کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1449486 | 988706 | 2008 | 7 صفحه PDF | دانلود رایگان |
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.
Journal: Acta Materialia - Volume 56, Issue 10, June 2008, Pages 2283–2289