【摘要】 采用平面应力弹塑性有限元法研究了中心裂纹板焊接接头裂尖场J积分参量及其应用的可行性。数值分析采用MARC软件的二维弹塑性分析模型 ,探讨了不同强度匹配 (高、等、低匹配 )的焊接接头试样在加载过程中裂尖场J积分的变化情况。计算结果表明 ,靠近焊接接头裂纹尖端的J积分回路具有明显的路径相关性 ,而远离裂尖的J积分回路表现出路径无关性。焊接接头强度匹配因子M对裂纹尖端的J积分值有很大的影响。对应于每一个载荷P P0 ,J积分的值随着M的增大而减小 ,特别是当P P0 >1.0时这种情况更明显。更多还原

【Abstract】 The J integral in the vicinity of the crack tip in the center cracked panel (CCP) specimens with welded joints are numerically analyzed by the plane stress elastic plastic finite element method. Numerical analysis is carried out by a MARC two dimensional elastic plastic analysis mode. The effects of the welded joints with different strength matching (overmatch, evenmatch, undermatch) on J integral are discussed. The numerical results show the J integral to be virtually path independent except for contours very close to the crack tip, which is the region where finite element analyses are least accurate. The strength matching factor M has a great influence on the J integral in the vicinity of the crack tip. The J integral value decreases with the increase of M for each normalized load P/P 0, especially when the P/P 0>1.0.更多还原