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首页> 外文会议>Mechanical properties and performance of engineering ceramics and composites IX >APPLYING FRACTURE MECHANICS METHODS TO MODEL COATING DELAMINATION
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APPLYING FRACTURE MECHANICS METHODS TO MODEL COATING DELAMINATION

机译：应用断裂力学方法进行模型脱层

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The demand for sustaining continually higher temperatures in the hot sections of gas turbine engines is driving the application of Thermal Barrier Coatings (TBCs) in such harsh operating environments. In service, TBCs are subject to delamination and spallation, thereby rendering their adequate design a challenging task. Computational methods such as the J-integral method, the Virtual Crack Closure Technique (VCCT) and Cohesive Zone Modeling (CZM) are evaluated in a parametric framework to predict the interfacial crack driving force at the bi-material junction of a model TBC-substrate system. The crack-tip strain energy release rate, computed either via the J-integral method or the VCCT, gives the interfacial crack driving force. Each of the above methods is evaluated against standard metrics: ease of problem setup, computing time and accuracy of the results as compared to published analytical solutions. The predicted g is supplied as input to the CZM framework, which is used to perform parametric investigations of mixed-mode crack propagation at the TBC-substrate bi-material interface.
机译：在如此恶劣的工作环境中，要求在燃气涡轮发动机的高温区域中持续保持较高的温度，这推动了热障涂层（TBC）的应用。在使用中，TBC容易分层和剥落，因此使其适当的设计成为一项艰巨的任务。在参数框架中评估诸如J积分方法，虚拟裂纹闭合技术（VCCT）和内聚区建模（CZM）之类的计算方法，以预测模型TBC基板双材料接合处的界面裂纹驱动力系统。通过J积分法或VCCT计算的裂纹尖端应变能释放速率给出了界面裂纹驱动力。以上每种方法均根据标准指标进行评估：与已发布的分析解决方案相比，问题设置的简便性，计算时间和结果的准确性。预测的g作为输入提供给CZM框架，该框架用于对TBC-基板双材料界面处的混合模式裂纹扩展进行参数研究。

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