Study of an anisotropic polymeric cellular material under compression loading
Study of an anisotropic polymeric cellular material under compression loading
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压缩载荷下各向异性聚合物多孔材料的研究
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
V. Tita
中科院分区：
文献类型：
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作者：
M. F. Júnior;G. P. Soares;R. A. Angélico;R. B. Canto;V. Tita
本文着重研究了多孔材料破坏的微观机制对其唯象响应的影响。多孔材料的大多数应用包括压缩载荷。因此，研究重点是各向异性对循环压缩载荷下多孔材料力学行为的影响。对于本研究，应用数字图像相关（DIC）技术（名为Correli），以及SEM（扫描电子显微镜）图像进行了分析。详细讨论了闭孔硬质聚氯乙烯（PVC）泡沫塑料的实验结果，显示在不同方向上的应力-应变曲线，以及为什么可以假设材料为横观各向同性。此外，本文给出了在不同平面上测得的弹性和塑性泊松比，解释了塑性泊松比趋近于零的原因。讨论了不同方向压缩载荷产生的屈服面以及回弹现象对硬化曲线的影响。
This paper emphasizes the influence of micro mechanisms of failure of a cellular material on its phenomenological response. Most of the applications of cellular materials comprise a compression loading. Thus, the study focuses on the influence of the anisotropy in the mechanical behavior of cellular material under cyclic compression loadings. For this study, a Digital Image Correlation (DIC) technique (named Correli) was applied, as well as SEM (Scanning Electron Microscopy) images were analyzed. The experimental results are discussed in detail for a closed-cell rigid poly (vinyl chloride) (PVC) foam, showing stress-strain curves in different directions and why the material can be assumed as transversely isotropic. Besides, the present paper shows elastic and plastic Poisson's ratios measured in different planes, explaining why the plastic Poisson's ratios approach to zero. Yield fronts created by the compression loadings in different directions and the influence of spring-back phenomenon on hardening curves are commented, also.