Modeling of anisotropic deformation in superplastic sheet metal stretching

Fadi K. Abu-Farha, Marwan Khraisheh

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Currently available models describing superplastic deformation are mostly based on uniaxial tensile test data and assume isotropic behavior, thus leading to limited predictive capabilities of material deformation and failure. In this work we present a multi-axial microstructure-based constitutive model that describes the anisotropic superplastic deformation within the continuum theory of viscoplasticity with internal variables. The model accounts for micro structural evolution and employs a generalized anisotropic dynamic yield function. The anisotropic yield function can describe the evolution of the initial state of anisotropy through the evolution of unit vectors defining the direction of anisotropy during deformation. The generalized model is then reduced to the plane stress condition to simulate sheet metal stretching in superplastic blow forming using pressurized gas. Different ratios of biaxial stretching were investigated, including the case simulating the uniaxial loading condition, where the model successfully captured the uniaxial experimental data. The model is also used to develop a new forming pressure profile that accounts for anisotropy and microstructural evolution.

Original languageEnglish
Pages (from-to)159-164
Number of pages6
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume127
Issue number1
DOIs
Publication statusPublished - 1 Jan 2005
Externally publishedYes

Fingerprint

metal sheets
Sheet metal
Stretching
Superplastic deformation
Anisotropy
Microstructural evolution
anisotropy
Viscoplasticity
superplastic forming
viscoplasticity
plane stress
Constitutive models
tensile tests
Gases
Microstructure
continuums
microstructure
profiles
gases

ASJC Scopus subject areas

  • Mechanical Engineering
  • Materials Science(all)

Cite this

Modeling of anisotropic deformation in superplastic sheet metal stretching. / Abu-Farha, Fadi K.; Khraisheh, Marwan.

In: Journal of Engineering Materials and Technology, Transactions of the ASME, Vol. 127, No. 1, 01.01.2005, p. 159-164.

Research output: Contribution to journalArticle

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