Cyclic compression behavior of epoxy shape memory polymer foam
Cyclic compression behavior of epoxy shape memory polymer foam
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DOI：
10.1016/j.mechmat.2010.01.004
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发表时间：
2010-04-01
影响因子：
3.9
通讯作者：
Arzberger, S. C.
中科院分区：
文献类型：
--
作者：
Di Prima, M. A.;Gall, K.;Arzberger, S. C.
形状记忆聚合物泡沫塑料在航空航天和生物医学等领域具有巨大的应用潜力，但其在循环变形下的热机械行为和损伤响应还不是很清楚。研究了相对密度分别为20%、30%和40%的环氧形状记忆聚合物泡沫塑料的预应变和压缩循环保持时间对循环行为的影响。对于每个相对密度，泡沫在应变控制条件下周期性变形(周期保持时间为0、40和300 S)。在保持时间内，样品完全不受约束；既没有施加应力，也没有施加应变。17%的相对密度泡沫以12微米的分辨率周期性地成像，使用微计算机断层扫描来确定40%、60%或80%工程应变循环变形的细观结构响应。这些扫描提供了全球定量数据以及关于循环变形机制的定性区域信息。单独的Struts被分离并在扫描中跟踪，以定性地显示局部对循环条件的响应。根据泡沫的有限元模型(发表在另一篇文章中)对实验数据进行了讨论，以更好地理解循环变形行为。(C)2010爱思唯尔有限公司。保留所有权利。
Shape memory polymer foams have significant potential in aerospace and biomedical applications, however their thermomechanical behavior and damage response under cyclic deformation are not well understood. This paper investigates effects of pre-strain and hold period between compressive cycles on cyclic behavior of epoxy shape memory polymer foam with relative densities of 20%, 30%, or 40%. For each relative density, foams were cyclically deformed under conditions of strain control with periodic hold times (0, 40, and 300 s). During the hold time the sample was completely unconstrained; neither stress nor a strain was applied. A 17% relative density foam was periodically imaged at 12 mu m resolution using micro-computed tomography scans to determine the mesostructural response to cyclic deformation of 40%, 60%, or 80% engineering strain. These scans provided global quantitative data as well as qualitative regional information on cyclic deformation mechanisms. Individual struts were isolated and tracked across the scans to qualitatively show local response to cyclic conditions. The experimental data are discussed in light of finite element modeling of the foam (published in another article) to better understand the cyclic deformation behavior. (C) 2010 Elsevier Ltd. All rights reserved.