Abstract Quantitative analysis is required to explore the mechanism of crack generation in ultrafast laser drilling of thermal barrier coated nickel superalloy. In this study, a simple thermo-mechanical coupled model is established to obtain temperature history, phase transformation stress and thermal stress during drilling process, in which laser beam scanning, laser intensity attenuation, the nonlinear relationship between drilling depth and drilling time are involved. The induced stress obtained from the present model is compared with the results by digital image correlation (DIC) method. According to the crack distribution around the drilled hole, the present model is used to explain the mechanism of crack behavior in drilling of multilayer materials. Finally, the strategy using low pulse repetition rate or water jet assisted method is suggested to reduce the thermal effect in ultrafast laser drilling process.

中文翻译：

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热障涂层镍高温合金超快激光钻孔的裂纹行为

摘要 热障涂层镍高温合金超快激光钻孔裂纹产生机理需要定量分析。本研究建立了一个简单的热-机械耦合模型来获取钻孔过程中的温度历程、相变应力和热应力，其中涉及激光束扫描、激光强度衰减、钻孔深度与钻孔时间的非线性关系。从本模型获得的诱导应力与数字图像相关 (DIC) 方法的结果进行比较。根据钻孔周围的裂纹分布，本模型用于解释多层材料钻孔中裂纹行为的机制。最后，