结构局部刚度改变问题在结构有限元计算时常会遇到，例如：结构物个别构件的破坏或损伤，构件的局部屈服等等。
The problem often arrived when finite element analyses for the structure with a few components damaged or some elements yield, etc.
由于转子材料屈服点较低，在额定转速时，局部会出现塑性形变。
Because of the lower yield point of rotor material, the local plastic deformations are found during operation at rate speed.
这种失效的原因在这些局部可能是由于机械和热应力的双重作用超过了辊子自身的材质的抗屈服强度所导致的，并且在进一步冷却中还会进一步扩展。
These cracks occur when the combination of mechanical and thermal stresses within these local areas pass over the yield strength of the barrel material and are exaggerated during subsequent cooling.
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