scholarly journals Direct, real time observation and mechanism of fatigue crack growth (Relation between growth rate and crack tip opening displacement)

1986 ◽  
Vol 35 (395) ◽  
pp. 918-923 ◽  
Author(s):  
Masahiro JONO ◽  
Jiho SONG ◽  
Kunio GOTOH ◽  
Shinji YAMADA
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Real Time ◽  
Crack Growth ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Time Observation ◽  
Crack Tip Opening ◽  
Real Time Observation

scholarly journals Digital Image Correlation (DIC) Technique for Fatigue Crack Growth Analysis Using ∆CTOD Criteria

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1362
Author(s):  
Akshay B. Patil ◽  
Suraj P. Toppo ◽  
Dr. RKP Singh
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Digital Image Correlation ◽  
Crack Growth ◽  
Digital Image ◽  
Crack Tip ◽  
Image Correlation ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Crack Tip Opening

The present paper deals with an experimental determination of fatigue crack growth rate (FCGR) of microalloyed steel (38MnVS6) to study the crack propagation in forged automobile crankshafts. The criterion based on crack tip opening displacement range (∆CTOD) is used to investigate the fatigue crack growth rate. In the current work use of 2D-digital image correlation (DIC) technique for the measurement of crack tip opening displacement (CTOD) and crack length (a) is proposed. Digital Image Correlation (DIC) is a full field displacement and strain measurement technique. It is easier to measure the crack tip opening displacement (CTOD) and crack length (a) with this technique than other. Fatigue crack growth curve based on crack tip opening displacement (CTOD) criteria is presented using DIC.  

scholarly journals A Numerical Study of the Effect of Isotropic Hardening Parameters on Mode I Fatigue Crack Growth

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 177
Author(s):  
M. F. Borges ◽  
F. V. Antunes ◽  
P. A. Prates ◽  
R. Branco
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Numerical Study ◽  
Isotropic Hardening ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Mixed Hardening ◽  
Parametric Studies ◽  
Crack Tip Opening

The consideration of plastic crack tip opening displacement (CTOD, δp), as a crack driving force has given us the opportunity to predict fatigue crack growth (FCG) rate numerically, and, therefore, to develop parametric studies focused on the effect of loading, geometrical, and material parameters. The objective here is to study the effect of the isotropic hardening parameters of the Voce law on FCG, which are the isotropic saturation stress, YSat, and the isotropic saturation rate, CY. The increase of these hardening parameters causes δp to decrease. However, this effect is much more pronounced for YSat than CY. The variation is non-linear, and the rate of variation decreases with the increase of isotropic parameters. The increase of YSat increases the crack closure phenomenon. Finally, the influence of the isotropic parameters is more relevant for pure isotropic hardening than for mixed hardening.

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