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Three-dimensional elastic-plastic finite element analysis of small surface cracks

✍ Scribed by G.G. Trantina; H.G. deLorenzi; W.W. Wilkening

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
851 KB
Volume
18
Category
Article
ISSN
0013-7944

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✦ Synopsis

Three-dimensional, elastic and elastic-plastic finite element analysis of small surface cracks was performed. The elastic analysis is in good agreement with other solutions. For a round surface with a radius equal to six times the crack depth, the K at the surface is about 4% higher than the K for a flat surface. The results of the elastic-plastic analyses show a unique variation of the effective K (J-integral) along the crack front with a decrease in K at the surface due to a lack of plane strain constraint and an increase in the effective K at the maximum depth point with increasing plasticity. Similar behavior was observed for a semielliptical crack. Increasing the strain hardening exponent from 10 to 20 produced similar results with slightly higher effective K's for high applied strains. These results are useful in understanding the fracture behavior of small surface cracks.

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