Computer simulation of Portevin-LeChatelier effect based on strain softening model

R. Onodera, Tatsuya Morikawa, K. Higashida

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A new phenomenological theory for the Portevin-LeChatelier effect is proposed. The theory is based on an unknown internal stress Yir which decreases with strain (work softening) and increases with time (age hardening). Yir is introduced to satisfy the negative rate sensitivity (n.r.s.) of flow stress and it is supposed to be due to very fine clusters which are cut by dislocation and restored by solute atom diffusion. Almost all constants used in the theory can be determined by tensile test. The results of simulation can explain the effect of temperature, strain and strain rate on the onset strain of P-L effect. Especially, the model can explain the no-occurrence of P-L effect under the n.r.s. condition in aged Al-Cu alloy, and the quantity of transition strain in tensile test in which the crosshead speed is abruptly changed.

Original languageEnglish
Pages (from-to)533-536
Number of pages4
JournalMaterials Science and Engineering A
Volume234-236
Publication statusPublished - Aug 30 1997

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plastic deformation
computerized simulation
Computer simulation
tensile tests
work softening
precipitation hardening
Age hardening
Plastic flow
strain rate
residual stress
Strain rate
Residual stresses
solutes
occurrences
Atoms
atoms
simulation
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Computer simulation of Portevin-LeChatelier effect based on strain softening model. / Onodera, R.; Morikawa, Tatsuya; Higashida, K.

In: Materials Science and Engineering A, Vol. 234-236, 30.08.1997, p. 533-536.

Research output: Contribution to journalArticle

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