Creep-rupturing of open-cell foams

✍ Scribed by Ting-Jung Chen; Jong-Shin Huang

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 310 KB
• Volume: 56
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.01.012

✦ Synopsis

A repeating element consisting of four straight and uniform-thickness cell struts in a pentagonal dodecahedron model is employed to analyze theoretically the creep-rupturing of open-cell foams. In the repeating element, the solid making up cell struts is assumed to follow power-law creep and the Monkman-Grant relationship. Consequently, the theoretical expressions for describing the steady-state creep strain rate and creep-rupturing time of open-cell foams are obtained. It is shown that the creep-rupturing of open-cell foams can also be described by the Monkman-Grant relationship. Moreover, the Monkman-Grant parameters m * and B * of open-cell foams depend on their cell structure and those of solid cell struts. The Monkman-Grant parameters determined from the existing experimental results on the creep-rupturing of open-cell aluminum alloy foams are compared to those calculated theoretically from the proposed pentagonal dodecahedron model. The difference between theoretically calculated and empirically determined B * is attributed to some pre-existing cell structural imperfections in open-cell aluminum alloy foams.