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摘要：
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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。
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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.
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基金项目：
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作者简介：
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参考文献：
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[1]朱文英.汽车轻量化与高强度钢板的开发进展[J].上海金属,2003,25(4):11-15.
[2]徐伟力,艾健,俞宁峰,等.冲压-刚度的耦合仿真分析技术[J].锻压技术,2006,30(1):6-8.
[3]俞宁峰,汪承璞,李川海.汽车钢板抗凹性试验方法及其应用[J].锻压技术,2004,28(1):51-53.
[4]李东升,周贤宾,吕晓东,等.汽车板抗凹性评价体系及试验机系统[J].北京航空航天大学学报,2003,29(5):467-470.
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