Steady-State Growing Crack-Tip Field Characteristics of Mode Ⅲ Elastic-Viscoplastic/Rigid Interface Cracks
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摘要: 考虑裂纹尖端的奇异性和粘性效应，建立了双材料界面扩展裂纹尖端的弹粘塑性控制方程．引入界面裂纹尖端的位移势函数和边界条件，对刚性-弹粘塑性界面Ⅲ型界面裂纹进行了数值分析，求得了界面裂纹尖端应力应变场，并讨论了界面裂纹尖端场随各影响参数的变化规律．计算结果表明，粘性效应是研究界面扩展裂纹尖端场时的一个主要因素，界面裂纹尖端为弹粘性场，其场受材料的粘性系数、Mach数和奇异性指数控制．Abstract: The singularity and viscosity in crack-tip were considered,and the elastic-viscoplastic governing equations of double dissimilar materials at interface crack-tip field were established.The displacement potential function and boundary condition of in terface crack-tip were introduced,and the numerical analysis of rigid-elastic viscoplastic in terface for mode was worked out.The stress-strain fields were obtained at the crack-tip and the variations of solutions were discussed according to each parameter.The numerical results show that the viscosity effect is am ain factor of in terface propagating crack-tip field,and the interface crack-tip is a viscop lastic field that is governed by viscosity coefficient,Mach number and singular factor.
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Key words:
- in terface crack /
- viscosity /
- dynamic propagation /
- elastic-viscoplastic materials
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