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Compressive behavior of a rolled open-cell aluminum foam
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2018-01-06 , DOI: 10.1016/j.msea.2018.01.015
Vasanth Chakravarthy Shunmugasamy , Bilal Mansoor

In this paper, we investigate compressive behavior of an open-cell 6101 aluminum foam in as-cast and as-rolled conditions. The as-cast foam with a relative density of ρ* = 7% was rolled to create two distinct as-rolled conditions with relative densities of ρ* = 29% and ρ* = 42%, respectively. The quasi-static and high strain rate compressive behavior was studied over a range of strain rates 10−4 /s ≤ ε̇ ≤ 5 × 103/s. It was found that the internal structure of as-rolled foams significantly differs from as-cast foams. Rolling causes plastic bending, stretching, and buckling of individual struts and ligaments, resulting in reduced pore size and an increase in relative density. In as-rolled condition, compressive plateau strength increased with increase in ρ*; it was up to 26 times higher as compared to the as-cast condition. In the range of strain rates considered here, strain rate sensitive compressive behavior was not observed; instead, the intrinsic strain rate sensitivity of parent material governed the compressive behavior in all conditions. Our results demonstrate the feasibility of using conventional rolling as a simple way to modify internal structure and relative density of as-cast foams, thereby enabling mechanical properties more attractive for various structural applications.



中文翻译:

轧制开孔泡沫铝的压缩行为

在本文中,我们研究了铸态和轧制条件下开孔6101铝泡沫的压缩行为。轧制相对密度为ρ* = 7%的铸态泡沫,以创建两种不同的轧制条件,相对密度分别为ρ* = 29%和ρ* = 42%。研究了在10 -4 / s≤应变率范围内的准静态和高应变率压缩行为ε̇≤5×10 3 / s。已经发现,压延泡沫的内部结构与浇铸泡沫明显不同。滚动会导致各个支杆和韧带发生塑性弯曲,拉伸和屈曲,从而导致孔径减小和相对密度增加。在轧制状态下,压缩高原强度随ρ*的增加而增加; 与铸态相比,它高出26倍。在此处考虑的应变率范围内,未观察到应变率敏感的压缩行为。相反,母体材料的固有应变率敏感性决定了在所有条件下的压缩行为。我们的结果证明了使用常规轧制作为修改铸态泡沫的内部结构和相对密度的简单方法的可行性,从而使机械性能对各种结构应用更具吸引力。

更新日期:2018-01-06
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