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由于高强板的应用使厚板回弹更加难以精确控制,而传统冲压分析软件的壳单元对厚板回弹基本失效,为此,利用具有强大非线性分析功能的MARC软件对厚板回弹进行分析。通过分析厚板相对于薄板的成形性特点,归纳出厚板回弹分析的控制要点,并依据相应的控制要点梳理出MARC回弹分析的一般流程。为最大限度降低有模法人为拉应力的形成以及计算成本,提出有模法与无模法相结合的混模回弹分析方法。最后以某车架纵梁为例,对该算法进行验证,结果表明所提及的算法在减少计算成本的同时有效降低人为拉应力的产生,且实体单元的回弹更加逼近实测值。
Due to the application of high-strength plate rebound more difficult to accurately control the thickness, and the traditional stamping software shell unit of the basic failure of rebound on the plate, therefore, the use of a powerful non-linear analysis of MARC software rebound on the plate analysis. By analyzing the formability of the slab relative to the sheet, the key points of slab rebound analysis are summed up, and the general flow of MARC rebound analysis is combed according to the corresponding control points. In order to minimize the formation of artificial tensile stress and the computational cost, a hybrid model rebound analysis method is proposed, in which the combined mode and the modeless mode are combined. Finally, taking a frame longitudinal beam as an example, the algorithm is validated. The results show that the proposed algorithm can effectively reduce the artificial tensile stress while reducing the computational cost, and the springback of the physical unit is closer to the measured value.