Fatigue Lifetime Prediction Methodology Of
Rubber Components
Author(s)
C. S. Woo & W. D. Kim
Abstract
Interest in the useful lifetime for rubber components increases where the
extension of a warranty period is considered. Fatigue analysis and lifetime
evaluation are very important in design procedures to assure the safety and
reliability of automotive rubber components. The fatigue lifetime prediction
methodology of vulcanized natural rubber was proposed by incorporating the
finite element analysis and fatigue damage parameter determined from a fatigue
test. Nonlinear finite element analyses of the 3-dimensional dumbbell specimen
and rubber component were performed using the Ogden hyper-elastic material
model determined from the tensile, shear and biaxial tension tests of the natural
rubber, and resulted in relationships between displacement and Green-Lagrange
strain for both the dumbbell specimen and the rubber component. Fatigue life
tests were performed using the 3-dimensional dumbbell specimen at different
levels of mean displacement. The fatigue life curve of the natural rubber
represented by the maximum Green-Lagrange strain was determined from the
finite element analysis and displacement-controlled fatigue test of the dumbbell
specimen. Predicted fatigue lives of the rubber engine mount agreed fairly well
with the experimental fatigue lives.
Keywords: rubber component, fatigue test, fatigue life, finite element analysis,
maximum Green-Lagrange strain, life prediction.
1 Introduction
Rubber’s ability to withstand very large strains without permanent deformation
or fracture makes it ideal for many applications. Applications include vibration
isolators, seals and structural bearings, to name a few. These applications impose
Keywords
rubber component, fatigue test, fatigue life, finite element analysis,maximum Green-Lagrange strain, life prediction.
Related Book
Other papers in this volume
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