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基于有限元数值分析对等离子喷涂不同的基体上的喷涂陶瓷涂层和金属涂层中残余应力进行了分析,结果表明:涂层与基体体系的最大应力分布在接触界面附近,由中心线向外依次递增,在边缘处达到最大值。在体系中心区域正应力沿厚度方向逐渐减小,而在涂层中应力分布则趋于线性;建立了涂层中各残余应力分量的准数方程式,准数方程式与数值计算结果显示了较好的吻合,而且对于不同基体-涂层体系均是适用的。无因次最大径向应变、无因次剪应力侵入深度和无因次最大径向应力的大小均取决于涂层厚度与弹性模量的积和基体半径与基体弹性模量积之间比值,而影响无因次径向最大剪应力的大小的根本因素为涂层厚度与光斑半径的比值。
Based on the finite element analysis, the residual stress in the sprayed ceramic coating and the metal coating on different plasma sprayed substrates was analyzed. The results show that the maximum stress distribution in the coating and the matrix system is near the contact interface and outward from the center line Increase in order and reach the maximum at the edges. In the center of the system, the normal stress decreases along the thickness direction, while the stress distribution in the coating tends to be linear. The quasi-equations of each residual stress component in the coating are established. The quasi-numerical equations and numerical results show that the normal stress is good Consistent, and suitable for different substrate-coating systems. The dimensionless maximum radial strain, dimensionless shear stress invading depth and dimensionless maximum radial stress both depend on the ratio of the product of the coating thickness and elastic modulus and the product of the base radius and base elastic modulus, The fundamental factor affecting the size of the dimensionless radial maximum shear stress is the ratio of the coating thickness to the spot radius.