热障涂层在机械载荷与激光联合作用下的变形与破坏研究

STUDIES ON THE DEFORMATION AND FAILURE OF THERMALBARRIER COATING UNDER THERMAL-MECHANICAL LOADING

在以激光器为热源和机械加载的工作环境中对热—力联合作用下含有梯度层的热障涂层的变形和破坏行为进行研究。通过实验,分析讨论热障涂层破坏形式以及涂层厚度和梯度层的影响。在有限元分析中,考虑材料的塑性变形以及物理性质随温度变化的情况,模拟实验过程中应力和应变的时空分布,模拟结果与实验观察现象和结果吻合良好。

The objective of this research was to study the deformation and failure of ceramic thermal barrier coating（TBC）, with and without functionally graded material（FGM） under thermal-mechanlcal loading. The behavior of TBC failure and the effect of thickness of coating and FGM were investigated experimentally. Plasticity and temperature-dependent character of material properties were employed, the deformation and stresses of the specimens were analyzed using the finite element method（FEM）.