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Indexed by:期刊论文

Date of Publication:2017-02-01

Journal:INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:88

Issue:9-12

Page Number:3437-3446

ISSN No.:0268-3768

Key Words:Aluminium alloy; Forming limit curves; Major strain; Continuum damage mechanics (CDM); FE simulation

Abstract:Predicting formability of sheet metal in warm forming condition is a challenge since warm forming is a thermo-mechanical process and formability is varied with temperature and strain rate. Current standard forming limit curves (FLCs) which have been established for fixed values of temperatures and strain rates cannot be used directly to predict the formability of sheet metal in warm/hot forming processes. In this paper, a series of experiment were carried out to establish FLCs for AA5754 at a temperature range of 200-300 A degrees C and a forming rate of 20-300 mm/s using Argus system. Based on a set of continuum damage mechanics (CDM)-based theories, the constitutive model is implemented in Ls-Dyna user subroutine. Finite element (FE) result of strain distribution was compared with the experimental result from Argus system in terms of different strain paths. FE results have a good agreement with the experimental results, which indicates that the FE model developed can be used to predict formability for warm forming process.