Plastic coupling and stress relaxation during nonproportional axial-shear strain-controlled loading

Clifford Jesse Lissenden, III, Steven M. Arnold, Atef F. Saleeb

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A nonproportional strain-controlled load path consisting of two segments was applied to the cobalt-based alloy Haynes 188 at 650°C. The first segment was purely axial; the axial strain was then held constant while the shear strain was increased during the second segment. The alloy exhibited about a 95-percent reduction in axial stress (298 to 15 MPa) during shear straining. This reduction was due primarily to plastic coupling, but timedependent stress relaxation also occurred. A rate-independent plasticity model approximated the stress reduction due to plastic coupling reasonably well, but as expected was unable to account for time-dependent stress relaxation. A viscoplasticity model capable of predicting the interaction between stress relaxation and plastic coupling also predicted the plastic coupling reasonably well. The accuracy of the viscoplastic model is shown to depend greatly upon the set of nonunique material parameters, which must be characterized from a sufficiently large range of load histories.

Original languageEnglish (US)
Pages (from-to)81-87
Number of pages7
JournalJournal of Pressure Vessel Technology, Transactions of the ASME
Volume123
Issue number1
DOIs
StatePublished - Jan 1 2001

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Shear strain
Stress relaxation
Plastics
Viscoplasticity
Plasticity
Cobalt
Loads (forces)

All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "A nonproportional strain-controlled load path consisting of two segments was applied to the cobalt-based alloy Haynes 188 at 650°C. The first segment was purely axial; the axial strain was then held constant while the shear strain was increased during the second segment. The alloy exhibited about a 95-percent reduction in axial stress (298 to 15 MPa) during shear straining. This reduction was due primarily to plastic coupling, but timedependent stress relaxation also occurred. A rate-independent plasticity model approximated the stress reduction due to plastic coupling reasonably well, but as expected was unable to account for time-dependent stress relaxation. A viscoplasticity model capable of predicting the interaction between stress relaxation and plastic coupling also predicted the plastic coupling reasonably well. The accuracy of the viscoplastic model is shown to depend greatly upon the set of nonunique material parameters, which must be characterized from a sufficiently large range of load histories.",
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Plastic coupling and stress relaxation during nonproportional axial-shear strain-controlled loading. / Lissenden, III, Clifford Jesse; Arnold, Steven M.; Saleeb, Atef F.

In: Journal of Pressure Vessel Technology, Transactions of the ASME, Vol. 123, No. 1, 01.01.2001, p. 81-87.

Research output: Contribution to journalArticle

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