Role of elastoplastic analysis under cyclic loading in fatigue crack growth studies
 B Dattaguru
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Linear Elastic Fracture Mechanics (LEFM) has been widely used in the past for fatigue crack growth studies, but this is acceptable only in situations which are within small scale yielding (SSY). In many practical structural components, conditions of SSY could be violated and one has to look for fracture criteria based on elastoplastic analysis. Crack closure phenomenon, one of the most striking discoveries based on inelastic deformations during crack growth, has significant effect on fatigue crack growth rate. Numerical simulation of this phenomenon is computationally intensive and involved but has been successfully implemented. Stress intensity factors and strain energy release rates lose their meaning,Jintegral (or its incremental) values are applicable only in specific situations, whereas alternate path independent integrals have been proposed in the literature for use with elastoplastic fracture mechanics (EPFM) based criteria. This paper presents certain salient features of two independent finite element (numerical) studies of relevance to fatigue crack growth, where elastoplastic analysis becomes significant. These problems can only be handled in the current day computational environment, and would have been only a dream just a few years ago.
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 Title
 Role of elastoplastic analysis under cyclic loading in fatigue crack growth studies
 Journal

Sadhana
Volume 21, Issue 5 , pp 577595
 Cover Date
 19961001
 DOI
 10.1007/BF02744104
 Print ISSN
 02562499
 Online ISSN
 09737677
 Publisher
 Springer India
 Additional Links
 Topics
 Keywords

 Fatigue crack growth
 material nonlinearity
 finite element analysis
 Industry Sectors
 Authors

 B Dattaguru ^{(1)}
 Author Affiliations

 1. Department of Aerospace Engineering, Indian Institute of Science, 560 012, Bangalore, India