基于局部高速率增塑效应的高强钢板复杂件精确成形及变形协调控制

针对因高强钢板等轻质高钢板材室温成形性差而导致其大型板材复杂构件传统冲压成形难以实现的问题，申请人在多年研究的基础上，探索基于电磁成形高速率增塑性效应的高强钢板材成形新工艺，提出了基于局部高速率加载的磁脉冲辅助板材成形新思路。采用理论分析、工艺试验与数值模拟的研究方法，运用宏观与微观分析相结合的手段，进行基于局部高速率增塑效应的高强钢板复杂件精确成形及变形协调控制研究，探明高强钢板在高应变率复杂路径加载下的材料响应规律，揭示应变率跨尺度加载时高强钢板坯的塑性变形机制，掌握局部高速率加载板坯变形协调控制规律，寻求高速率局部加载调控高强钢板室温成形性的理论与方法。项目的实施为高强钢板材磁脉冲辅助成形理论和工艺应用的深入研究奠定坚实的理论和实验基础，不仅具有重要的学术价值，而且还具有十分重要的经济和战略意义。

Aiming to the problem of traditional stamping in manufacturing large complex parts of high-strength steel sheets for its poor formability at room temperature, and based on the research foundation of the applicant, the new technologies are explored for manufacturing high-strength steel sheets based on the hyperplasiticity effect of high-speed electromagnetic forming, and the idea of local high-speed loading-based electromagnetically assisted sheet metal forming is proposed. In this project, by using the methods of combining theoretical analysis, experiments, numerical simulation and micro-analysis, studies are conducted on precision forming and deformation coordinated control of complex high-strength steel parts based on the hyperplastic effect of local high-speed forming. Accordingly, materials responses of high-strength steel under complex high-speed loading paths are measured, the plastic forming mechanisms of high-strength steel are revealed under the cross-scale strain rate loadings, and the deformation coordinated regulation of sheets resulting form local high-speed loading are investigated. The research results can be applied to develop the theory and method in regulating the room-temperature formability of high-strength steel by using local high-speed loading. By this project, the stable foundation will be established for the deep theory and experiment investigations of electromagnetically assisted sheet metal forming of high-strength steels, which has not only marked science value but also economical and strategic significance.