Abstract
A new constitutive equation for the Portevin-LeChatelier effect has been proposed. A main feature of the equation is the introduction of an internal stress Yir which is supposed to be decreased with strain (work softening) and increased with time (age hardening). Yir is introduced in order to explain the negative rate sensitivity (n.r.s) of the flow stress. Another feature of the theory is that all the parameters used in the equation can be obtained by macroscopic experiments. The results of computer simulation based on the theory showed that the simulated values of the Luders strain, the strain rate, the stress drop and its rate agree quantitatively with the experimental data. Moreover, the simulation could explain the peculiar behavior of Luders deformation, namely, the fast and slow deformation, which was observed in the tensile test carried out at the moderate tensile speed of 3×10-3 s-1.
| Original language | English |
|---|---|
| Pages (from-to) | 1172-1180 |
| Number of pages | 9 |
| Journal | Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals |
| Volume | 64 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Jan 1 2000 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry
Cite this
New constitutive equation for the Portevin-LeChatelier effect based on work-softening model. / Onodera, Ryuta; Morikawa, Tatsuya.
In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 64, No. 12, 01.01.2000, p. 1172-1180.Research output: Contribution to journal › Article
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TY - JOUR
T1 - New constitutive equation for the Portevin-LeChatelier effect based on work-softening model
AU - Onodera, Ryuta
AU - Morikawa, Tatsuya
PY - 2000/1/1
Y1 - 2000/1/1
N2 - A new constitutive equation for the Portevin-LeChatelier effect has been proposed. A main feature of the equation is the introduction of an internal stress Yir which is supposed to be decreased with strain (work softening) and increased with time (age hardening). Yir is introduced in order to explain the negative rate sensitivity (n.r.s) of the flow stress. Another feature of the theory is that all the parameters used in the equation can be obtained by macroscopic experiments. The results of computer simulation based on the theory showed that the simulated values of the Luders strain, the strain rate, the stress drop and its rate agree quantitatively with the experimental data. Moreover, the simulation could explain the peculiar behavior of Luders deformation, namely, the fast and slow deformation, which was observed in the tensile test carried out at the moderate tensile speed of 3×10-3 s-1.
AB - A new constitutive equation for the Portevin-LeChatelier effect has been proposed. A main feature of the equation is the introduction of an internal stress Yir which is supposed to be decreased with strain (work softening) and increased with time (age hardening). Yir is introduced in order to explain the negative rate sensitivity (n.r.s) of the flow stress. Another feature of the theory is that all the parameters used in the equation can be obtained by macroscopic experiments. The results of computer simulation based on the theory showed that the simulated values of the Luders strain, the strain rate, the stress drop and its rate agree quantitatively with the experimental data. Moreover, the simulation could explain the peculiar behavior of Luders deformation, namely, the fast and slow deformation, which was observed in the tensile test carried out at the moderate tensile speed of 3×10-3 s-1.
UR - http://www.scopus.com/inward/record.url?scp=0034472752&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034472752&partnerID=8YFLogxK
U2 - 10.2320/jinstmet1952.64.12_1172
DO - 10.2320/jinstmet1952.64.12_1172
M3 - Article
AN - SCOPUS:0034472752
VL - 64
SP - 1172
EP - 1180
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 12
ER -