Interpretation of Plasticity Effects Using the CJP Crack Tip Field Model

M. Neil James; Colin J. Christopher; Francisco Alberto Díaz Garrido; Jose M. Vasco-Olmo; Toshifumi Kakiuchi; Eann A. Patterson

doi:10.4028/www.scientific.net/SSP.258.117

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Interpretation of Plasticity Effects Using the CJP Crack Tip Field Model

Abstract:

This paper will outline the development of a model of crack tip fields that represents an innovation in incorporate the influences on crack tip displacement and stress fields of the zone of local plasticity that envelops a growing fatigue crack. The model uses assumed distributions of elastic stresses induced at the elastic-plastic boundary via wake contact and compatibility requirements, and defines a set of modified elastic stress intensity factors to characterise the crack stress or displacement tip field. In particular, recent work will be presented that compares the interpretation of plasticity-induced shielding obtained from trends observed in K_R and K_F with values of so-called ‘crack closure’ obtained via traditional strain gauge determination.

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Periodical:

Solid State Phenomena (Volume 258)

Pages:

117-124

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.258.117

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Online since:

December 2016

Authors:

M. Neil James*, Colin J. Christopher, Francisco Alberto Díaz Garrido, Jose M. Vasco-Olmo, Toshifumi Kakiuchi, Eann A. Patterson

Keywords:

Crack Tip Displacement Field, Crack Tip Stress Field, Plastic Zone Shape, Plastic Zone Size, Plasticity-Induced Shielding, Stress Intensity Factor, T-Stress

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* - Corresponding Author

References

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