An investigation using finite element analysis of the effect of swagging in stiffnesses of rubber bushes

Gough J., . An investigation using finite element analysis of the effect of swagging in stiffnesses of rubber bushes. pp. 166-182. ISSN 1511-1768

A common practice in the manufacture of cylindrical rubber bushes is to apply a radial contraction to the outer sleeve or a radial expansion to the inner sleeve after moulding a process known as swaging. This relieves tensile stresses which arise due to differential thermal contraction of the rubber and the sleeves and if a sufficiently large swaging strain is applied this compresses the bush which improves its fatigue life. A Finite Element Analysis (FEA) investigation of the effect of swaging on the small strain stiffnesses of some representative initially stress-free bushes was carried out. The axial and torsional stiffnesses reduce slightly as the swaging strain increases contrary to the effect of dimensional changes alone whereas the radial and tilting stiffnesses increase as predicted from dimensional changes. The reduction in the axial and tilting stiffness was attributed to the effect of compressive stresses introduced by swaging. An approximate estimate of the bush stiffnesses may be obtained from existing theoretical formulae if the original dimensions are used in the calculation of the axial and torsional stiffness and the swaged dimensions are used in the calculation of radial and tilting stiffness.

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Abstract

A common practice in the manufacture of cylindrical rubber bushes is to apply a radial contraction to the outer sleeve or a radial expansion to the inner sleeve after moulding a process known as swaging. This relieves tensile stresses which arise due to differential thermal contraction of the rubber and the sleeves and if a sufficiently large swaging strain is applied this compresses the bush which improves its fatigue life. A Finite Element Analysis (FEA) investigation of the effect of swaging on the small strain stiffnesses of some representative initially stress-free bushes was carried out. The axial and torsional stiffnesses reduce slightly as the swaging strain increases contrary to the effect of dimensional changes alone whereas the radial and tilting stiffnesses increase as predicted from dimensional changes. The reduction in the axial and tilting stiffness was attributed to the effect of compressive stresses introduced by swaging. An approximate estimate of the bush stiffnesses may be obtained from existing theoretical formulae if the original dimensions are used in the calculation of the axial and torsional stiffness and the swaged dimensions are used in the calculation of radial and tilting stiffness.

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Item Type:	Article
AGROVOC Term:	Rubber
AGROVOC Term:	Calibration
AGROVOC Term:	Moulding
AGROVOC Term:	Vulcanization
AGROVOC Term:	Elastomers
AGROVOC Term:	Rubber industry
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23082

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