Estimation of the Compression Modulus of a Technical Rubber via Cyclic Volumetric Compression Tests

O. Gehrmann, N.H. Kroeger, P. Erren, D. Juhre
2017 Technische Mechanik  
Although, in most material modeling approaches, rubber is said to be incompressible, many rubber compounds are at least slightly compressible. Zimmermann and Stommel (2013) showed that the FE analysis results of hydrostatic loads superimposed with non-hydrostatic loads can significantly vary with a moderate change of the compression modulus. In recent papers, new modeling approaches for the compression modulus are suggested by e.g. (Horgan and Murphy, 2009a,b,c). The underlying material is
more » ... ng material is assumed to be ideal hyperelastic and the validation with experimental data is based on investigations of Rivlin and Saunders (1951). Further experiments regarding the characterization of the compressive behavior of fluoroelastomers (FKM) and hydrogenated nitrile butadiene rubber (HNBR) are documented in Ilseng et al. (2015). In Rajagopal and Saccomandi (2009) and references within, the modulus of shear is given as a function of the hydrostatic pressure, considering the framework of small deformations. Important and well known effects like material softening and inelastic behavior for cyclic loading in case of rubber materials are not investigated in the cited literature. In this work the cyclic behavior of a technical EPDM in volumetric compression is investigated. The insights shall be applied for future modeling approaches of the compression modulus in FE simulations.
doi:10.24352/ub.ovgu-2017-048 fatcat:e5tjcgajqzdpfcrn75abpz2htq