Modelling grain growth evolution and necking in superplastic blow-forming

J. Lin; F. P.E. Dunne

doi:10.1016/S0020-7403(00)00055-2

Modelling grain growth evolution and necking in superplastic blow-forming

J. Lin (Corresponding Author), F. P.E. Dunne

Research output: Journal article publication › Journal article › Academic research › peer-review

50 Citations (Scopus)

Abstract

A stability analysis is carried out to investigate necking in superplastic materials characterized by the sinh-law constitutive equation ε^p∝sinh(βσ). The effects of load and the strain rate sensitivity parameter β on necking are quantitatively studied and a necking map is obtained for conditions of uniaxial loading. Finite element simulations of a superplastic blow-forming process are carried out in order to investigate both non-uniform thinning and grain size distribution which result from the use of the sinh-law constitutive equation. The pressure cycle required to ensure a target maximum strain rate is not exceeded in the material is obtained. The effects of strain rate and the magnitude of the parameter β on the grain size and through-thickness strain distributions for the formed part are investigated.

Original language	English
Pages (from-to)	595-609
Number of pages	15
Journal	International Journal of Mechanical Sciences
Volume	43
Issue number	3
DOIs	https://doi.org/10.1016/S0020-7403(00)00055-2
Publication status	Published - Dec 2001
Externally published	Yes

Keywords

Superplastic forming
Non-uniform thinning
Grain growth
Gas blow-forming

ASJC Scopus subject areas

Civil and Structural Engineering
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/S0020-7403(00)00055-2

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abstract = "A stability analysis is carried out to investigate necking in superplastic materials characterized by the sinh-law constitutive equation εp∝sinh(βσ). The effects of load and the strain rate sensitivity parameter β on necking are quantitatively studied and a necking map is obtained for conditions of uniaxial loading. Finite element simulations of a superplastic blow-forming process are carried out in order to investigate both non-uniform thinning and grain size distribution which result from the use of the sinh-law constitutive equation. The pressure cycle required to ensure a target maximum strain rate is not exceeded in the material is obtained. The effects of strain rate and the magnitude of the parameter β on the grain size and through-thickness strain distributions for the formed part are investigated.",

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AU - Lin, J.

AU - Dunne, F. P.E.

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N2 - A stability analysis is carried out to investigate necking in superplastic materials characterized by the sinh-law constitutive equation εp∝sinh(βσ). The effects of load and the strain rate sensitivity parameter β on necking are quantitatively studied and a necking map is obtained for conditions of uniaxial loading. Finite element simulations of a superplastic blow-forming process are carried out in order to investigate both non-uniform thinning and grain size distribution which result from the use of the sinh-law constitutive equation. The pressure cycle required to ensure a target maximum strain rate is not exceeded in the material is obtained. The effects of strain rate and the magnitude of the parameter β on the grain size and through-thickness strain distributions for the formed part are investigated.

AB - A stability analysis is carried out to investigate necking in superplastic materials characterized by the sinh-law constitutive equation εp∝sinh(βσ). The effects of load and the strain rate sensitivity parameter β on necking are quantitatively studied and a necking map is obtained for conditions of uniaxial loading. Finite element simulations of a superplastic blow-forming process are carried out in order to investigate both non-uniform thinning and grain size distribution which result from the use of the sinh-law constitutive equation. The pressure cycle required to ensure a target maximum strain rate is not exceeded in the material is obtained. The effects of strain rate and the magnitude of the parameter β on the grain size and through-thickness strain distributions for the formed part are investigated.

KW - Superplastic forming

KW - Non-uniform thinning

KW - Grain growth

KW - Gas blow-forming

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DO - 10.1016/S0020-7403(00)00055-2

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JO - International Journal of Mechanical Sciences

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Modelling grain growth evolution and necking in superplastic blow-forming

Abstract

Keywords

ASJC Scopus subject areas

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