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Formability and fatigue behavior of tailor (laser) welded blanks for automotive applications.

机译：汽车用拼焊（激光）焊接毛坯的可成型性和疲劳性能。

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摘要

The drive towards weight reduction in the automotive industry has led to the use of tailor welded blanks (TWBs). This work is aimed at evaluating the forming and fatigue behavior of the TWBs with different thickness combinations and compositions. Forming tests were carried out to determine the forming limit diagrams (FLDs) of the TWBs, and compared with those of the individual steel sheets. The results showed that the FLDs of the TWBs lie in-between those of the individually formed steel sheets that comprise the TWBs. A semi-empirical relation based on the mean values of the strain-hardening exponents (n-values) and of the thickness of the base metals was developed to calculate the FLD 0 of the TWBs. The calculated FLD0 values were found to be in good agreement with the experimentally determined values. The fatigue tests showed that TWBs made from zinc coated/galvanized steels exhibited a lower fatigue limit, as compared with the TWB combinations from comparable uncoated steel. This was attributed to the intergranular cracking in the galvanized TWBs, caused by the presence of zinc penetrating beneath the sheet surface.
机译：在汽车工业中，减轻重量的努力已导致使用定制焊接毛坯（TWB）。这项工作旨在评估具有不同厚度组合和成分的TWB的成形和疲劳行为。进行成形测试以确定TWB的成形极限图（FLD），并与各个钢板的成形极限图进行比较。结果表明，TWB的FLD位于构成TWB的单独成形钢板的FLD之间。建立了基于应变硬化指数（n值）平均值和母材厚度的半经验关系，以计算TWB的FLD 0。发现计算出的FLD0值与实验确定的值非常一致。疲劳测试表明，与可比较的未镀层钢的TWB组合相比，由镀锌/镀锌钢制成的TWB表现出更低的疲劳极限。这归因于镀锌TWB中的晶间裂纹，这是由于锌渗透到薄板表面下方引起的。

著录项

  • 作者

    Anand, Dheeraj.;

  • 作者单位

    Ryerson University (Canada).;

  • 授予单位 Ryerson University (Canada).;
  • 学科 Engineering Automotive.;Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2004
  • 页码 108 p.
  • 总页数 108
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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