用多尺度方法分析热喷涂层应力

Employ multi-scale method to analyze the stress of thermal sprayed coatings

多尺度分析的方法突破了传统均匀化理论的限制,在计算涂层有效性质的基础上,能够进一步分析其微细结构的应力.通过理论分析得到微细结构的控制方程,结合有限元技术,能够精确高效地计算热喷涂层局部微细结构的应力分布.应用均匀化理论结合有限元分析估计了Fe-Cr-A l合金热喷涂层的有效性质(弹性模量、导热系数和热膨胀系数),同时研究了微细裂纹对Fe-Cr-A l合金涂层应力的影响,得到了裂纹处的拉应力和热应力分布情况.

Multi -scale method has overcome the limitations of classical homogenization theory. It can analyze stress of microscopic structures based on computation of effective properties of coatings. Governing equations were derived from theory analysis, which can efficiently gain accurate stress of local microscopic structures using FEM. This paper employed homogenization theory to estimate the properties of Fe - Cr - Al alloy sprayed coatings （modulus of elasticity, thermal conductivity and coefficient of thermal expansion）, also investigated the influence of cracks and obtained the traction and thermal stress of the coatings.