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先进高强钢成形后回弹严重影响成形件形状精度。提出一种新的多尺度无网格自适应分析方法准确预测先进高强钢成形后的回弹量,优化工艺参数提高成形精度。利用无网格形函数多尺度特性把应力、应变分解成高、低尺度分量,采用应力、应变高尺度分量表征应力、应变梯度;采取自适应分析技术在高梯度区加密无网格节点;在准确构建先进高强钢本构关系的基础上建立先进高强钢板材成形自适应无网格数值模型。针对先进高强钢U形弯曲进行无网格数值模拟,数值结果表明,所构建无网格数值模型可准确预测先进高强钢成形后的回弹,可有效提高先进高强钢成形质量。
After the formation of advanced high strength steel rebound seriously affect the shape of precision parts. A new multi-scale meshless adaptive analysis method is proposed to accurately predict the springback of advanced high strength steel after forming, optimize the process parameters and improve the forming accuracy. The stress and strain are decomposed into high and low scale components by the multi-scale feature of meshless function, and the stress and strain components are characterized by high-stress and strain components. Adaptive analysis is used to encrypt meshless nodes in high-gradient regions. Based on the accurate construction of the constitutive relationship of advanced high strength steel, an adaptive meshless numerical model of advanced high strength steel sheet forming was established. The meshless numerical simulation of U-bend of advanced high-strength steel is carried out. The numerical results show that the meshless numerical model can accurately predict the rebound of advanced high strength steel after forming, which can effectively improve the forming quality of advanced high strength steel.