【作者】 黄洪涛； 于辉； 王秀琳； 翟建伟；

【Author】 HUANG Hong-tao;YU Hui;WANG Xiu-lin;ZHAI Jian-wei;Yanshan University;Sany Heavy Energy Equipment Company Limited;

【机构】 燕山大学机械工程学院； 三一重型能源装备有限公司；

【摘要】 应用扩展有限元法(XFEM)对P280GH钢Ⅰ型、Ⅰ-Ⅱ复合型的裂纹扩展进行数值模拟,选用最大主应力失效准则作为损伤判据,计算了裂纹起裂、扩展及断裂过程,分析了P280GH钢裂纹扩展过程中形变及应力场分布规律,模拟了不同断裂韧度下裂纹扩展过程,结果表明断裂韧度对裂纹扩展路径没有影响,并且利用XFEM计算了单边直裂纹的应力强度因子,计算结果与理论值相比误差小于±5%,表明用XFEM方法计算P280GH钢裂纹扩展问题是可行的。更多还原

【Abstract】 The crack propagation of Ⅰ and Ⅰ-Ⅱ mixed mode crack of P280 GH steel is simulated by extended finite element method(XFEM), the maximum principal stress criterion is applied in the description of crack growth, the process of crack initiation, propagation and fracture is calculated, the rules of stresses and displacements distribution of P280 GH steel in crack propagation are analyzed, crack propagation with different fracture toughness is simulated, the calculated results show that the fracture toughness has no effect on crack propagation path. In addition, using XFEM to compute the stress intensity factor of single edge notched crack, the error of calculated value and theoretical value is less than ±5%, which shows that using XFEM method to simulate crack propagation is feasible.更多还原