Analysis of Surface Strain Distribution over the Biaxial Stretch-Formed and Deep-Drawn Cups of Cu-Cr-Zr-Ti Alloy Thin Sheet

EasyChair Preprint no. 10085

Abstract

In the present study, the strain distribution profiles were determined by deforming the Cu-Cr-Zr-Ti alloy sheets through stretch forming and deep drawing experiments, and the limiting dome height (LDH) and cup depth of the deformed components were evaluated. The finite element (FE) models of both the processes were developed by incorporating the Hill48 anisotropy yield criterion and Hollomon power hardening law to predict the strain distribution profiles. The LDH of the stretch-formed component was 20 mm, whereas the cup depth obtained from the deep drawing process was 33.5 mm. In stretch forming experiment, the strain localization was observed at a distance of 17.14 mm from the pole with major and minor strain values of 0.43 and 0.19, respectively. The top edge of the deep-drawn cup wall region was found to deform under radial tension-circumferential compression mode, whereas the deformation at the cup corner region followed close to plane strain mode with major and minor strain values of 0.12 and 0.04, respectively. Also, the grain size, precipitates and texture were characterized through optical microscopy, SEM-EDS and EBSD techniques. This material showed excellent formability without orange peel and earing defects in the deformed samples due to its higher n-value of 0.46, lower grain size of 25-30 micron and negligible planar anisotropy parameter of -0.04.

Keyphrases: Cu-Cr-Zr-Ti alloy, deep drawing, FE modeling, Microstructure, Strain distribution, Stretch forming

@Booklet{EasyChair:10085,
  author = {Dibya Ranjan Behera and Sushanta Kumar Panda and Sujoy Kumar Kar and K. Thomas Tharian and S.V.S. Narayana Murty},
  title = {Analysis of Surface Strain Distribution over the Biaxial Stretch-Formed and Deep-Drawn Cups of Cu-Cr-Zr-Ti Alloy Thin Sheet},
  howpublished = {EasyChair Preprint no. 10085},

  year = {EasyChair, 2023}}