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Article

Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI

1
Department of Civil Engineering, Gifu University, Gifu 501-1193, Japan
2
Department of Civil and Architectural Engineering, Aarhus University, 8000 Aarhus, Denmark
3
ENAC-RESSLab, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Iacoviello
Metals 2022, 12(1), 145; https://doi.org/10.3390/met12010145
Received: 6 November 2021 / Revised: 20 December 2021 / Accepted: 27 December 2021 / Published: 12 January 2022
(This article belongs to the Special Issue Technological Aspects in Fatigue Design of Metallic Structures)
This study aimed to identify the fatigue crack initiation site of high-frequency mechanical impact (HFMI)-treated high-strength steel welded joints subjected to high peak stresses; the impact of HFMI treatment residual stress relaxation being of particular interest. First, the compressive residual stresses induced by HFMI treatment and their changes due to applied high peak stresses were quantified using advanced measurement techniques. Then, several features of crack initiation sites according to levels of applied peak stresses were identified through fracture surface observation of failed specimens. The relaxation behavior was simulated with finite element (FE) analyses incorporating the experimentally characterized residual stress field, load cycles including high peak load, improved weld geometry and non-linear material behavior. With local strain and local mean stress after relaxation, fatigue damage assessments along the surface of the HFMI groove were performed using the Smith–Watson–Topper (SWT) parameter to identify the critical location and compared with actual crack initiation sites. The obtained results demonstrate the shift of the crack initiation most prone position along the surface of the HFMI groove, resulting from a combination of stress concentration and residual stress relaxation effect. View Full-Text
Keywords: high-strength steel; HFMI; residual stress relaxation; X-ray diffraction; neutron diffraction; damage assessment high-strength steel; HFMI; residual stress relaxation; X-ray diffraction; neutron diffraction; damage assessment
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MDPI and ACS Style

Ono, Y.; Yıldırım, H.C.; Kinoshita, K.; Nussbaumer, A. Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI. Metals 2022, 12, 145. https://doi.org/10.3390/met12010145

AMA Style

Ono Y, Yıldırım HC, Kinoshita K, Nussbaumer A. Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI. Metals. 2022; 12(1):145. https://doi.org/10.3390/met12010145

Chicago/Turabian Style

Ono, Yuki, Halid C. Yıldırım, Koji Kinoshita, and Alain Nussbaumer. 2022. "Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI" Metals 12, no. 1: 145. https://doi.org/10.3390/met12010145

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