Abstract
Elastomers are used in numerous engineering applications such as sealing components, it is therefore important to devise a method that can accurately predict elastomers’ response to load. Many applications that employ the use of these materials subject them to a nonlinear large strain; therefore the simple Hooke’s law is not sufficient to describe their material behaviour. This paper presents an approach to obtain material properties of elastomer under compression loading, based on hyperelastic strain formulation, through experimental test and finite element modelling. The paper focuses on the isotropic incompressible behaviour exhibited by elastomers, and obtains strain energy functions that satisfy the characteristic properties of a hyperelastic model. Data obtained from compression test on a nitrile rubber (NBR) specimen were used as material input into ABAQUS®—a finite element analysis software. A least square fitting technique was used to determine the coefficients of various stable hyperelastic models, based on Drucker’s stability criteria within the software. The strain energy functions obtained concentrate on material parameters which are related to physical quantities of the material molecular network they are subjected to in practical application. The approach benefits from mathematical simplicity, and possesses the property of the deformation mode dependency. Furthermore, a model validation procedure using a step-by-step method for parameters estimation is explained. The work herein is a nonlinear finite element modelling process that leads to an optimal solution and can be employed not only for elastomeric seals, but also for similar engineering assets.
Highlights
Elastomers are very unique visco-hyperelastic materials capable of accommodating large deformation and canHow to cite this paper: Abubakar, I.J., Myler, P. and Zhou, E. (2016) Constitutive Modelling of Elastomeric Seal Material under Compressive Loading
This paper presents a methodology for evaluating the material property of an elastomer subjected to compression loads used in design of mechanical components, with a special interest in elastomeric seals
Finite element modelling is carried out using Neo-Hooke, Ogden and Arruda Boyce material parameters to compare the analytical result with the test result in order to validate the models
Summary
How to cite this paper: Abubakar, I.J., Myler, P. and Zhou, E. (2016) Constitutive Modelling of Elastomeric Seal Material under Compressive Loading. They possess damping characteristics (ability to dissipate energy), high strength especially under shear and compressive deformation, making them suitable for use in design of mechanical components associated with dynamic loading such as elastomeric lip seals. The analysis and modelling of the dynamic response of an elastomeric component under compressive loading are essential and will facilitate the use of computer simulation for designing products that incorporate elastomers subjected to this type of load. This paper presents a methodology for evaluating the material property of an elastomer subjected to compression loads used in design of mechanical components, with a special interest in elastomeric seals. Results from the analysis were compared with the experimental tests and conclusions drawn
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