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在传热学基础上建立了涂层的三维瞬态导热模型,利用ANSYS仿真软件对施加有正弦规律变化热流密度的涂层试件进行有限元分析;运用两次加载、减法处理的方法有效克服了常量和环境因素带来的影响,然后讨论了数据拟合求相位的方法;改变加载频率,得到了多组涂层厚度与相位的定量关系曲线,从理论计算的角度揭示涂层厚度和相位及加载频率的定量关系;最后利用曲线中的线性线段,总结确定了涂层厚度与相位的定量关系,为利用锁相法对涂层厚度进行精确测量提供了理论依据。
Based on the heat transfer theory, a three-dimensional transient thermal model of the coating was established, and the finite element analysis of the coated specimen with sinusoidal heat flux density was carried out by using ANSYS simulation software. The method of twice loading and subtraction was effectively overcome The effects of constant and environmental factors are discussed. Then the method of fitting the phase of the data is discussed. The quantitative relationship between the thickness and the phase of the coating is obtained by changing the loading frequency. The thickness and phase of the coating are revealed theoretically And the loading frequency. Finally, the quantitative relationship between the coating thickness and the phase was concluded by linear line segments in the curve, which provided a theoretical basis for the accurate measurement of coating thickness by the phase-locked method.