Measurement of flow stress in hot plane strain compression tests

Abstract

This Good Practice Guide is applicable to hot (isothermal) plane strain compression (PSC) tests at medium to high rates of strain (10^–3 to 10² s^–1) at deformation temperatures below the solidus.

Guidance is provided on appropriate testpiece geometries and methods of verifying the temperature distribution along the length of the testpiece. Flow diagrams are given showing all the steps that are necessary, including the correction factors that need to be applied for breadth spreading of the testpiece; machine origin and compliance, friction effects and deformational heating. Details are given of the calibration procedures that should be followed to provide traceability to the National Measurement System.

The development of the procedure has been supported through experimental tests on type 316 austenitic stainless steel at 1050–1150°C and an aluminium alloy, AA5052, at 300°C to 500°C at strain rates ranging up to 100 s–1.

Technical input to the document has been provided by a steering group comprising academic researchers, representatives of industrial users and producers of a wide range of engineering materials.

Keywords:

• flow stress
• hot plane strain compression test