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Evaluation of the derivatives of the strain energy function with respect to strain invariants for carbon black–filled EPDM
Author(s) -
Kakavas P. A.
Publication year - 2001
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10857
Subject(s) - materials science , carbon black , ogden , strain (injury) , elastomer , composite material , strain energy , hyperelastic material , stress–strain curve , function (biology) , stress (linguistics) , natural rubber , thermodynamics , deformation (meteorology) , physics , finite element method , medicine , linguistics , philosophy , evolutionary biology , biology
Abstract The experimental and theoretical investigation of the mechanical properties of an ethylene‐propylene‐diene terpolymer (EPDM) elastomer reinforced with carbon black was examined. The material constants of the testing material were determined by plotting the stress‐strain experimental curve in a reduced stress versus the inverse stretch diagram. The Ogden equation was used for the strain energy function to fit uniaxial experimental stress‐strain curves. The characterization of the material was examined using the contour maps of ∂W/∂I 1 and ∂W/∂I 2 , i.e., of the derivatives of strain energy function with respect to strain invariants I 1 and I 2 .