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Modeling of facesheet crack growth in titanium-graphite hybrid laminates, Part I

机译：钛-石墨混合层压板中面板裂纹扩展的建模，第一部分

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Experimental observations have indicated that in titanium-graphite hybrid laminates, fatigue cracks in the titanium facesheets initiate at free edges as well as in areas of high stress concentration, such as holes and notches. In addition, a delaminated region between the facesheet and the intact plies develops and propagates in the wake of the facesheet crack. This paper investigates different modeling techniques for predicting the coupled damage growth. Two modeling approaches were applied; a two-dimensional bridged-crack (BC) model and the virtual crack closure technique (VCCT). The VCCT was applied in two and three-dimensional finite element models and the trends were shown to be the same for both cases. However, the trends predicted using the VCCT are significantly different than the BC model. The reasons for the discrepancies are discussed. The model predictions are compared to experimental results in the second part of this paper.
机译：实验观察表明，在钛-石墨混杂层压板中，钛面板中的疲劳裂纹在自由边缘以及高应力集中的区域（例如孔和缺口）处引发。另外，在面板裂缝之后，面板和完整层之间的分层区域发展并传播。本文研究了用于预测耦合损伤增长的不同建模技术。应用了两种建模方法;二维桥接裂纹（BC）模型和虚拟裂纹闭合技术（VCCT）。 VCCT被应用于二维和三维有限元模型，并且两种情况的趋势都相同。但是，使用VCCT预测的趋势与BC模型显着不同。讨论了产生差异的原因。在本文的第二部分中，将模型预测与实验结果进行了比较。

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