Analysis of fatigue crack growth in an attachment lug based on the weight function technique and the UniGrow fatigue crack growth model |
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| Affiliation: | 1. University of Waterloo, Department of Mechanical Engineering, Waterloo, ON, Canada N2L 3G1;2. Technical Data Analysis, Inc., 7600A Leesburg Pike, Suite 204, Falls Church, VA 22043, United States;1. Gifu University, Department of Civil Engineering, Gifu, Japan;2. Blocotelha Steel Constructions, Porto de Mós, Portugal;3. Gifu University, Department of Civil Engineering, Gifu, Japan;4. Aarhus University, Department of Civil and Architectural Engineering, Aarhus, Denmark;5. Ecole Polytechnique Fédérale de Lausanne (EPFL), ENAC-RESSLab, Lausanne, Switzerland;1. School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;2. Department of Mechanical Engineering, CEMMPRE, University of Coimbra, Rua Luís Reis Santos, Pólo II, 3030-788 Coimbra, Portugal;1. Aerospace Division, Defence Science and Technology Organisation, 506 Lorimer St, Fishermans Bend 3207, Australia;2. QinetiQ Australia, 210 Kings Way, South Melbourne 3205, Australia |
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| Abstract: | A generalised step-by-step procedure for fatigue crack growth analysis of structural components subjected to variable amplitude loading spectra has been presented. The method has been illustrated by analysing fatigue growth of planar corner crack in an attachment lug made of Al7050-T7451 alloy.Stress intensity factors required for the fatigue crack growth analysis were calculated using the weight function method. In addition, so-called “load-shedding” effect was accounted for in order to determine appropriate magnitudes of the applied stress intensity factors. The rate of the load shedding was determined with the help of the finite element (FE) method by finding the amount of the load transferred through the cracked ligament. The UniGrow fatigue crack growth model, based on the material stress–strain behaviour near the crack tip, has been used to simulate the fatigue crack growth under two variable amplitude loading spectra. The comparison between theoretical predictions and experimental data proved the ability of the UniGrow model to correctly predict fatigue crack growth behaviour of two-dimensional planar cracks under complex stress field and subjected to arbitrary variable amplitude loading. |
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