Paper Title:
Modeling the Role of Microstructure on Shear Instability with Reference to the Formability of Automotive Aluminium Alloys
  Abstract

This paper addresses the effect of microstructure on the formability of aluminium alloys of interest for automotive sheet applications. The bulk of this work has been on the alloy AA5754 – both conventional DC cast alloys and continuous cast alloys made by twin belt casting. It is known that alloys such as these contain Fe as a tramp impurity which results in Fe-based intermetallic particles distributed through microstructure as isolated particles and in stringers aligned along the rolling direction. It is thought that these particles are the cause, both of the reduced ductility that is observed as the Fe level rises, and the relatively poor formability of strip cast alloys, as compared with those made by DC cast. Conventional wisdom suggests that the reduction of ductility is due to the effect of particles as nucleating sites for damage. However, most studies show that these materials are resistant to damage until just before fracture. We now believe that effect is actually related to the development of shear bands in these materials. We present experimental data which supports this conclusion. We then show how the FE models we have developed demonstrate the role of shear instability on fracture and the role played by hard particles. We show how a unit cell approach can be used to incorporate the effect of particle density and morphology on shear localization in a way that includes statistical variability due to microstructural heterogeneity. This leads to a set of constitutive equations in which the parameters are distributed from one region to another. These are then fed into a macroscopic FE model at the level of the specimen or the component in order to determine the effect of microstructural variability on shear instability and ductility.

  Info
Periodical
Materials Science Forum (Volumes 519-521)
Edited by
W.J. Poole, M.A. Wells and D.J. Lloyd
Pages
183-190
DOI
10.4028/www.scientific.net/MSF.519-521.183
Citation
D. S. Wilkinson, X. J. Duan, J. D. Kang, M. K. Jain, J. D. Embury, "Modeling the Role of Microstructure on Shear Instability with Reference to the Formability of Automotive Aluminium Alloys", Materials Science Forum, Vols. 519-521, pp. 183-190, 2006
Online since
July 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Sang Yeob Oh, Hyung Seop Shin
Abstract:The damage behaviors induced in a SiC by a spherical particle impact having a different material and size were investigated. Especially, the...
1321
Authors: O.N. Senkov
Abstract:Semi-amorphous aluminum alloy powders produced by gas atomization were compacted using equal channel angular extrusion (ECAE) in the...
155
Authors: Rong Xin Guo, Hai Ting Xia, Bang Cheng Yang, Le Hui Huang, Feng Yan
Abstract:In this paper, based on the finite element analysis platform ANSYS, the stress field of particle reinforced metal matrix composites (PRMMC)...
555
Authors: Chao Sun, Rujuan Shen, Min Song, Yong Du
Chapter 1: Composites
Abstract:The effects of SiC particle size, volume fraction and tensile strain on the deformation behaviors of SiC particle reinforced Al matrix...
3
Authors: Md Shahanur Hasan, Dennis V. de Pellegrin, Douglas Hargreaves, Richard Clegg
Abstract:Hammers are the key machine element of high-speed hammer mills which lead to the coal pulverisation process. Progressive material loss from...
237