Hyperelasticity Model for Finite Element Analysis of Natural and High Damping Rubbers in Compression and Shear

Viscoelastic flow simulation of polytetrafluoroethylene (PTFE) paste extrusion

“…Eq. (8) embodies ideas from both Selvadurai and Yu [11] and Amin et al [10]. The power-law terms come from Amin et al [10].…”

“…The term E denotes the elastic stress due to the fibrillated domains. To select a model for the elastic stress E , we follow the approach used in hyperelasticity [7][8][9][10][11]. When a solid body is subjected to a large deformation, the relationship of positions in deformed and undeformed configurations is described by a deformation gradient tensor F whose eigenvalues λ 1 , λ 2 , and λ 3 are the stretching ratios in the principal directions.…”

“…A conical entry die used in the paste extrusion of PTFE: the left half illustrates the extrusion of PTFE particles and the gradual structure formation through particle fibrillation, whereas the shaded area depicts the axisymmetric domain used in the simulations (reproduced from Patil et al [5]). hyperelastic modeling of rubbers [7][8][9][10][11]. The relative contribution of the two depends on ξ.…”

Parameter Identification Methods for Hyperelastic and Hyper-Viscoelastic Models

“…Yoshida et al presented a constitutive model comprised by an elastoplastic body with a strain-dependent isotropic hardening law and a hyperelastic body with a damage model [21]. Amin et al proposed an improved hyperelastic constitutive equation for rubbers in compression and shear regimes [1,22,23], the parameters in the equation were identified by experiment data and a nonlinear viscous coefficient was introduced to represent the rate-dependent properties. In recent years, a novel testing technique, named nanoidentation, to identify the material parameters for thin polymer layers was developed, a comprehensive review and the realization of the method for hyperelastic and viscoelastic models are presented by Chen et al [24][25][26] In this paper, the Ogden model is taken to characterize the hyperelastic properties of rubber-like materials.…”

Mechanical Characterization of Laminated Rubber Bearings and Their Modeling Approach"

“…A number of experimental and numerical works on different rubber materials (HDR: high damping rubber and NR: natural rubber) have been performed in the past [21][22][23][24][25][26][27]. These works show that the mechanical properties of rubber materials (especially HDR) are dominated by the nonlinear rate-dependence including other inelastic behavior.…”