A New Horizon for Barreling Compression Test: Exponential Profile Modeling. Issue 11 (29th June 2017)

• Record Type: Journal Article
• Authors: Fardi, Mehdi; Abraham, Ralph; Hodgson, Peter D; Khoddam, Shahin
• Is Part Of: Advanced engineering materials. Volume 19:Issue 11(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-06-29
• Subjects: analytical solution -- constitutive behavior -- dynamic recrystallization -- friction factor -- hot characterization -- hot compression test; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201700328
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Exponential Profile Model (EPM) has been recently proposed to interpret barreling compression test's (BCT) data. A basic solution of EPM enables estimation of friction factor and to calculate distributions of strain rate (and strain) in the sample. These critical pre‐requisites allow to identify material's flow behavior and to indirectly measure static, dynamic, and meta‐dynamic recrystallization properties of the material based on the behavior. In this work, EPM's basic solution is employed in a fixed friction factor mode, the model is assessed and its potentials are outlined. The assessment includes comparing EPM's sample solutions with two reference solutions. The references are a non‐isothermal finite element model of BCT and the commonly used solution of the test; Cylindrical Profile Model (CPM). It is shown that despite variations of strain, strain rate, and temperature in Al1050 and AISI 304 stainless steel BCT samples, EPM's solutions agree reasonably well with the finite element solutions. This is particularly true for effective strains bellow 0.7 and friction factors bellow 0.2. It is concluded that EPM presented a far more reliable solution than CPM. Abstract : A new analytical model for barreling compression test (Top) is introduced. The model (EPM), proves to be far more reliable than the existing models such as Cylindrical Profile Model. EPM relies on the initial and deformed geometry of the test sample (Top) and a new velocity filed (bottom) to identify the test's friction factor and its strain distribution.