Reason for the transition of fatigue crack initiation site from surface to subsurface inclusions in high-strength steels

2017 ◽  
Vol 40 (11) ◽  
pp. 1718-1730 ◽  
Author(s):  
P. Grad ◽  
E. Kerscher
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
High Strength Steels ◽  
High Strength ◽  
Initiation Site ◽  
Crack Initiation Site

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

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 145
Author(s):  
Yuki Ono ◽  
Halid Can Yıldırım ◽  
Koji Kinoshita ◽  
Alain Nussbaumer
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Stress Relaxation ◽  
Crack Initiation ◽  
High Strength Steel ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Initiation Site ◽  
High Peak ◽  
Crack Initiation Site

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.

OS0527 Systematization of Analysis Method of Fatigue Crack Initiation Site in Pearlitic Steel Smooth Specimen

2011 ◽  
Vol 2011 (0) ◽  
pp. _OS0527-1_-_OS0527-3_
Author(s):  
Shigeru HAMADA ◽  
Daisuke SASAKI ◽  
Nobuo NAKADA ◽  
Toshihiro TSUCHIYMA ◽  
Masaharu UEDA ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Pearlitic Steel ◽  
Initiation Site ◽  
Smooth Specimen ◽  
Analysis Method ◽  
Crack Initiation Site
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