The results indicate that the crack driving force in harder medium is less than that in softer medium.
结果表明，裂纹位于较硬介质中的裂纹驱动力小于裂纹位于较软介质中的裂纹驱动力。
The crack driving force parameter (J-integral) is calculated and analyzed using ANSYS software in this thesis.
本研究利用ANSYS有限元软件计算和分析裂纹驱动力参量J积分。
When the crack is close to the interface, the crack driving force in harder medium will increase and that in softer medium will decrease.
当裂纹靠近界面时，较硬介质中裂纹驱动力将增大，而较软介质中裂纹驱动力将减小。
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