Investigation of the Transient Deformation in the Flexible Forming of Laminated Composite Metal Sheets Using Plasma Arc

Abstract

A three-layer FEM model, based on the characteristics along the thickness direction of laminated composite metal sheets (LCMS), was developed to study the variation rules of transient deformation in the flexible forming of LCMS using plasma arc. Besides, the comparisons of the typical LCMS Q235A/1Cr13 and single layer metal sheet (SLMS) Q235A were performed. It indicates that the displacement of end point of SLMS is 0.076 mm larger than that of LCMS with the same process parameters. Moreover, the differences of X-axis plastic strain, Z-axis plastic strain along the thickness direction of LCMS decide the bending direction, the occurrence of the edge effect of LCMS during linear heating, respectively. Furthermore, Y-axis stresses of LCMS different layers undergo three dramatic changes with the maximum stress difference of 1.420×107 Pa, and the possible failure of interface delamination occurs in the bonding interface of Q235A and transition layer.

Numerical and Experimental Research on the Feasibility for Plasma Arc Forming of Laminated Clad Metal Sheets Containing Defects

“…In this work, the stainless steel/mild steel/stainless steel was adopted as the sample. The materials in each layer were presumed as homogeneous and isotropic, and the material physical and mechanical parameters merely changed with temperature [4,5]. Boundary Conditions.…”

“…However, the previous studies mainly focused on the single integral metal sheets. There is little public literature on the flexible bending of LCMS by plasma arc [4,5]. The related studies [6] show that the possible defects such as the blowhole, shrinkage cavity occur in the bonding interface during the preparation of the LCMS.…”

FEM Modeling and Validation of the Temperature Field in the Plasma Arc Bending of Laminated Clad Metal Sheets

“…However, all of the previous studies mainly focused on the single integral metal sheets. The author has recently demonstrated the feasibility of plasma arc bending of the LCMS including two layers of stainless steel and carbon steel [5,6]. In the bending process, the plasma arc is scanning on the surface of the base layer of the carbon steel.…”