Formability and Failure of Automotive Sheet Material AA5754

Abstract

<p>p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Times; color: #202020} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Times; color: #383838} span.s1 {color: #383838} span.s2 {color: #202020} span.s3 {color: #525252}</p> <p>The production of aluminum sheet material can follow two distinct processing routes: the conventional semi-continuous process referred to as direct-chill (or DC) casting and, more recently, the continuous casting process (CC). The variation in processing routes can affect the alloy's microstructure, specifically in terms of particle size distribution and the concentration of alloying elements in solid solution, which can alter the materials mechanical properties. Therefore, the formability and fracture behaviour of AA5754 automotive sheet material in the O-temper, produced via two different processing routes, CC and DC casting, has been investigated by the use of the forming limit diagram (FLD).</p> <p>An in-plane forming test, developed by Marciniak (1973) was used to determine p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Times; color: #202020} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Times; color: #383838} span.s1 {color: #383838} span.s2 {color: #525252} span.s3 {color: #6c6c6c} span.s4 {color: #202020}</p> <p>the intrinsic forming limits of the two materials, while full-field strain mapping based on</p> <p>digital image correlation analysis was used to follow the inhomogeneous plastic flow</p> <p>behaviour. As a result, PLC deformation bands were observed and their influence as</p> <p>geometric imperfections to initiate premature failure was shown to be dependent on the</p> <p>strain path. In addition, post-necking and fracture observations were used to understand</p> <p>the influence of microstructural variations and inhomogeneities on the total ductility of</p> <p>AA5754, in terms of the two processing routes.</p>