当材料的形变超出弹性形变发生的范围，其应力将不再与应变成正比，永久的、不可回复的形变发生，即为塑性形变。
As the material is deformed beyond the strain that elastic deformation persists, the stress is no longer proportional to strain, and permanent, nonrecoverable, or plastic deformation occurs.
首先在小弹塑性范围内用应变的奇次四项式相当精确地拟合一般硬化材料的拉伸曲线；
This paper pressents a polynomial with four odd terms to fit the stress-strain relation for the materials with arbitrary hardening behaviour in the region of small elastoplastic deformation.
同时对比了在四种不同组合时，应力、应变的分布，塑性区范围的大小。
Comparison of four different combinations of the same time, the stress and strain distribution, the size of the plastic zone.
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.
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.
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