Experimental and Numerical Simulation Study of Plasticity-Induced and Roughness-Induced Fatigue Crack Closure

2014 ◽  
Vol 891-892 ◽  
pp. 307-312
Author(s):  
Kenichi Masuda ◽  
Sotomi Ishihara ◽  
Yuya Sugai ◽  
A.J. McEvily
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Carbon Steel ◽  
Crack Closure ◽  
Work Hardening ◽  
Crack Opening ◽  
Fatigue Crack Closure ◽  
Work Hardening Coefficient ◽  
Hardening Coefficient ◽  
Alloy 6061

In this study, fatigue crack closure behavior was investigated in the aluminum alloy 6061-T6 and the carbon steel JIS. S25C. It was found that crack closure in the aluminum alloy 6061-T6 showed the characteristics of plasticity-induced fatigue crack closure (PIFCC), whereas the carbon steel JIS. S25C showed the characteristics of roughness-induced fatigue crack closure (RIFCC). The experiments included the determination of the crack-opening levelsKopas a function of stress intensity factor range ΔKand the effect of surface removal on the crack-opening level. In order to simulate the behaviors of the plasticity-and the roughness-induced fatigue crack closure, the finite element method was adopted. The results of FEM were in good agreement with the experimental results. It was cconcluded that at a given yield strength level , a low Youngs modulus and a low work-hardening coefficient will favor PIFCC, whereas a high Youngs modulus and a high work-hardening coefficient will favor RIFCC.

0608 Study on fatigue crack closure behavior of aluminum alloy and carbon steel.

2012 ◽  
Vol 2012.49 (0) ◽  
pp. 060801-060802
Author(s):  
Yuya SUGAI ◽  
Sotomi ISHIHARA ◽  
J. McEvily Arthur. ◽  
Takuya MIYAMOTO
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Carbon Steel ◽  
Crack Closure ◽  
Fatigue Crack Closure

Characterizing Fatigue Crack Closure by Numerical Analysis

2008 ◽  
Vol 33-37 ◽  
pp. 273-278 ◽  
Author(s):  
Ya Zhi Li ◽  
Jing He ◽  
Zi Peng Zhang ◽  
Liang Wang
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Numerical Analysis ◽  
Fatigue Crack Growth ◽  
Crack Length ◽  
Crack Growth ◽  
Crack Closure ◽  
Crack Opening ◽  
Crack Tip ◽  
Fatigue Crack Closure

The crack closure phenomenon has attracted great attention in the prediction of fatigue crack growth. The finite element analysis of fatigue crack growth has been conducted by many researchers mainly emphasized on the technique implementation of the simulation. In this paper the behavior of plasticity induced fatigue crack closure was analyzed by the elastic-plastic finite element method for middle crack tension (MT) specimen. The material was assumed as linear-kinematic hardening. The crack growth was simulated by releasing the “bonded” node pairs ahead of crack tip in stepwise. The calculations focused on the effects of load cases and crack length on crack opening/closure levels. For constant amplitude cyclic loadings with different load ratios, the crack opening/closure levels increases for a while and then decreases continuously, with the increase of crack length. For the loadings with invariable maximum stress intensity factors (briefly the constant-K loading), however, the crack tip plastic zone sizes at different crack lengths remain unchanged and the crack opening and closing load levels normalized by the maximum load levels keep constants as well. The results indicate that the crack length does not affect the relative opening and closure levels and numerical analysis for the constant-K loading case should play a key role in characterizing the fatigue crack growth behavior.

S1903-1-5 Research for fatigue crack closure of friction stir welded 2024T-3 aluminum alloy

2009 ◽  
Vol 2009.5 (0) ◽  
pp. 279-280
Author(s):  
Takao Okada ◽  
Shinya Fujita ◽  
Motoo Asakawa ◽  
Toshiya Nakamura ◽  
Shigeru Machida ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Crack Closure ◽  
Fatigue Crack Closure ◽  
Friction Stir
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