Abstract
The initial use of fracture mechanics to characterize crack growth by fatigue was by Paris. Since then, the application of fracture mechanics to fatigue problems has become routine. In the case of fatigue under mode I loading, the method of analysis, under conditions of constant amplitude and small-scale yielding, is well established. However, apart from the conditions of variable amplitude loading, large scale yielding, and short existing cracks, the procedures for analyzing fatigue under mode II and mixed-mode loading still have not been resolved. A general model, applicable to pure and mixed-mode fatigue crack growth, has been developed based on the unified model. The formulation of the general model is in terms of a power law relationship that is an extension of Paris. The experimental procedures for the measurement of mode II and mixed-mode fatigue crack growth, and verification of the proposed fatigue model, are dealt with herein. The verification has been confined to conditions of constant amplitude and small-scale yielding.
Keywords:
fatigue model, fatigue testing, mixed-mode crack growth, mixed-mode fatigue, mode II crack growth, unified model
Paper ID: JTE12626
DOI: 10.1520/JTE12626
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Author Tamilselvan, T Affiliation Dept of Civil Engineering, National University of Singapore, Singapore
Author Lo, K Affiliation Dept of Civil Engineering, National University of Singapore, Singapore
Author Gong, Y Affiliation Dept of Civil Engineering, National University of Singapore, Singapore
Author Zhao, M Affiliation Centre for Fundamental Studies, Singapore
Author Tamilselvan T, Lo KW, Gong YB, Zhao MM
Title A Model for Mixed-Mode Fatigue
Symposium ,
Committee: on
