Crack extensions in uncharged and hydrogen-charged side-grooved A(T) specimens of conventionally forged 21-6-9 austenitic stainless steels are simulated using the cohesive zone modeling approach. Two-dimensional plane strain finite element analyses with fixed cohesive parameters are first conducted to fit the experimental load-displacement curves. Similar analyses using varying cohesive parameters as functions of the crack extension are then conducted to fit the experimental load-crack extension and crack extension-displacement curves. The computational results with varying cohesive parameters can fit very well the experimental data. The computational results also indicate that the average cohesive energy for the hydrogen-charged A(T) specimen is lower than that for the uncharged A(T) specimen.

使用内聚区建模方法模拟了常规锻造的21-6-9奥氏体不锈钢的不带电和带氢的侧面开槽A（T）试样的裂纹扩展。首先进行具有固定内聚参数的二维平面应变有限元分析，以拟合实验载荷-位移曲线。然后，使用不同的内聚参数作为裂纹扩展的函数进行了相似的分析，以拟合实验载荷裂纹扩展和裂纹扩展-位移曲线。具有不同内聚参数的计算结果可以很好地拟合实验数据。计算结果还表明，带氢的A（T）试样的平均内聚能低于不带电的A（T）试样。