A Theoretical and Experimental Investigation of the Influence of Crack Tip Plasticity on Fatigue Crack Closure

2009 ◽  
pp. 438-438-15
Author(s):  
D Nowell ◽  
LJ Fellows ◽  
DA Hills
Keyword(s):  
Experimental Investigation ◽  
Fatigue Crack ◽  
Crack Closure ◽  
Crack Tip ◽  
Fatigue Crack Closure ◽  
Crack Tip Plasticity

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.

A comparative study of fatigue crack closure

1977 ◽  
Author(s):  
J. RUEPING ◽  
B. HILLBERRY ◽  
S. METTLER ◽  
W. STEVENSON
Keyword(s):  
Fatigue Crack ◽  
Comparative Study ◽  
Crack Closure ◽  
Fatigue Crack Closure

An experimental study of loading parameters effect on fatigue crack closure in 12NC6 steel

2012 ◽  
Vol 46 ◽  
pp. 83-93 ◽  
Author(s):  
B. Ould Chikh ◽  
A. Imad ◽  
H.M. Meddah ◽  
B. Bouchouicha ◽  
M. Benguediab
Keyword(s):  
Experimental Study ◽  
Fatigue Crack ◽  
Crack Closure ◽  
Fatigue Crack Closure

A model for roughness-induced fatigue crack closure

1998 ◽  
Vol 29 (7) ◽  
pp. 1933-1939 ◽  
Author(s):  
Sheng-Hui Wang ◽  
Clemens Müller ◽  
Hans Eckart Exner
Keyword(s):  
Fatigue Crack ◽  
Crack Closure ◽  
Fatigue Crack Closure
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