This work characterises crack growth in AA2024-T315 by combining different methods to further increase the reliability of the results. The Christopher-James-Patterson (CJP) model was fitted to experimental data obtained by digital image correlation (DIC). The effective value of the CJP stress intensity factors were successfully correlated with the ΔK-da/dN curve as obtained with Scanning Electron Microscopy measurements of the depth of striations on the fracture surface. This approach based on fitting the CJP model with DIC data and SEM observations allowed estimation of opening and closure loads and allowed the propagation rate and fracture mode to be effectively characterised.

这项工作通过结合不同的方法来表征 AA2024-T315 中的裂纹扩展，以进一步提高结果的可靠性。Christopher-James-Patterson (CJP) 模型适合通过数字图像相关 (DIC) 获得的实验数据。CJP 应力强度因子的有效值成功地与 ΔK-da/dN 曲线相关，如通过扫描电子显微镜测量断裂表面上的条纹深度获得的。这种基于用 DIC 数据和 SEM 观察拟合 CJP 模型的方法允许估计打开和关闭载荷，并允许有效地表征传播速率和断裂模式。