Computational analysis of PTFE shaft seals

Kletschkowski, Thomas; Schomburg, U.; Bertram, Albrecht

doi:10.1016/j.commatsci.2004.09.027

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The flexible stamp is in this case made of polytetrafluoroethylene (PTFE) which due to its thermal resistance is suitable for NIL which normally is performed at elevated temperatures (when applying a non-UV curing resist). The material behaviour has to a large extend been shown in the literature, and different corresponding constitutive models have been proposed [154][155][156] These different contributions are in overall agreement on how the PTFE material by a 1D rheological representation can be described. In the present work, the overall approach is to include the viscoelastic behaviour represented by a Zener body 155 by a modified version of Hooke's law represented by the elastic stiffness tensor…”

Section: -63mentioning

confidence: 77%

Multiphysics modelling of manufacturing processes: A review

Jabbari

Baran

Mohanty³

et al. 2018

Advances in Mechanical Engineering

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Numerical modelling is increasingly supporting the analysis and optimization of manufacturing processes in the production industry. Even if being mostly applied to multistep processes, single process steps may be so complex by nature that the needed models to describe them must include multiphysics. On the other hand, processes which inherently may seem multiphysical by nature might sometimes be modelled by considerably simpler models if the problem at hand can be somehow adequately simplified. In the present article, examples of this will be presented. The cases are chosen with the aim of showing the diversity in the field of modelling of manufacturing processes as regards process, materials, generic disciplines as well as length scales: (1) modelling of tape casting for thin ceramic layers, (2) modelling the flow of polymers in extrusion, (3) modelling the deformation process of flexible stamps for nanoimprint lithography, (4) modelling manufacturing of composite parts and (5) modelling the selective laser melting process. For all five examples, the emphasis is on modelling results as well as describing the models in brief mathematical details. Alongside with relevant references to the original work, proper comparison with experiments is given in some examples for model validation.

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Section: -63mentioning

confidence: 77%

Multiphysics modelling of manufacturing processes: A review

Jabbari

Baran

Mohanty³

et al. 2018

Advances in Mechanical Engineering

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show abstract

“…The polymer lip seals, which are strained as a result of shaft mounting, have received a great deal of attention as they are often used in mechanical engineering. A lot of studies and simulations have been developed and presented, in which strain and stress in shaft-seated seals have been determined [11,12,13,14]. Their aim was to obtain the possibility of forecasting frictional resistance and durability of seals.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Kujawa¹,

Kowalewski²,

Wieleba³

2019

Polymers

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Polymer materials are increasingly being used for sliding machine elements due to their numerous advantages. They are used even where they are deformed and in such a state that they interact frictionally, e.g., in machine hydraulics or lip seals. Few publications deal with the influence of deformation, which is the effect of, e.g., assembly on tribological properties of polymeric material. This deformation can reach up to ε ≈ 20% and is achieved without increasing the temperature of the polymer material. The paper presents the results of investigations in which high-density polyethylene (PE-HD) was maintained in deformation by means of a special grip (holder). The wear of the sample was significantly higher than that of the undeformed sample. This effect persisted even after partial relaxation of the stress in the sample after 24 h. Additional investigations were carried out to explain the obtained results. There were the microscopic observations of the surface after friction, measurements of microhardness, and surface free energy. Changes in the value of surface free energy and a significant decrease in microhardness with deformation under tension were observed. Deformed materials have a different surface appearance after friction and a different size and form of wear products. It was indicated that it is probable that the cohesion of the material will decrease and that the character of the wear process will change as a result of tension. Deformation under tension without heating of polymeric material (PE-HD), e.g., as a result of assembly, has been qualified as a threat to be taken into account when designing and analysing polymeric sliding elements.

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“…The polymer lip seals, which are strained as a result of shaft mounting, have received a great deal of attention because they are often used in mechanical engineering. Many studies and simulations have been developed and presented, thanks to which strain and stress in shaft-seated seals have been determined [11][12][13][14][15]. Their aim was to obtain the possibility of forecasting frictional resistance and durability of seals.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Kujawa

Kowalewski

Wieleba

2019

Preprint

View full text Add to dashboard Cite

Polymer materials are increasingly being used for sliding machine elements due to their numerous advantages. They are used even where they are deformed and in such a state they interact frictionally e.g. in machine hydraulics or lip seals. Few publications deal with the influence of deformation, which is the effect of e.g. assembly on tribological properties of polymeric material. This deformation can reach up to ε ≈ 20% and is achieved without increasing the temperature of the polymer material. The paper presents the results of investigations in which high-density polyethylene (PE-HD) was maintained in deformation by means of a special grip (holder). The wear of the sample was significantly higher than that of the undeformed sample. This effect persisted even after partial relaxation of the stress in the sample after 24 hours. Additional investigations were carried out to explain the obtained results. There were the microscopic observations of the surface after friction, measurements of microhardness and free surface energy. Changes in the value of surface free energy and a significant decrease in microhardness with deformation under tension were observed. Strained material had a different surface appearance after friction and a different size and form of wear products. It was indicated that it is probable that the cohesion of the material will decrease and that the character of the wear process will change as a result of tension. Tension without heating of polymeric material (PE-HD), e.g. as a result of assembly, has been qualified as a hazard to be taken into account when designing and analysing polymeric sliding elements.

show abstract

Computational analysis of PTFE shaft seals

Cited by 5 publications

References 13 publications

Multiphysics modelling of manufacturing processes: A review

Multiphysics modelling of manufacturing processes: A review

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

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