On micro-damage in hot metal working. P. 2 Constitutive modelling

• Autorzy: Lin J. , Foster A. D. , Liu Y. , Farrugia D. C. , Dean T. A.
• Języki publikacji: EN

Abstrakty

EN

Damage constitutive equations are formulated to model the evolution of grain boundary and plasticity-induced damage for free-cutting steels under hot forming conditions. During high temperature, high strain rate deformation, material degradation has characteristics of both creep damage at grain boundaries, and ductile damage surrounding hard inclusions. This has been experimentally observed and is reported in the companion paper. This paper describes the development of unified viscoplastic-damage constitutive equations, in which the nucleation and growth of both damage types are considered independently. The effects of deformation rate, temperature, and material microstructure on damage evolution are modelled. The proposed damage evolution equations are combined with a viscoplastic constitutive equation set, enabling the evolution of dislocation hardening, recovery, recrystallisation, grain size, and damage to be modelled. This set of unified, mechanism-based, viscoplastic damage constitutive equations is determined from experimental data of a freemachining steel for the temperature range 1173- 1373 K. The fitted model is then used to predict damage and failure features of the same material tested using a set of interrupted constant strain rate tests. Close agreement between the predicted and experimental results is obtained for all the cases studied.

Słowa kluczowe

EN

creep damage; ductile damage; constitutive equations; hot metal forming; viscoplasticity

PL

obróbka plastyczna; lepkoplastyczność; metal

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Engineering Transactions
• Rocznik: 2007
• Tom: Vol. 55, iss. 1
• Strony: 43--60
• Opis fizyczny: Bibliogr. 17 poz., tab., wykr.

Twórcy

autor

Lin J.

autor

Foster A. D.

autor

Liu Y.

autor

Farrugia D. C.

autor

Dean T. A.

• University of Birmingham, Departament of Manufacturing and Mechanical Engineering, Edgbaston, Birmingham B15 2TT, UK

Bibliografia

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