Abstract
The most important characteristic of superplastic materials is the high sensitivity of flow stress to deformation rate. In general, a constant strain rate sensitivity index value is usually used for calibrating models describing superplastic deformation. However, experimental results indicate that the strain rate sensitivity index depends on strain rate, strain and does not remain constant during deformation. In this work, the effects of strain rate sensitivity variation on the stability of deformation during superplastic forming are examined using finite element simulations in conjunction with a microstructure-based constitutive model. The model is experimentally calibrated and validated for the AZ31 magnesium alloy. The results clearly show the importance of accounting for the variation of strain rate sensitivity in modeling and simulating superplastic forming.
| Original language | English |
|---|---|
| Pages (from-to) | 189-192 |
| Number of pages | 4 |
| Journal | Journal of Materials Processing Technology |
| Volume | 191 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 1 Aug 2007 |
| Externally published | Yes |
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Keywords
- Deformation stability
- Finite element analysis
- Strain rate sensitivity
- Superplastic forming (SPF)
ASJC Scopus subject areas
- Materials Science(all)
- Computer Science Applications
- Modelling and Simulation
- Ceramics and Composites
- Metals and Alloys
- Industrial and Manufacturing Engineering
Cite this
The effect of strain rate sensitivity evolution on deformation stability during superplastic forming. / Nazzal, M. A.; Khraisheh, Marwan; Abu-Farha, F. K.
In: Journal of Materials Processing Technology, Vol. 191, No. 1-3, 01.08.2007, p. 189-192.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The effect of strain rate sensitivity evolution on deformation stability during superplastic forming
AU - Nazzal, M. A.
AU - Khraisheh, Marwan
AU - Abu-Farha, F. K.
PY - 2007/8/1
Y1 - 2007/8/1
N2 - The most important characteristic of superplastic materials is the high sensitivity of flow stress to deformation rate. In general, a constant strain rate sensitivity index value is usually used for calibrating models describing superplastic deformation. However, experimental results indicate that the strain rate sensitivity index depends on strain rate, strain and does not remain constant during deformation. In this work, the effects of strain rate sensitivity variation on the stability of deformation during superplastic forming are examined using finite element simulations in conjunction with a microstructure-based constitutive model. The model is experimentally calibrated and validated for the AZ31 magnesium alloy. The results clearly show the importance of accounting for the variation of strain rate sensitivity in modeling and simulating superplastic forming.
AB - The most important characteristic of superplastic materials is the high sensitivity of flow stress to deformation rate. In general, a constant strain rate sensitivity index value is usually used for calibrating models describing superplastic deformation. However, experimental results indicate that the strain rate sensitivity index depends on strain rate, strain and does not remain constant during deformation. In this work, the effects of strain rate sensitivity variation on the stability of deformation during superplastic forming are examined using finite element simulations in conjunction with a microstructure-based constitutive model. The model is experimentally calibrated and validated for the AZ31 magnesium alloy. The results clearly show the importance of accounting for the variation of strain rate sensitivity in modeling and simulating superplastic forming.
KW - Deformation stability
KW - Finite element analysis
KW - Strain rate sensitivity
KW - Superplastic forming (SPF)
UR - http://www.scopus.com/inward/record.url?scp=34249903635&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34249903635&partnerID=8YFLogxK
U2 - 10.1016/j.jmatprotec.2007.03.097
DO - 10.1016/j.jmatprotec.2007.03.097
M3 - Article
AN - SCOPUS:34249903635
VL - 191
SP - 189
EP - 192
JO - Journal of Materials Processing Technology
JF - Journal of Materials Processing Technology
SN - 0924-0136
IS - 1-3
ER -