一种简便的隔热涂层残余应力分析方法及结果讨论

A SIMPLE METHOD FOR CALCULATION OF RESIDUAL STRESS IN THERMAL BARRIER COATING

从涡轮叶片隔热涂层等离子喷涂的工艺过程中残余应力形成机理为出发点，通过对喷涂过程进行合理的分析和简化，并结合有限元方法，给出了一个可行的隔热涂层残余应力分析简便方法。最后通过算例，进行了分析讨论。

The residual stresses are always emerged in plasma sprayed coatings due to their spray method.The accurate calculation of the residual stresses is important for strength evaluation and thermal fatigue prediction of the coatings,as well as for controlling and evaluating the spraying process.First of all,a main process causing residual stress is identified by analyzing plasma spray process and simplified into a model.The residual stresses in the coated part is resulted from the difference in thermal expansivities of the various materials involved.According to the above mentioned,authors bring forward a simple method for calculating residual stresses,which can be easily used with finite element method.Finally,as a demonstration,cylinder-type specimens are chosen to calculate residual stresses with FEM under various calculating conditions.