IMPACT OF FRICTION COEFFICIENT VARIATION ON TEMPERATURE FIELD IN ROTARY FRICTION WELDING OF METALS – FEM STUDY

Q3 Economics, Econometrics and Finance

Applied Computer Science Pub Date : 2023-10-02 DOI:10.35784/acs-2023-22

Andrzej ŁUKASZEWICZ, Jerzy JÓZWIK, Kamil CYBUL

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Abstract

A mathematical model is presented for investigating the temperature field caused by the rotary friction welding of dissimilar metals. For this purpose, an axisymmetric, nonlinear, boundary value problem of heat conduction is formulated with allowance for the frictional heating of two cylindrical specimens of finite length made of Al 6061 aluminium alloy and 304 stainless steel. The thermo-physical properties of materials change with increasing temperature. It was assumed that the coefficient of friction does not depend on the temperature. The mechanism of heat generation due to friction on the contact surface with the temperature field of samples is considered. The boundary problem of heat conduction was reduced to the set of nonlinear ordinary differential equations at time t relative to the values of temperature T at the finite elements nodes. The numerical solution of the problem was obtained with the inverse 2nd order differentiation method implemented in COMSOL FEM system (finite element method), with time step ∆t=0.1 (s). The influence of various values of friction coefficient is presented.

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金属旋转摩擦焊中摩擦系数变化对温度场影响的有限元研究

建立了研究异种金属旋转摩擦焊温度场的数学模型。为此，在考虑Al - 6061铝合金和304不锈钢两种有限长度圆柱形试样摩擦加热的情况下，建立了轴对称非线性导热边值问题。材料的热物理性质随温度的升高而变化。假定摩擦系数与温度无关。考虑了试样温度场与接触面摩擦产生热量的机理。将热传导的边界问题简化为在时间t时相对于有限元节点温度t值的非线性常微分方程。采用COMSOL有限元系统(有限元法)中二阶微分逆法，时间步长∆t=0.1 (s)，得到了问题的数值解，并给出了不同摩擦系数值对问题的影响。

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