{"title":"A Visco-elastic Model for High-density Cellulose Insulation Materials","authors":"Jonas Engqvist, Per Hard af Segerstad, Birger Bring, Mathias Wallin","volume":68,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":1796,"pagesEnd":1800,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/1278","abstract":"
A macroscopic constitutive equation is developed for a high-density cellulose insulation material with emphasis on the outof- plane stress relaxation behavior. A hypothesis is proposed where the total stress is additively composed by an out-of-plane visco-elastic isotropic contribution and an in-plane elastic orthotropic response. The theory is validated against out-of-plane stress relaxation, compressive experiments and in-plane tensile hysteresis, respectively. For large scale finite element simulations, the presented model provides a balance between simplicity and capturing the materials constitutive behaviour.<\/p>\r\n","references":"[1] P. R\u252c\u00bfatt\u252c\u00bfo and M. Rigdahl, The influence of temperature on the compression behaviour of paper in the thickness direction, Nordic Pulp and Paper Research Journal, vol. 16 no. 3\/2001, pp. 178-182.\r\n[2] N. Stenberg, A model for the through-thickness elasticplastic behaviour\r\nof paper, International Journal of Solids and Structures, vol. 40, 2003, pp. 7483-7498.\r\n[3] L. -O. Nordin and J. Varna, Nonlinear viscoplastic and nonlinear viscoelastic material model for paper fiber composites in compression,\r\nComposites: Part A, vol. 37, 2006, pp. 344-355.\r\n[4] A. Ghaderi and M. Golzar, Material characterization and finite element analysis of a pressboard under press forming, Journal of Materials\r\nProcessing Technology, vol. 209, 2009, pp. 4043-4050.\r\n[5] P. Perzyna, Fundamental problems in viscoplasticity, Advanced Applied\r\nMechanics, vol. 9, 1966, pp. 243-377.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 68, 2012"}