Compressive deformation of Rohacell foams: Effects of strain rate and temperature
Compressive deformation of Rohacell foams: Effects of strain rate and temperature
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DOI：
10.1016/j.ijimpeng.2012.07.010
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发表时间：
2013-01-01
影响因子：
5.1
通讯作者：
Petrinic, N.
中科院分区：
文献类型：
--
作者：
Arezoo, S.;Tagarielli, V. L.;Petrinic, N.
对四种不同密度的Rohacell泡沫进行了单轴压缩实验。实验探索了对施加的应变速率（在10（-3）至5 × 10（3）s（-1）的范围内）和温度（203-473 K）的响应的灵敏度。压缩破坏应力通常随应变速率的增加和温度的降低而增加;然而，这种趋势在非常低的温度或非常高的应变速率下被反转。这种行为主要是由于母体聚合物的脆化，但也与泡沫微观结构的细节有关。时间-温度叠加映射的温度敏感性的泡沫材料的应变率依赖。提供了一个简单的设计公式来预测泡沫刚度作为温度和相对密度的函数。(C)2012爱思唯尔有限公司保留所有权利。
Uniaxial compression experiments have been performed on four different densities of Rohacell foam. The experiments explored the sensitivity of the response to the imposed strain rate (in the range 10(-3) to 5 x 10(3) s(-1)) and temperature (203-473 K). The compressive collapse stress is generally found to increase with increasing strain rate and decreasing temperature; however this tendency is inverted at very low temperatures or very high strain rates. This behaviour is mainly due to embrittlement of the parent polymer but is also related to the details of the foams' microstructures. Time-temperature superposition is employed to map the temperature sensitivity of the foams to their strain rate dependence. A simple design formula is provided to predict the foam stiffness as a function of temperature and relative density. (C) 2012 Elsevier Ltd. All rights reserved.