Continuous, large strain, tension/compression testing of sheet material

Modeling sheet metal forming operations requires understanding of the plastic behavior of sheet alloys along non-proportional strain paths. Measurement of hardening under reversed uniaxial loading is of particular interest because of its simplicity of interpretation and its application to material e...

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Bibliographic Details
Published in:International journal of plasticity 2005-12, Vol.21 (12), p.2319-2343
Main Authors: Boger, R.K., Wagoner, R.H., Barlat, F., Lee, M.G., Chung, K.
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Anelasticity
Applied sciences
Bauschinger effect
Buckling
Compressive properties
Condensed matter: structure, mechanical and thermal properties
Creep
Devices
Exact sciences and technology
Forming
Fundamental areas of phenomenology (including applications)
Guidelines
Inelasticity (thermoplasticity, viscoplasticity...)
Magnesium
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Mechanical testing
Metals. Metallurgy
Physics
Press forming of metal foils and wires
Production techniques
Room temperature creep
Sheet metal
Solid mechanics
Specimen geometry
Steel
Strain
Structural and continuum mechanics
Tension/compression testing
Zinc
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Summary:Modeling sheet metal forming operations requires understanding of the plastic behavior of sheet alloys along non-proportional strain paths. Measurement of hardening under reversed uniaxial loading is of particular interest because of its simplicity of interpretation and its application to material elements drawn over a die radius. However, the compressive strain range attainable with conventional tests of this type is severely limited by buckling. A new method has been developed and optimized employing a simple device, a special specimen geometry, and corrections for friction and off-axis loading. Continuous strain reversal tests have been carried out to compressive strains greater than 0.20 following the guidelines provided for optimizing the test. The breadth of application of the technique has been demonstrated by preliminary tests to reveal the nature of the Bauschinger effect, room-temperature creep, and anelasticity after strain reversals in commercial sheet alloys.
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2004.12.002