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    Formability Analysis of Tailor-Welded Blanks of Different Thickness Ratios

    Source: Journal of Manufacturing Science and Engineering:;2005:;volume( 127 ):;issue: 004::page 743
    Author:
    L. C. Chan
    ,
    C. L. Chow
    ,
    C. H. Cheng
    ,
    S. M. Chan
    ,
    T. C. Lee
    DOI: 10.1115/1.2034518
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper presents a formability analysis of tailor-welded blanks (TWBs) made of cold rolled steel sheets with varying thicknesses. Steel sheets ranging between 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm in thickness were used to produce TWBs of different thickness combinations. The primary objective of this paper is to characterize the effects of thickness ratios on the forming limit diagram (FLD) for a particular type of TWB. The TWBs chosen for the investigation are designed with the weld line located in the center of the specimens perpendicular to the principal strain direction. Nd:YAG laser butt-welding was used to prepare different tailor-made blank specimens for uniaxial tensile tests and Swift tests. The experimental results of the uniaxial tensile test clearly revealed that there were no significant differences between the tensile strengths of TWBs and those of the base metals. After the Swift tests, the formability of TWBs was analyzed in terms of two measures: The forming limit diagram and minimum major strain. The experimental findings indicated that the higher the thickness ratio, the lower the level of the forming limit curve (FLC) and the lower the formability of the TWBs. The findings also show an inverse proportional relationship between thickness ratios and minimum major strains. TWBs with a thickness ratio of close to 1 were found to have a minimum major strain closer to those of base metals. The effects of different thickness ratios on TWBs were further analyzed with a finite element code in a computer-aided engineering package, PAM-STAMP, while the failure criteria of the TWBs in the finite element analysis were addressed by the FLCs which were obtained from the experiments. However, the weld of the TWB in the simulation was simply treated as a thickness step, whereas its heat affected zones were sometimes disregarded, so that the effects of the thickness ratio could be significantly disclosed without the presence of weld zones. The results of the simulation should certainly assist to clarify and explain the effects of different thickness ratios on TWBs.
    keyword(s): Thickness , Blanks , Base metals , Failure AND Simulation results ,
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      Formability Analysis of Tailor-Welded Blanks of Different Thickness Ratios

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    http://yetl.yabesh.ir/yetl1/handle/yetl/132131
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    contributor authorL. C. Chan
    contributor authorC. L. Chow
    contributor authorC. H. Cheng
    contributor authorS. M. Chan
    contributor authorT. C. Lee
    date accessioned2017-05-09T00:16:50Z
    date available2017-05-09T00:16:50Z
    date copyrightNovember, 2005
    date issued2005
    identifier issn1087-1357
    identifier otherJMSEFK-27899#743_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/132131
    description abstractThis paper presents a formability analysis of tailor-welded blanks (TWBs) made of cold rolled steel sheets with varying thicknesses. Steel sheets ranging between 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm in thickness were used to produce TWBs of different thickness combinations. The primary objective of this paper is to characterize the effects of thickness ratios on the forming limit diagram (FLD) for a particular type of TWB. The TWBs chosen for the investigation are designed with the weld line located in the center of the specimens perpendicular to the principal strain direction. Nd:YAG laser butt-welding was used to prepare different tailor-made blank specimens for uniaxial tensile tests and Swift tests. The experimental results of the uniaxial tensile test clearly revealed that there were no significant differences between the tensile strengths of TWBs and those of the base metals. After the Swift tests, the formability of TWBs was analyzed in terms of two measures: The forming limit diagram and minimum major strain. The experimental findings indicated that the higher the thickness ratio, the lower the level of the forming limit curve (FLC) and the lower the formability of the TWBs. The findings also show an inverse proportional relationship between thickness ratios and minimum major strains. TWBs with a thickness ratio of close to 1 were found to have a minimum major strain closer to those of base metals. The effects of different thickness ratios on TWBs were further analyzed with a finite element code in a computer-aided engineering package, PAM-STAMP, while the failure criteria of the TWBs in the finite element analysis were addressed by the FLCs which were obtained from the experiments. However, the weld of the TWB in the simulation was simply treated as a thickness step, whereas its heat affected zones were sometimes disregarded, so that the effects of the thickness ratio could be significantly disclosed without the presence of weld zones. The results of the simulation should certainly assist to clarify and explain the effects of different thickness ratios on TWBs.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFormability Analysis of Tailor-Welded Blanks of Different Thickness Ratios
    typeJournal Paper
    journal volume127
    journal issue4
    journal titleJournal of Manufacturing Science and Engineering
    identifier doi10.1115/1.2034518
    journal fristpage743
    journal lastpage751
    identifier eissn1528-8935
    keywordsThickness
    keywordsBlanks
    keywordsBase metals
    keywordsFailure AND Simulation results
    treeJournal of Manufacturing Science and Engineering:;2005:;volume( 127 ):;issue: 004
    contenttypeFulltext
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