超过屈服点之后，材料会继续变形，但是因为材料开始屈服，应力会减小。
Beyond the yield point, the material will continue to deform, but with less stress than before, because the material has begun to yield.
屈服点是弹性变形区域到塑性变形区域之间曲线的过渡点。
The yield point represents the dividing line or transition from the elastic to the plastic region of the curve.
屈服点是弹性变形区域到塑性变形区域之间曲线的过渡点。
Shape Optimization of Transition Curve of Shoudle of Step-Shaped Shaft and Its Experimental Research;
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