scholarly journals Characteristics of fatigue crack initiation and growth of high strength aluminum alloys under mode II loading in 3.5% saltwater.

1987 ◽  
Vol 36 (409) ◽  
pp. 1110-1115
Author(s):  
Akio OTSUKA ◽  
Kaname MORI ◽  
Takashi YOSHIDA
Keyword(s):  
Fatigue Crack ◽  
Aluminum Alloys ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Mode Ii ◽  
Mode Ii Loading ◽  
High Strength Aluminum Alloys

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.

Corrosion Fatigue Crack Initiation in Aluminum Alloys 7075 and 7050

CORROSION ◽  
2000 ◽  
Vol 56 (10) ◽  
pp. 1022-1031 ◽  
Author(s):  
P. S. Pao ◽  
C. R. Feng ◽  
S. J. Gill
Keyword(s):  
Fatigue Crack ◽  
Aluminum Alloys ◽  
Crack Initiation ◽  
Corrosion Fatigue ◽  
Fatigue Crack Initiation ◽  
Corrosion Fatigue Crack
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