Typically, the crack tip opening displacement (CTOD) is used only to quantify the crack closure phenomenon. However, more information about crack tip phenomena can be extracted from the CTOD curves, which can be used for a better understanding of fatigue crack growth. The main objective here is the development of a numerical tool for the automatic analysis of CTOD plots, which can be obtained either numerically using the finite element method (FEM) or experimentally using digital image correlation (DIC). The parameters extracted are the elastic and plastic CTOD in loading and unloading regimes, the corresponding load ranges, the crack opening and closure levels and the dissipated energy. This tool is expected to promote a fast and efficient analysis of DIC and FEM results, facilitating the implementation of CTOD analysis in the fatigue community.

中文翻译：

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用于通过DIC或FEM获得的CTOD曲线分析的数值工具

通常，裂纹尖端的开度位移（CTOD）仅用于量化裂纹闭合现象。但是，可以从CTOD曲线中提取有关裂纹尖端现象的更多信息，这些信息可以用于更好地理解疲劳裂纹扩展。此处的主要目的是开发一种用于自动分析CTOD图的数值工具，可以使用有限元方法（FEM）或通过使用数字图像相关性（DIC）通过实验获得数值工具。提取的参数是在加载和卸载状态下的弹塑性CTOD，相应的载荷范围，裂纹的开合水平和耗散的能量。预计该工具将促进对DIC和FEM结果的快速有效分析，从而促进疲劳社区中CTOD分析的实施。