Effect of specimen geometry on the accuracy of constitutive relations in a superplastic 5083 aluminum alloy

K. I. Johnson, M. A. Khaleel, C. A. Lavender, S. G. Pitman, J. T. Smith, M. T. Smith, C. H. Hamilton

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

The relationship of force versus cross-head travel for a carefully defined displacement history is commonly used in uniaxial tension tests to evaluate rate sensitive properties of superplastic alloys. The underlying objective is to maintain the strain-rate constant throughout the gauge section of the test specimen. However, finite element simulations of common superplastic tensile specimens predict that actual strain-rates may vary as much as 40% from the uniform value. This trend was experimentally confirmed for a 5083 aluminum alloy by performing a series of interrupted tensile tests. A correlation between experimental and finite element results was made and an improved specimen geometry is presented for uniaxial tests.

Original languageEnglish
Pages (from-to)627-632
Number of pages6
JournalMaterials Science Forum
Volume170-172
DOIs
StatePublished - 1994
Externally publishedYes
EventProceedings of the 1994 International Conference on Superplasticity in Advanced Materials (ICSAM-94) - Moscow, Russia
Duration: May 24 1994May 26 1994

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