Strain hardening exponent role in phenomenological ductile fracture criteria

Strain hardening exponent role in phenomenological ductile fracture criteria

The performance of ductile fracture criteria often depends on the accuracy of material constants identification. Calibration process of three uncoupled phenomenological models was analysed. All of them contain the strain hardening exponent which is related to material plasticity as one of the fractu...

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Bibliographic Details
Published in:European journal of mechanics, A, Solids Vol. 57; pp. 149 - 164
Main Authors: Sebeka, Frantisek, Kubika, Petr, Hulkab, Jiri, Petruskaa, Jindrich
Format: Journal Article
Language:English
Published: Elsevier Masson SAS 01-05-2016
Subjects:
Approximation
Austenitic stainless steels
Criteria
Ductile fracture
Exponents
Fracture mechanics
Heat resistant steels
Mathematical models
Medium carbon steels
Phenomenological criteria
Strain hardening
Strain hardening exponent
Structural steels
Strain hardening exponent
Phenomenological criteria
Ductile fracture
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Summary:The performance of ductile fracture criteria often depends on the accuracy of material constants identification. Calibration process of three uncoupled phenomenological models was analysed. All of them contain the strain hardening exponent which is related to material plasticity as one of the fracture criteria parameter. More flexibility, better approximation of the fracture locus and more convenient shape of the fracture envelope might be reached when the strain hardening exponent is considered as another independent parameter of the fracture criteria in the identification process. Results are illustrated on the example of two structural steels, AISI 316L and AISI 1045, respectively. •Modification of three uncoupled ductile fracture criteria is proposed.•Modified versions lead to better approximation of fracture envelope.•Alternative design of universal biaxial calibration specimen is presented.•Strain based error analysis is discussed.
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ISSN:0997-7538
1873-7285
DOI:10.1016/j.euromechsol.2015.12.006