Effect of strain rate and load orientation on cyclic response of anisotropic polyurethane foam

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2022-04-13 DOI:10.1177/02624893221084895
Dorra Ben Abdeljelil, S. Chatti, Raja O Ahmed Ben Ali
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引用次数: 1

Abstract

Anisotropic cellular materials, such as polymeric foams, play an important role in structures subjected to cyclic loadings. The present paper provides an experimental investigation of the mechanical behavior of an anisotropic polyurethane foam subjected to cyclic compressive loadings under two perpendicular orientations: the rising and perpendicular directions. The foam samples are loaded under three different strain rates and various deformations. The experimental results are presented in terms of elasticity modulus, maximal compressive stress, effective energy absorption capacity, and residual strain. It is proved that the investigated polyurethane foam presents a macroscopic mechanical anisotropy caused by microscopic cell elongation in the foaming direction. Moreover, it is demonstrated that the mechanical behavior of the foam is fully influenced by both deformation rates and imposed strains. The experimental stress–strain curves are modelized using an empirical model considering an adjustable modulus of elasticity. The analytical results show a good agreement with the experiments.
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应变速率和载荷方向对各向异性聚氨酯泡沫循环响应的影响
各向异性细胞材料,如聚合物泡沫,在受循环载荷的结构中起着重要的作用。本文研究了各向异性聚氨酯泡沫材料在垂直方向和垂直方向下循环压缩载荷作用下的力学行为。泡沫试样在三种不同的应变速率和不同的变形下加载。实验结果包括弹性模量、最大压应力、有效能量吸收能力和残余应变。结果表明,所研究的聚氨酯泡沫在发泡方向上表现出微观细胞伸长引起的宏观力学各向异性。此外,研究表明,泡沫的力学行为完全受变形速率和施加应变的影响。实验应力-应变曲线采用考虑弹性模量可调的经验模型进行建模。分析结果与实验结果吻合较好。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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