Fatigue Crack Growth Under Variable Amplitude Loading Through XFEM

Dirik, Haydar
Yalçınkaya, Tuncay
Predicting fatigue crack growth (FCG) rate and path under variable amplitude loading (VAL) is a crucial issue in damage tolerant design commonly used in aerospace industry. The aim of the current study is to predict FCG life under VAL through Extended Finite Element Method (XFEM) and to explicitly illustrate both FCG life and crack propagation. For this purpose an algorithm is developed and integrated in ABAQUS software to analyze 3D crack propagation under VAL using Modified Generalized Willenborg (MGW) retardation model. The results are compared with NASGRO crack propagation software and experimental FCG test data on 7075-T6 aluminum alloy under various over load (OL) and over load-under load (OL-UL) conditions which exhibit a good agreement.
21st European Conference on Fracture (ECF)


Fatigue crack growth analysis models for functionally graded materials
Dağ, Serkan; YILDIRIM, BORA (2006-10-18)
The objective of this study is to develop crack growth analysis methods for functionally graded materials (FGMs) subjected to mode I cyclic loading. The study presents finite elements based computational procedures for both two and three dimensional problems to examine fatigue crack growth in functionally graded materials. Developed methods allow the computation of crack length and generation of crack front profile for a graded medium subjected to fluctuating stresses. The results presented for an elliptica...
Defect acceptability under full-scale fretting fatigue tests for railway axles
Foletti, S.; Beretta, S.; Gurer, G. (2016-05-01)
This paper presents a new approach based on the application of a multiaxial high cycle fatigue criterion together with the use of El-Haddad correction for investigation of fretting fatigue in railway axles. Stress path along the axle-wheel contact, determined by the FE analysis, was implemented into different multiaxial fatigue criteria in order to predict critical sites of nucleation. The equivalent fatigue limit expressed by the applied criterion is compared with the crack size dependent fatigue limit des...
Stochastic approach in reserve estimation
Ülker, Emine Buket; Kök, Mustafa Verşan; Department of Petroleum and Natural Gas Engineering (2004)
Geostatistics and more specifically stochastic modeling of reservoir heterogeneities are being increasingly considered by reservoir analysts and engineers for their potential in generating more accurate reservoir models together with usable measures of spatial uncertainty. Geostatistics provides a probabilistic framework and a toolbox for data analysis with early integration of information. The uncertainty about the spatial distribution of critical reservoir parameters is modeled and transferred all the way...
Peak ground velocity sensitive deformation demands and a rapid damage assessment approach
Akkar, S; Sucuoğlu, Haluk (2003-05-13)
The effect of peak ground velocity (PGV) on the maximum inelastic deformation demand of simple, non-degrading structural systems is studied. Ground motion data sets are assembled for pre-defined ranges of PGV and they are used to conduct nonlinear response history analysis of single-degree-of-freedom (SDOF) systems. The study is focused on short and intermediate periods of vibration (T) and strength reduction factor (R) is used to define the lateral capacity of the structure. As part of the study, a simple ...
Development of a computer program for the analysis of fatigue crack growth
Dalgıç, Ali Murtaza; Bilir, Ömer Gündüz; Kadıoğlu, Suat; Department of Mechanical Engineering (2002)
In this study, a computer program is developed for fatigue crack propagation analysis of metal alloys and random fiber composites. The developed program takes the fatigue crack propagation experiment data in the form of crack length vs. number of cycles from the user. The user also, selects the crack geometry and defines loading conditions of the test specimen. Developed program analyze the experimental data and evaluates crack growth rate and stress intensity range. For the calculated or ready crack growth...
Citation Formats
H. Dirik and T. Yalçınkaya, “Fatigue Crack Growth Under Variable Amplitude Loading Through XFEM,” Catania, ITALY, 2016, vol. 2, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40026.