Calculation and In-situ Measurement of HAZ Stress Based on Digital Image Correlation Method

doi:10.3901/JME.2019.17.029

Abstract

Abstract: An in-situ measurement and evaluation methods are proposed about the high temperature full field strain in the welding heated affected zone (HAZ). A novel speckle preparation method is developed. The random speckle pattern can survive at temperatures up the melt point of the base metal. A pulsed laser based auxiliary illumination and near infrared filtering system are utilized to suppress the intense welding arc and obtain the clear speckle pattern image in the HAZ during arc welding process. The inverse compositional Gauss-Newton algorithm with the second-order shape function and bi-cubic interpolation is developed for the welding deformation complexity in the HAZ. The incremental constitutive relations is built considering the multi-dimensional stress and strain space, and the full-field residual stress is calculated quantitatively in the HAZ. The results show that the digital image correlation (DIC) system setup can provide an effective and accurate characterization method for the full-field strain measurement and reliability assessment of the welded joint.

Key words: welding heated affect zone, digital image correlation, in-situ measurement, residual stress

CLC Number:

TG404

SONG Yulin, BAI Xudong, CHEN Xiaoqi, CHEN Shanben, CHEN Huabin. Calculation and In-situ Measurement of HAZ Stress Based on Digital Image Correlation Method[J]. Journal of Mechanical Engineering, 2019, 55(17): 29-34.

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