Study of an anisotropic polymeric cellular material under compression loading

• Main Authors: Mauricio Francisco Caliri Júnior, Gustavo Pazzianotto Soares, Ricardo Afonso Angélico, Rodrigo Bresciani Canto, Volnei Tita
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2012-06-01
• Series: Materials Research
• Subjects: polymeric foam; digital image correlation technique; compression tests
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000300005

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.