材料刚度，刚度是指物体抵抗变形的能力。
同时分析了材料刚度衰减对疲劳裂纹扩展速率和扩展长度的影响。
The impact of the material constant and the degradation of elastic modulus are analyzed.
如果日后由于材料刚度的需要要求改变材料厚度，可能导致要将阳模转换为阴模。
If the day after due to the stiffness of the material required to change the material thickness, may lead to male into female die.
为了探讨变密度法中伪密度的变化对材料刚度的影响，并建立两者之间的力学关系，本文采用有限元法研究这一问题。
In order to explore the change of pseudo-density to the effect of material rigidity and set up the relation between them for density variable method, we presented FEM to deal with the problem.
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