Determination of flow stress and interface friction at elevated temperatures by inverse analysis technique

An inverse analysis technique has been introduced to obtain the flow stress of the bulk and sheet materials at elevated temperatures. The inverse problem is defined as the minimization of the differences between the experimental measurements and the corresponding FEM predictions. As reference materi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials processing technology 2005-12, Vol.170 (1), p.64-70
Main Authors: Cho, Hyunjoong, Altan, Taylan
Format: Article
Language:English
Subjects:
Finite element method (FEM)
Flow stress
Inverse analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An inverse analysis technique has been introduced to obtain the flow stress of the bulk and sheet materials at elevated temperatures. The inverse problem is defined as the minimization of the differences between the experimental measurements and the corresponding FEM predictions. As reference material tests, the ring compression and the modified limiting dome height test (sheet blank with a hole at the center stretched with a hemispherical punch) at elevated isothermal conditions were selected. The friction condition at the tool/workpiece interface is identified from the geometrical changes that occur in deformed samples. It is shown that the developed inverse analysis technique is reliable and can determine the flow stress and friction factor simultaneously from one set of material tests.
ISSN:0924-0136
DOI:10.1016/j.jmatprotec.2005.04.091