In situ strain investigation during laser welding using digital image correlation and finite-element-based numerical simulation

Journal article (2018)

Authors

G. Agarwal (OLD) MSE-5
H. Gao (OLD) MSE-5
M. Amirthalingam Indian Institute of Technology Madras
M.J.M. Hermans (OLD) MSE-5
Research Group
(OLD) MSE-5
Copyright: © 2018 G. Agarwal, H. Gao, M. Amirthalingam, M.J.M. Hermans
DOI
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https://doi.org/10.1080/13621718.2017.1344373
FEM Laser welding Digital image correlation In situ strain Weld defects
More Info
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Published Date

2018

Language

English

Research Group

(OLD) MSE-5

Abstract

In situ strain evolution during laser welding has been measured by means of digital image correlation to assess the susceptibility of an advanced high strength automotive steel to solidification cracking. A novel method realised using auxiliary illumination and optical narrow bandpass filter allowed strain measurements as close as 1.5 mm from the fusion boundary with good spatial and temporal resolution. A finite-element thermomechanical model of the welding process supports the experimentally measured transverse strain. The validated finite-element numerical model can be used to assess the local strain and associated stress conditions which influences weldability and in particular, solidification cracking.