Contact and friction in systems with fibre reinforced elastomers

Natalia Valentina Rodriguez Pareja

Research output: ThesisPhD Thesis - Research UT, graduation UT

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Abstract

The tribological behaviour (contact and friction) of systems that include fibre reinforced elastomers is studied in this thesis. The elastomer composite is considered to behave as a viscoelastic anisotropic continuum material. In the defined tribo-system, the most influential friction mechanism is adhesion. Therefore the size of the contact area during sliding and the shear stresses in the contact area are studied. A contact model that considered the viscoelasticity of the elastomer and the anisotropy caused by the directionality of the fibres has been developed to describe the size of the contact area in the static case. To obtain the size of the contact area during sliding, sliding experiments were performed and from these results a function that relates the static and dynamic contact area was proposed. Due to sliding interaction the surface of the elastomer is modified, this modification of the surface is called a tribo-generated surface layer. This layer has poor mechanichal properties when compared to the bulk of the elastomer and influences the tribological behaviour of tribo-systems with elastomers. The friction is considered to be caused by shearing this layer. The shear stresses occurring in the tribo-generated surface layer during sliding contact are modelled using a shear stress model which considers viscoelastic behaviour of the interfacial layer. The viscoelastic behaviour was modelled by a Maxwell model of two elements. Properties of the surface layer are obtained from indentation and friction measurements. The friction model corresponds closely with friction experiments for the unreinforced and reinforced EPDM at different sliding velocities. In the case of the reinforced EPDM a lower coefficient of friction was found, this is the result of a decrease on the contact area due to the reinforcement.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Schipper, Dirk J., Supervisor
  • Masen, M.A., Advisor
Award date26 Oct 2012
Place of PublicationEnschede
Publisher
Print ISBNs9789036534543
DOIs
Publication statusPublished - 26 Oct 2012

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Elastomers
Friction
Fibers
Shear stress
Viscoelasticity
Shearing
Indentation
Reinforcement
Anisotropy
Adhesion
Experiments
Composite materials

Keywords

  • IR-82178
  • METIS-288871
  • Onderzoek van algemene industriele aardMechanical engineering and technologyProduktie- en procestechnieken

Cite this

Rodriguez Pareja, Natalia Valentina. / Contact and friction in systems with fibre reinforced elastomers. Enschede : University of Twente, 2012. 146 p.
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abstract = "The tribological behaviour (contact and friction) of systems that include fibre reinforced elastomers is studied in this thesis. The elastomer composite is considered to behave as a viscoelastic anisotropic continuum material. In the defined tribo-system, the most influential friction mechanism is adhesion. Therefore the size of the contact area during sliding and the shear stresses in the contact area are studied. A contact model that considered the viscoelasticity of the elastomer and the anisotropy caused by the directionality of the fibres has been developed to describe the size of the contact area in the static case. To obtain the size of the contact area during sliding, sliding experiments were performed and from these results a function that relates the static and dynamic contact area was proposed. Due to sliding interaction the surface of the elastomer is modified, this modification of the surface is called a tribo-generated surface layer. This layer has poor mechanichal properties when compared to the bulk of the elastomer and influences the tribological behaviour of tribo-systems with elastomers. The friction is considered to be caused by shearing this layer. The shear stresses occurring in the tribo-generated surface layer during sliding contact are modelled using a shear stress model which considers viscoelastic behaviour of the interfacial layer. The viscoelastic behaviour was modelled by a Maxwell model of two elements. Properties of the surface layer are obtained from indentation and friction measurements. The friction model corresponds closely with friction experiments for the unreinforced and reinforced EPDM at different sliding velocities. In the case of the reinforced EPDM a lower coefficient of friction was found, this is the result of a decrease on the contact area due to the reinforcement.",
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Contact and friction in systems with fibre reinforced elastomers. / Rodriguez Pareja, Natalia Valentina.

Enschede : University of Twente, 2012. 146 p.

Research output: ThesisPhD Thesis - Research UT, graduation UT

TY - THES

T1 - Contact and friction in systems with fibre reinforced elastomers

AU - Rodriguez Pareja, Natalia Valentina

PY - 2012/10/26

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N2 - The tribological behaviour (contact and friction) of systems that include fibre reinforced elastomers is studied in this thesis. The elastomer composite is considered to behave as a viscoelastic anisotropic continuum material. In the defined tribo-system, the most influential friction mechanism is adhesion. Therefore the size of the contact area during sliding and the shear stresses in the contact area are studied. A contact model that considered the viscoelasticity of the elastomer and the anisotropy caused by the directionality of the fibres has been developed to describe the size of the contact area in the static case. To obtain the size of the contact area during sliding, sliding experiments were performed and from these results a function that relates the static and dynamic contact area was proposed. Due to sliding interaction the surface of the elastomer is modified, this modification of the surface is called a tribo-generated surface layer. This layer has poor mechanichal properties when compared to the bulk of the elastomer and influences the tribological behaviour of tribo-systems with elastomers. The friction is considered to be caused by shearing this layer. The shear stresses occurring in the tribo-generated surface layer during sliding contact are modelled using a shear stress model which considers viscoelastic behaviour of the interfacial layer. The viscoelastic behaviour was modelled by a Maxwell model of two elements. Properties of the surface layer are obtained from indentation and friction measurements. The friction model corresponds closely with friction experiments for the unreinforced and reinforced EPDM at different sliding velocities. In the case of the reinforced EPDM a lower coefficient of friction was found, this is the result of a decrease on the contact area due to the reinforcement.

AB - The tribological behaviour (contact and friction) of systems that include fibre reinforced elastomers is studied in this thesis. The elastomer composite is considered to behave as a viscoelastic anisotropic continuum material. In the defined tribo-system, the most influential friction mechanism is adhesion. Therefore the size of the contact area during sliding and the shear stresses in the contact area are studied. A contact model that considered the viscoelasticity of the elastomer and the anisotropy caused by the directionality of the fibres has been developed to describe the size of the contact area in the static case. To obtain the size of the contact area during sliding, sliding experiments were performed and from these results a function that relates the static and dynamic contact area was proposed. Due to sliding interaction the surface of the elastomer is modified, this modification of the surface is called a tribo-generated surface layer. This layer has poor mechanichal properties when compared to the bulk of the elastomer and influences the tribological behaviour of tribo-systems with elastomers. The friction is considered to be caused by shearing this layer. The shear stresses occurring in the tribo-generated surface layer during sliding contact are modelled using a shear stress model which considers viscoelastic behaviour of the interfacial layer. The viscoelastic behaviour was modelled by a Maxwell model of two elements. Properties of the surface layer are obtained from indentation and friction measurements. The friction model corresponds closely with friction experiments for the unreinforced and reinforced EPDM at different sliding velocities. In the case of the reinforced EPDM a lower coefficient of friction was found, this is the result of a decrease on the contact area due to the reinforcement.

KW - IR-82178

KW - METIS-288871

KW - Onderzoek van algemene industriele aardMechanical engineering and technologyProduktie- en procestechnieken

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