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首页> 外文期刊>Metals and Materials International >Reverse effect of tensile force on sidewall curl for materials with tensile/compressive strength difference
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Reverse effect of tensile force on sidewall curl for materials with tensile/compressive strength difference

机译：对于具有拉伸/压缩强度差的材料，拉伸力对侧壁卷曲的反向影响

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摘要

Sidewall curl occurring by the removal of tool surfaces after forming is one adverse phenomenon that should be effectively reduced in sheet metal forming operations. Among several process parameters controlling sidewall curl, a constraint tensile force is widely used along with attainable formability by introducing blank holder and drawbead. The classic but common knowledge is that sidewall curl is suppressed for conventional sheet metals as the constraint tensile force increases. Interestingly, however, for magnesium alloy sheets that have unusual asymmetry in tension and compression it has been recently reported that springback increases as the tensile force increases within a specific range of tension. The major deformation in the sidewall usually consists of bending and unbending under tensile force. Therefore, this unique stress-strain response of sheet materials with strength-differential, including magnesium alloys, should be considered for an accurate estimation of sidewall curl. In the present study, a semi-analytical bending/unbending theory incorporating characteristic constitutive behavior of magnesium alloys was developed to evaluate the moment-curvature relationship for various levels of constraint tensile forces. The present analysis proved that the reverse effect of constraint tensile force on sidewall curl was caused by the lower resistance to plastic yielding in compression with proper combination of applied tensile force.
机译：成型后去除工具表面而引起的侧壁卷曲是一种不利现象，应在钣金成型操作中有效减少这种现象。在控制侧壁卷曲的几个工艺参数中，通过引入毛坯支架和拉延筋，约束张力和可达到的可成型性得到了广泛的应用。经典但常识是，随着约束拉力的增加，传统钣金件的侧壁卷曲得到抑制。然而，有趣的是，对于在拉伸和压缩中具有不寻常的不对称性的镁合金薄板，最近有报道说，在特定的拉伸范围内，随着拉伸力的增加，回弹力也会增加。侧壁的主要变形通常是在拉伸力作用下弯曲和伸直。因此，应考虑强度差的板材（包括镁合金）的这种独特的应力-应变响应，以精确估算侧壁的弯曲度。在本研究中，发展了一种结合镁合金特征本构行为的半解析弯曲/伸直理论，以评估不同水平的约束拉力的弯矩-曲率关系。目前的分析证明，约束拉力对侧壁弯曲的反向作用是由于在适当组合施加的拉力的情况下，较低的抗压缩塑性屈服性引起的。

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  • 来源
    《Metals and Materials International》 |2009年第3期|353-363|共11页
  • 作者

    Ji Hoon Kim; Myoung-Gyu Lee; Sung-Joon Kim; Kwansoo Chung; Robert H. Wagoner;

  • 作者单位

    Department of Materials Science and Engineering The Ohio State University 2041 College Road Columbus OH 43210 USA;

    Ferrous Alloy Research Group Korea Institute of Materials Science 531 Changwondaero Changwon-si Gyeongnam 641-010 Korea;

    Ferrous Alloy Research Group Korea Institute of Materials Science 531 Changwondaero Changwon-si Gyeongnam 641-010 Korea;

    School of Materials Science and Engineering Seoul National University San 56-1 Shilim-dong Gwanak-gu Seoul 151-742 Korea;

    Department of Materials Science and Engineering The Ohio State University 2041 College Road Columbus OH 43210 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    sidewall curl; strength-differential; springback; magnesium alloy; moment-curvature curve;

    机译：侧壁卷曲;强度-差;回弹;镁合金;弯矩曲率;

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