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http://dx.doi.org/10.7734/COSEIK.2016.29.5.437

Temperature-Dependent Viscoplastic-Damage Constitutive Model for Nonlinear Compressive Behavior of Polyurethane Foam  

Lee, Jeong-Ho (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Kim, Seul-Kee (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Lee, Jae-Myung (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.29, no.5, 2016 , pp. 437-445 More about this Journal
Abstract
Recently, polyurethane foam has been used in various industry fields to preserve temperature environment of structures, and a wide range of loads from the static to the dynamic are imposed on the material during a life period. The biggest characteristic of polyurethane foam is porosity as being polymeric material, and it is generally known that insulation performance of the material strongly depends on internal void size. In addition, polyurethane foam's mechanical behavior has high dependence on strain rate and temperature as well as being highly non-linear ductile for compression. In the non-linear compressive behavior, volume fraction of voids and elastic modulus decrease as strain increases. Therefore, in this study, temperature-dependent viscoplastic-damage constitutive model was developed to describe the non-linear compressive behavior with the aforementioned features of polyurethane foam.
Keywords
polyurethane foam; compressive behavior dependent on strain rate and temperature; constitutive model; ABAQUS user-defined material subroutine;
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