutive matrix for the hot deforming materials.
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