Abstract
A grommet is a representative component that fixes the position of a cable. It is made from hyper-elastic materials (rubber), such as ethylene propylene diene monomer (EPDM). The grommet and cable are conventionally fixed through bonding; however, this method has numerous disadvantages that can be improved through relevant research. To apply a fixing method using the elastic force of EPDM rubber, this paper presents an empirical equation for approximating the bonding force of EPDM grommet parts with a hollow shaft geometry. First, tensile tests and the inverse method were used to approximate the basic mechanical properties. The physical properties were derived through basic tests; furthermore, bonding force tests and the inverse method were used on a grommet with a hollow shaft structure. In addition, the Box–Behnken design of experiments was used to predict the amount of change in the bonding force according to the geometry variables. Finally, this study was validated by comparing the approximation results derived through the design of experiments with the analysis and bonding force test results.
Highlights
A grommet is typically made from hyper-elastic materials, such as the ethylene propylene diene monomer (EPDM), and is used to secure the position of cables embedded in a vehicle [1–7]
design of experiments (DOE) affects the Ogden physical properties applied to the finite element analysis (FEA)
This paper proposed a model for approximating the bonding force of EPDM grommet parts with a hollow shaft geometry
Summary
A grommet is typically made from hyper-elastic materials, such as the ethylene propylene diene monomer (EPDM), and is used to secure the position of cables embedded in a vehicle [1–7]. EPDM materials boast excellent elasticity-recovery properties and a high friction coefficient, they are utilized in research on bonded and dustproof parts [8–10]. The existing grommet parts are joined to cables through a bonding process. Recent studies have investigated a grommet structure that is physically bonded with the cable. The bonding force was enhanced by approximating the physical properties of the parts and modifying their shape through finite element analysis (FEA). The process of approximating EPDM or rubber depends only on the strain–stress properties and does not consider the interaction with other parts
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