Fracture mechanics parameters are used for experimental, numerical and analytical risk assessment of structural integrity and life of oil drilling rig welded pipe with a crack. As a simple analytical tool, the Failure Assessment Diagramme (FAD) has been applied to assess probability of pipe failure, using the ratio of linear elastic fracture mechanics parameter, K_I, and its critical value, K_Ic, in relation to the ratio of applied stress and its critical value. Alternatively, the ratio of J integral, evaluated experimentally and numerically, and its critical value, J_Ic, has been used to estimate probability of failure. Risk was then assessed for all three approaches, in combination with the estimated consequence. Results are given in the form of risk matrix, indicating the effects of the most (analytical) and the least (experimental) conservative estimates. In the case of risk based structural life assessment, number of cycles, obtained analytically and numerically, are related to the number of cycles to the critical crack length, to assess risk due to fatigue.

断裂力学参数用于对具有裂缝的石油钻机焊接管的结构完整性和寿命进行实验，数值和分析风险评估。作为一种简单的分析工具，已使用故障评估图（FAD）来评估管道故障的可能性，使用线性弹性断裂力学参数K _I的比率及其临界值K _Ic与比率的关系。外加应力及其临界值。或者，通过实验和数值评估得出的J积分之比及其临界值J _Ic，已用于估计失败的可能性。然后结合估计的结果评估所有三种方法的风险。结果以风险矩阵的形式给出，表明最大（分析）和最小（实验）保守估计的影响。在基于风险的结构寿命评估中，通过分析和数字得出的循环次数与临界裂纹长度的循环次数相关，以评估疲劳引起的风险。