如不成立，那么，玻璃材料在双轴应力状态下的裂纹扩展由什么参数决定？
If not existing any more, then what is the parameter of crack extending when glass in biaxial stress state?
等双轴应力较单轴应力状态下的裂纹扩展速率减慢，而纯剪切状态下的裂纹扩展速率加快。
In these areas, they were slower in equibiaxial case and faster in pure shear compared to crack growth rates in uniaxial loading.
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