运用有限应变理论，可以将球孔扩张塑性区内的平均体积应变以解析方法导出，方便了数值化计算。
By incorporating the theory of finite strain, the model is capable of evaluating the mean volumetric strain analytically, thus facilitating the procedure of numerical calculation.
分析了剪胀和软化程度对球孔扩张时的应力、位移、塑性区半径及极限扩张压力等方面的影响，并将大、小应变理论的结果进行了比较。
The influence of softening extent on stress, displacement and the radius of plastic zone during expansion as well as the extreme expansion pressure are studied.
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