Fatigue crack growth and life prediction under mixed-mode loading

2018 ◽  
Author(s):  
S. Sajith ◽  
K. S. R. K. Murthy ◽  
P. S. Robi
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Life Prediction ◽  
Mixed Mode Loading

A Fracture Mechanics Based Methodology for Fatigue Life Prediction of Single Crystal Nickel Based Superalloys

2006 ◽  
Author(s):  
Srikant Ranjan ◽  
Nagaraj K. Arakere
Keyword(s):  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Single Crystal ◽  
Crack Growth ◽  
Stress Intensity Factors ◽  
Mixed Mode ◽  
Life Prediction ◽  
Mixed Mode Loading ◽  
Intensity Factors

A comprehensive fracture mechanics based life prediction methodology is presented for FCC (Face Centered Cubic) single crystal components, based on computation of stress intensity factors (SIFs), and modeling the crystallographic fatigue crack growth process, under mixed-mode loading conditions. The 3D finite element numerical procedure presented for computing SIFs for anisotropic materials under mixed-mode loading is very general, and not just specific to FCC single crystals. Stress intensity factors for a Brazilian Disc (BD) specimen are presented for the crack on the {111} plane in the 〈101〉 and 〈121〉 directions, which represent the primary and secondary slip directions. Variation of SIFs as a function of thickness is also presented. Modeling of the crystallographic fatigue crack growth (FCG) behavior is performed by using the resolved shear stress intensity coefficient (RSSIC), Krss. This parameter is sensitive to the grain orientation and is based on the resolved shear stresses on the slip planes at the crack tip, which is useful in identifying the active crack plane as well as predicting the crack growth direction. A multiaxial fatigue crack driving force parameter, ΔKrss, was quantified, which can be used to predict the FCG rate and hence life in single crystal components subject to mixed mode fatigue loading.

Numerical Simulation of Fatigue Crack Growth for Curved Cracks Emanating from Fastener Holes in Sheets by the MVCCI Method

2006 ◽  
Vol 324-325 ◽  
pp. 863-866
Author(s):  
Holger Theilig ◽  
M. Goth ◽  
Michael Wünsche
Keyword(s):  
Numerical Simulation ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Plane Stress ◽  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Multiple Crack ◽  
2D Structure ◽  
Predictor Corrector

The paper presents the results of a continued study of curved fatigue crack growth in a multiple arbitrarily pre-cracked isotropic sheet under plane stress loading. The predictor-corrector method (PCM) was extended in order to analyse the growth of multiple crack systems in a finite 2D structure. Together with the recently proposed improved modified virtual crack closure integral (MVCCI) method we can obtain accurate SIF values also for interacting cracks, and furthermore we can simulate fatigue crack growth of multiple crack systems in plane sheets under proportional mixed mode loading conditions. As a result, the program PCCS-2D is written to run within ANSYS to simulate interacting curved cracks. In order to check the accuracy and efficiency of the proposed method several example problems are solved. Especially curved cracks emanating from loaded fastener holes in sheets are analysed.

Mixed-mode fatigue crack growth and life prediction of an automotive adhesive bonding system

2018 ◽  
Vol 189 ◽  
pp. 439-450 ◽  
Author(s):  
Qiuren Chen ◽  
Haiding Guo ◽  
Katherine Avery ◽  
Hongtae Kang ◽  
Xuming Su
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Life Prediction ◽  
Adhesive Bonding ◽  
Bonding System

scholarly journals History effect in fatigue crack growth under mixed-mode loading conditions

2009 ◽  
Vol 31 (11-12) ◽  
pp. 1733-1741 ◽  
Author(s):  
P.Y. Decreuse ◽  
S. Pommier ◽  
L. Gentot ◽  
S. Pattofatto
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Loading Conditions ◽  
Mixed Mode Loading ◽  
History Effect
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