Predicting Fatigue Crack Growth and Fatigue Life Under Variable Amplitude Loading

2010 ◽  
Vol 2010 (2) ◽  
pp. 37-51
Author(s):  
Michal Jasztal ◽  
Dorota Kocanda ◽  
Henryk Tomaszek
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Probabilistic Approach ◽  
Alloy Sheet ◽  
Load Spectrum ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Fatigue Life Estimation

Predicting Fatigue Crack Growth and Fatigue Life Under Variable Amplitude Loading A probabilistic approach to the description of fatigue crack growth and fatigue life estimation of a component subjected to variable amplitude loading is presented in the paper. The core of the model is a differential equation originated from the Paris formula. In order to consider the influence of overload-underload cycles existing in an exploitive load spectrum on crack growth rate for an aeronautical aluminum alloy sheet, the modified Willenborg retardation model was applied.

Observing Load Sequence Effects on Simulated and Experimental Fatigue Crack Growth Occurrence

2011 ◽  
Vol 462-463 ◽  
pp. 489-494 ◽  
Author(s):  
S.M. Beden ◽  
Shahrum Abdullah ◽  
Ahmad Kamal Ariffin ◽  
Nawar A. Kadhim
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Test Data ◽  
Growth Models ◽  
Load Cycle ◽  
Engineering Structures ◽  
Variable Amplitude Loading ◽  
Variable Amplitude

Load cycle interactions can have a significant effect in fatigue crack growth (FCG) under variable amplitude loading. Studying of FCG and fatigue life calculation under spectrum loading is important for the reliable life prediction of engineering structures. Many models have been proposed, but yet no universal model exists. In this paper, a fatigue life predicted under various load spectra, using three different fatigue crack growth models namely, the Austen, modified Forman and NASGRO models. These models are validated with fatigue crack growth test data under various amplitude loadings. This application is performed with aids of three-point bend specimens of ASTM A533 steel material. The results clearly show the load sequences effect and the predicted results agree with some discrepancies between the different models as well as with the test data. Thus, neglecting the effect of cycle interaction in fatigue calculations under variable amplitude loading can lead to invalid life predictions.

Fatigue crack growth modelling of Fão Bridge puddle iron under variable amplitude loading

2020 ◽  
Vol 136 ◽  
pp. 105588 ◽  
Author(s):  
José Correia ◽  
Hermes Carvalho ◽  
Grzegorz Lesiuk ◽  
António Mourão ◽  
Lucas Figueiredo Grilo ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Modelling ◽  
Variable Amplitude Loading ◽  
Variable Amplitude
Sign in / Sign up

Export Citation Format

Share Document