关键词: 电弧增材, 数值模拟, 变形, 应力

Abstract: The deformation and stress of typical frame components of arc additive were simulated by using four algorithms: transient heat source, thermal cycle curve, full thermal cycle and intrinsic strain, and the prediction accuracy and calculation efficiency under different algorithms are analyzed. The results show that the maximum deformation position predicted by the transient heat source algorithm is the top four corners of the frame, and the stress is mainly distributed in the corners and top areas of the frame, which is in good agreement with the experimental results, and the prediction accuracy of feature point deformation and stress is 96.59% and 95.01%, respectively, and the calculation time is 326h;. The prediction accuracy of the thermal cycle curve algorithm is comparable to that of the transient heat source algorithm, but the calculation time is shortened to 117h, and the predicted deformation contour and stress curve are in good agreement with the experimental results. Compared with the first two algorithms, the prediction accuracy of the total thermal cycle and intrinsic strain algorithm for feature point deformation is low, which is 85.68% and 65.86%, respectively, and the predicted deformation contour is quite different from the experimental results, and the reliability is low, but the calculation time is shortened to 4 h and 2 h, respectively, and the efficiency is significantly improved.

Key words: arc additive, numerical simulation, deformation, stress