Modeling of static and kinetic friction in rubber-pad forming process

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dc.contributor.authorRamezani, Maziar
dc.date.accessioned2015-05-29T07:53:05Z
dc.date.available2015-05-29T07:53:05Z
dc.date.issued2009
dc.description.abstractThe frictional behaviour in sheet metal forming simulations is often taken into account by using a constant coefficient of friction (Coulomb model). This thesis develops static and kinetic friction models which are based on local contact conditions and consider the effect of pressure, velocity, surface roughness and lubricant viscosity on coefficient of friction. The surface asperities were modeled using statistical Gaussian distribution and the behavior of rubber asperities was assumed to be viscoelastic. In lubricated contact surface between die and sheet, the total normal load was assumed to share by the hydrodynamic lifting force and the asperity interacting force. According to developed friction models, at low normal loads the static friction coefficient decreases sharply with increasing normal load and reaches a quite stable level at higher loads. The coefficient of kinetic friction decreases with increasing the sliding velocity and normal load. It was shown theoretically that the coefficient of friction is larger for rougher surfaces, and by increasing the lubricant viscosity, the coefficient of kinetic friction decreases. Furthermore, rubber-pad forming experiments and simulations were performed. The calculated friction curves using the new friction models were implemented in the finite element code ABAQUS/Standard. From the results of simulations it was found that the new friction models have better correlation with experimental results compared to traditional Coulomb friction model, in terms of punch load-stroke curve and thinning prediction. The FE prediction error for maximum punch load is 8% using Coulomb friction model and 5.6% using the kinetic friction model. The error decreases to 4.8% using the static friction model.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/790
dc.language.isoenen_US
dc.subjectKinetic fictionen_US
dc.subjectForming processen_US
dc.titleModeling of static and kinetic friction in rubber-pad forming processen_US
dc.typeThesisen_US
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