一种利用自适应发射率模型补偿搅拌摩擦焊温度场的方法OA北大核心CSTPCD

Aiming at the problem that most of the current research on the temperature field of friction stir welding ignores the effect of thermal radiation or adopts the fixed emissivity model,which leads to large errors,an adaptive emissivity model considering the growth process of aluminum alloy oxide film on rough surface is proposed to compensate the welding temperature field.Firstly,considering the dynamic change of the surface morphology of aluminum alloy during friction stir welding,the quadratic surface response method was used to determine the welding surface roughness and the number of intersections with the average unit length of the average line.Subsequently,a fully coupled finite element model of 6061 aluminum alloy friction stir welding process was established based on the proposed adaptive emissivity,and the simulation results were analyzed.The results show that the maximum absolute error between the results obtained under different welding conditions and the experimental results is only 11 K,which indicates that the numerical model with adaptive emissivity can well reproduce the temperature field in the welding process.