基于极限约束法的高强度钢板成形性分析及轻量化选材

基于对有限元逆算法的改进,提出了极限约束法.它在计算时只考虑单元边界节点的两种极限约束状态,通过极限约束评判法则来快速、有效地预测板料的成形性;再通过对边界节点约束力的优化计算,可以得到最佳成形结果.文中还对汽车保险杠采用新研发的高强度钢板的成形性进行模拟试验,作为极限约束法的实例验证.     

拼焊车门内板冲压成形性分析

首先介绍了采用不等厚拼焊板的车门内板在冲压成形过程中出现的问题;接着对缺陷区域进行主应变测量和安全成形裕度预测.结果表明,车门内板出现破裂和起皱的主要原因是拉延筋阻力不足和厚、薄两侧板料的流动阻力不均.最后提出采取局部调整拉延筋阻力和压边力等措施来改善车门内板冲压成形性.     

Extensive application of TMCP steel plates to ship hulls: 40 kgf/mm class high yield stress steel

A study was performed on TMCP (thermo-mechanical control process) - manufactured high-tensile steel plates with yield point of 40 kgf/mm² (YP40), which were recently developed for use in ship production and whose ease of shop fabrication is almost equal to that of the well-proven ship high-tensile steel plates (HT50) with yield points at 32 and 36 kgf/mm² levels.

The authors' study addressed the performance required of the YP40 TMCP high-tensile steel for ship applications, including strength characteristics of base metal and high-heat-input welded joints, and also shop fabrication methods suitable to this material.     

高成形性细晶粒热轧板在汽车上的应用研究

对高成形性细晶粒热轧C-Mn钢板在汽车上的应用进行研究,并阐明该钢板具有良好成形性的原因。对高强度细晶粒钢板的焊接性能也进行试验和分析,试验结果表明该钢板的焊接性能良好,焊后的韧性令人满意。