不同屈服应力定义对初始屈服曲面的后继屈服曲面的影响；
The effect of the definition of yield stress on the initial and subsequent yield surfaces.
本文通过引入帽子屈服曲面，并对帽子曲面和塑性势能曲面用椭圆函数和圆函数形式进行了简化，从而得到了新的判定条件。
This article introduce the "cap yield curve model", simplify the cap yield surface and plastic potential energy surface by ellipse and circle, and get a new justify condition.
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