The present paper discusses the methodology for prediction of fracture parameter, fatigue crack growth life (FC) and inspection interval (II) considering the stiffener effect using Afgrow software of NASGRO crack growth model. Based on numerically predicted normalised stress intensity factor (β) using finite element method (FEM), correction factor (C.F.) in β of un-stiffened panel/plate is introduced to account for the stiffener effect. The β of stiffened plate is further used for prediction of fatigue crack growth life (FC) and II. The fracture parameters of stiffened panel for different crack lengths, stiffener area, and stiffener offset using FEM are predicted, which is further used for estimation of FC and II. The typical numerical prediction of fracture parameter using finite element method and FC with incorporation of C.F. using Afgrow software is compared with published experimental results and analytical prediction which show good conformity.

本文讨论了使用NASGRO裂纹扩展模型的Afgrow软件考虑加劲肋效应的断裂参数，疲劳裂纹扩展寿命（FC）和检查间隔（II）的预测方法。基于使用有限元方法（FEM）进行数值预测的归一化应力强度因子（β），引入未加筋板/板的β中的校正因子（CF）来说明加筋效果。该β加筋板的厚度进一步用于预测疲劳裂纹扩展寿命（FC）和II。预测了使用有限元法对不同裂缝长度，加劲肋面积和加劲肋偏移的加劲肋板的断裂参数，并将其进一步用于FC和II的估算。将有限元方法和FC以及Afgrow软件结合CF的断裂参数的典型数值预测与已发表的实验结果和分析预测进行了比较，这些结果显示出良好的一致性。