【摘要】 本文运用有限元法对双悬臂梁（DCB）试件动态裂纹迅速扩展进行了分析,指出当采用线性位移场的单元时,线性释放节点约束力是合理的。实例计算表明:动态裂纹尖端应力强度因子计算值与实验值能较好地符合,同时对文中提出的两参数——动态裂纹尖端张开角及材料止裂时的裂纹尖端张开角——的计算结果表明:它们与动态裂纹尖端应力强度因子 K_1D及材料止裂韧性 K_1A等价。建议在动态裂纹迅速扩展及止裂分析中也可采用此参数。更多还原

【Abstract】 In this paper,a dynamically running crack in a DCB specimen is numericallymodelled by the finite element method.It has been indicated that a linear release ofnodal-restrained force is reasonable when elements with a linear displacement areused.The results obtained numerically for K_ID are in good agreement with the experi-mental values.Two parameters—the dynamic crack tip opening angle（CTOA）)_CD and thecrack tip opening angle at crack arrest（CTOA）_CA—have also been evaluated.Theresults show that they appear to be equivalent to K_ID and I_IA respectively and cantherefore be used for the analysis of rapid crack propagation and crack arrest.更多还原