Measurement of strengths and fracture initiation strains of weld metal and HAZ in steel joints using miniature coupons
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2024-08-22
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Engineering Fracture Mechanics
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PERGAMON-ELSEVIER SCIENCE LTD
Melbourne Authors
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Infrastructure Engineering
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Journal Article
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Liu, X., Yan, S., Zhou, J., Rasmussen, K. J. R. & Deierlein, G. G. (2024). Measurement of strengths and fracture initiation strains of weld metal and HAZ in steel joints using miniature coupons. Engineering Fracture Mechanics, 307, https://doi.org/10.1016/j.engfracmech.2024.110293.
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Abstract
This paper investigates the strengths (f y, f u) and fracture initiation strains (ε f) of the weld and heat affected zone (HAZ) of welded joints. Miniature coupons were extracted and tested using a custom-built jig. The weld metal was generally isotropic with the highest and lowest ε f in the longitudinal and transverse directions, respectively. The HAZ had higher f y and f u than the base metal but smaller ε f in the transverse direction under low stress triaxiality, indicating possible fracture through the weld and HAZ when loaded transversely. The strengths of the weld metal and HAZ can be approximated to within 7%-10% using empirical hardness-strength correlation functions.