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

G. Agarwal; H. Gao; M. Amirthalingam; M. J.M. Hermans

doi:10.1080/13621718.2017.1344373

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

G. Agarwal^*, H. Gao, M. Amirthalingam, M. J.M. Hermans

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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.

Original language	English
Pages (from-to)	134-139
Journal	Science and Technology of Welding and Joining
Volume	23
Issue number	2
DOIs	https://doi.org/10.1080/13621718.2017.1344373
Publication status	Published - 2018

Keywords

digital image correlation
FEM
In situ strain
laser welding
weld defects

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10.1080/13621718.2017.1344373

In situ strain investigation ...Final published version, 1.9 MBLicence: CC BY-NC-ND

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AU - Amirthalingam, M.

AU - Hermans, M. J.M.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - digital image correlation

KW - FEM

KW - In situ strain

KW - laser welding

KW - weld defects

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

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Keywords

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