State variable approach to deformation phenomena in FCC metals: Dissertation

Simo-Pekka Hannula

Research output: ThesisDissertationCollection of Articles

1 Citation (Scopus)

Abstract

The phenomenological deformation theories for plastic deformation are surveyed, with emphasis placed on the state variable model proposed by Hart. The work hardening behavior of some FCC (face centered cubic) metals is explained in terms of Hart's model and a new work hardening correlation is proposed, based on the separation of athermal and thermal contributions to the work hardening coefficient.The effects of strain aging on the state variable treatment of plastic deformation in stainless steel (SS) are determined and a new treatment based on the evolution of drag stress is suggested.Furthermore, the analysis of strain aging experiments performed on a variety of materials shows that in addition to the hardness parameter, another state variable, i.e. the rate parameter, is generally needed if strain aging is to be accounted for.In addition, it is shown that an indentation load relaxation experiment may potentially be used to obtain pertinent material information for deformation models.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Supervisors/Advisors
  • Lindroos, Veikko, Supervisor, External person
Award date22 Jan 1988
Place of PublicationEspoo
Publisher
Print ISBNs951-38-3058-6
Publication statusPublished - 1988
MoE publication typeG5 Doctoral dissertation (article)

Fingerprint

precipitation hardening
work hardening
plastic deformation
metals
indentation
drag
stainless steels
hardness
coefficients

Keywords

  • plastic deformation
  • plastic flow
  • work hardening
  • strain aging
  • kinetics
  • mathematical models
  • FCC metals
  • stress relaxation tests

Cite this

Hannula, S-P. (1988). State variable approach to deformation phenomena in FCC metals: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Hannula, Simo-Pekka. / State variable approach to deformation phenomena in FCC metals : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1988. 119 p.
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abstract = "The phenomenological deformation theories for plastic deformation are surveyed, with emphasis placed on the state variable model proposed by Hart. The work hardening behavior of some FCC (face centered cubic) metals is explained in terms of Hart's model and a new work hardening correlation is proposed, based on the separation of athermal and thermal contributions to the work hardening coefficient.The effects of strain aging on the state variable treatment of plastic deformation in stainless steel (SS) are determined and a new treatment based on the evolution of drag stress is suggested.Furthermore, the analysis of strain aging experiments performed on a variety of materials shows that in addition to the hardness parameter, another state variable, i.e. the rate parameter, is generally needed if strain aging is to be accounted for.In addition, it is shown that an indentation load relaxation experiment may potentially be used to obtain pertinent material information for deformation models.",
keywords = "plastic deformation, plastic flow, work hardening, strain aging, kinetics, mathematical models, FCC metals, stress relaxation tests",
author = "Simo-Pekka Hannula",
year = "1988",
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series = "Technical Research Centre of Finland. Publications",
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Hannula, S-P 1988, 'State variable approach to deformation phenomena in FCC metals: Dissertation', Doctor Degree, Helsinki University of Technology, Espoo.

State variable approach to deformation phenomena in FCC metals : Dissertation. / Hannula, Simo-Pekka.

Espoo : VTT Technical Research Centre of Finland, 1988. 119 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - State variable approach to deformation phenomena in FCC metals

T2 - Dissertation

AU - Hannula, Simo-Pekka

PY - 1988

Y1 - 1988

N2 - The phenomenological deformation theories for plastic deformation are surveyed, with emphasis placed on the state variable model proposed by Hart. The work hardening behavior of some FCC (face centered cubic) metals is explained in terms of Hart's model and a new work hardening correlation is proposed, based on the separation of athermal and thermal contributions to the work hardening coefficient.The effects of strain aging on the state variable treatment of plastic deformation in stainless steel (SS) are determined and a new treatment based on the evolution of drag stress is suggested.Furthermore, the analysis of strain aging experiments performed on a variety of materials shows that in addition to the hardness parameter, another state variable, i.e. the rate parameter, is generally needed if strain aging is to be accounted for.In addition, it is shown that an indentation load relaxation experiment may potentially be used to obtain pertinent material information for deformation models.

AB - The phenomenological deformation theories for plastic deformation are surveyed, with emphasis placed on the state variable model proposed by Hart. The work hardening behavior of some FCC (face centered cubic) metals is explained in terms of Hart's model and a new work hardening correlation is proposed, based on the separation of athermal and thermal contributions to the work hardening coefficient.The effects of strain aging on the state variable treatment of plastic deformation in stainless steel (SS) are determined and a new treatment based on the evolution of drag stress is suggested.Furthermore, the analysis of strain aging experiments performed on a variety of materials shows that in addition to the hardness parameter, another state variable, i.e. the rate parameter, is generally needed if strain aging is to be accounted for.In addition, it is shown that an indentation load relaxation experiment may potentially be used to obtain pertinent material information for deformation models.

KW - plastic deformation

KW - plastic flow

KW - work hardening

KW - strain aging

KW - kinetics

KW - mathematical models

KW - FCC metals

KW - stress relaxation tests

M3 - Dissertation

SN - 951-38-3058-6

T3 - Technical Research Centre of Finland. Publications

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Hannula S-P. State variable approach to deformation phenomena in FCC metals: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1988. 119 p.