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Open AccessArticle

Fracture Toughness Calculation Method Amendment of the Dissimilar Steel Welded Joint Based on 3D XFEM

1,2 and 1,2,*
1
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China
2
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 509; https://doi.org/10.3390/met9050509
Received: 21 March 2019 / Revised: 26 April 2019 / Accepted: 27 April 2019 / Published: 30 April 2019
(This article belongs to the Special Issue Numerical Modelling and Simulation of Metal Processing)
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PDF [7373 KB, uploaded 30 April 2019]
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Abstract

The dissimilar steel welded joint is divided into three pieces, parent material–weld
metal–parent material, by the integrity identification of BS7910-2013. In reality, the undermatched
welded joint geometry is dierent: parent material–heat aected zone (HAZ)–fusion line–weld metal.
A combination of the CF62 (parent material) and E316L (welding rod) was the example undermatched
welded joint, whose geometry was divided into four pieces to investigate the fracture toughness of the
joint by experiments and the extended finite element method (XFEM) calculation. The experimental
results were used to change the fracture toughness of the undermatched welded joint, and the XFEM
results were used to amend the fracture toughness calculation method with a new definition of the
crack length. The research results show that the amendment of the undermatched welded joint
geometry expresses more accuracy of the fracture toughness of the joint. The XFEM models were
verified as valid by the experiment. The amendment of the fracture toughness calculation method
expresses a better fit by the new definition of the crack length, in accordance with the crack route
simulated by the XFEM. The results after the amendment coincide with the reality in engineering. View Full-Text
Keywords: undermatched; integrity identification; XFEM; fracture toughness calculation method undermatched; integrity identification; XFEM; fracture toughness calculation method
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Qian, Y.; Zhao, J. Fracture Toughness Calculation Method Amendment of the Dissimilar Steel Welded Joint Based on 3D XFEM. Metals 2019, 9, 509.

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