应变强化对钢板局部凹痕抗力影响研究  

Influence of strain strengthening on steel sheet dent resistance

作　　者：吴华[1] 蒋浩民[2] 

机构地区：[1]宝钢新日铁汽车板有限公司销售部,上海201900 [2]宝山钢铁股份有限公司技术中心,上海201900

出　　处：《锻压技术》2008年第1期27-29,共3页Forging & Stamping Technology

摘　　要：随着车身轻量化要求的日益提高,抗凹性作为汽车外覆盖件选择的重要指标越来越受到关注。本文以4种不同屈服强度的钢板为研究对象,开展了不同单拉预变形条件下板材局部凹痕抗力试验。结果显示,单拉预变形过程的应变强化将显著提高钢板的强度和局部凹痕抗力。随着钢板屈服强度的提高,产生一定深度永久凹痕变形所需的载荷也增大,抗凹陷能力得到进一步加强。对于大型汽车外覆盖件,冲压工艺过程的应变强化将提高其抗凹性。With the increasing requirements to the lightening of auto body, as an important index of material selection of outer panel, the sinking resistance is noticed by the designer. The dent resistance tests of four steel grades with different yield strength were carried out in different pre-strains. It is shown that the strain strengthening will obviously improve the strength of sheet steel and the local dent resistance. With the increasing of yield strength of steel sheet, the load in certain dent depth will increase and the dent resistant ability will be strengthened further. The dent resistant ability will be improved by the strain strengthening in the stamping process.

关 键 词：钢板 应变强化 抗凹性 局部凹痕抗力 

分 类 号：TG386[金属学及工艺—金属压力加工]