将损伤力学中的破损应变、三轴应力和应变比等参数作为Q235钢薄板出现延性破损的标准,以成形圆锥台件为例,运用ABAQUS有限元软件对Q235钢薄板单点增量成形的延性破损进行了有限元模拟,并进行了相关的试验验证.结果表明:在Q235钢薄板的成形区域上,板料的厚度分布不均匀;圆锥台件底部和顶部的厚度变化率呈对称分布,中部的厚度最薄,是最易出现延性破损的区域;模拟结果能较准确地预测出Q235钢薄板发生延性破损的位置,试验结果证明了所建有限元模型的正确性.
Some parameters, such as damage strain, triaxial stress and strain ratio, were considered as a ductile damage standard of Q235 steel sheet, taking forming conical part as an example, using ABAQUS finite element software to simulate ductile damage of Q235 steel sheet during single point incremental forming, and the related experiments were carried out.The results show that on the forming region of Q235 steel sheet, the thickness of the sheet metal is uneven.The change rates of thickness at the bottom and top of the conical parts are symmetrical, the middle area of the conical part is the thinnest, where the ductile damage appears easily.The results of simulation can predict accurately the ductile damage position of Q235 steel sheet, the experimental results also prove the correctness of finite element model.
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