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You searched for +publisher:"University of Twente" +contributor:("Jamari, Jamari"). Showing records 1 – 3 of 3 total matches.

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1. Ismail, Rifky. Running-in of Rolling-Sliding Contacts.

Degree: Faculty of Engineering Technology, 2013, University of Twente

Running-in of two fresh and unworn surfaces in contact is a transient phase where friction and wear vary considerably in time. During running-in the surface properties of the components are adjusted. If the initial surface roughness of the rubbing surfaces is correctly chosen, the running-in changes into the steady-state phase. At this stage, the rubbing surfaces are in general smoother and their wear rate is low and constant. On the other hand, an inappropriate choice of roughness may lead to a rapid deterioration of the rubbing surfaces. The micro-geometry of the surface is an important factor in determining the life of mechanical components. During the running-in phase, the highest asperities are “flattened”, thereby increasing the number of asperities in contact and, as a result, increasing the load-carrying capacity of the surface. Fundamental studies that attempt to consider the details of running-in phenomena are relatively rare. This research is conducted with the aim of exploring the running-in phase for the rolling, sliding and rolling-sliding contact. Finite element simulations are conducted to calculate the stress distributions for the three types of contact motions during the running-in phase. The evolution of the contact pressure for a certain rolling or sliding distance is studied to unravel the running-in phase. During running-in of rolling contacts, the change in the surface topography results in the transformation from a rough surface to a smoother surface: the flattening of the high asperities induces a reduction in surface roughness. This flattening of asperities is due to plastic deformation and causes a higher equivalent residual stress at the surface. The transition of the running-in phase to the steady-state phase of a rolling contact is governed by the transition of plastic to elastic deformation on roughness level. In sliding contacts, the proposed finite element (FE) model combined with the Archard wear equation successfully predicts the contact pressure evolution and change in the topography on a macroscopic point of view. The change in the topography in a sliding contact is mainly caused by wear. A new FE model, with respect to the artificial and real surface roughness, is discussed. It is found that the proposed model is a useful tool to study the running-in of a surface on roughness level. The changes on macroscopic and on microscopic level of the surface are also discussed in the running-in of rolling-sliding contacts considering two aspects: wear and plastic deformation. The geometrical change of the contacting surface due to wear is predicted using the present FEM model, combined with the Archard wear equation, and has been compared with results from the literature. Calculations are performed to predict the wear of an artificial rough hemisphere in rolling-sliding contact with a smooth cylinder. The model also predicts the change of real rough surfaces which were in good agreement with the experimental results. The change of a rough surface, represented by an arithmetic average… Advisors/Committee Members: Schipper, Dirk J., Jamari, Jamari.

Subjects/Keywords: IR-88844; METIS-300311

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APA (6th Edition):

Ismail, R. (2013). Running-in of Rolling-Sliding Contacts. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html ; urn:nbn:nl:ui:28-88844 ; 4a009bcb-0de1-4e87-969d-54e7cedddb1e ; 84919476338 ; 10.3990/1.9789036518871 ; urn:isbn:978-90-365-1887-1 ; urn:nbn:nl:ui:28-88844 ; https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html

Chicago Manual of Style (16th Edition):

Ismail, Rifky. “Running-in of Rolling-Sliding Contacts.” 2013. Doctoral Dissertation, University of Twente. Accessed October 23, 2020. https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html ; urn:nbn:nl:ui:28-88844 ; 4a009bcb-0de1-4e87-969d-54e7cedddb1e ; 84919476338 ; 10.3990/1.9789036518871 ; urn:isbn:978-90-365-1887-1 ; urn:nbn:nl:ui:28-88844 ; https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html.

MLA Handbook (7th Edition):

Ismail, Rifky. “Running-in of Rolling-Sliding Contacts.” 2013. Web. 23 Oct 2020.

Vancouver:

Ismail R. Running-in of Rolling-Sliding Contacts. [Internet] [Doctoral dissertation]. University of Twente; 2013. [cited 2020 Oct 23]. Available from: https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html ; urn:nbn:nl:ui:28-88844 ; 4a009bcb-0de1-4e87-969d-54e7cedddb1e ; 84919476338 ; 10.3990/1.9789036518871 ; urn:isbn:978-90-365-1887-1 ; urn:nbn:nl:ui:28-88844 ; https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html.

Council of Science Editors:

Ismail R. Running-in of Rolling-Sliding Contacts. [Doctoral Dissertation]. University of Twente; 2013. Available from: https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html ; urn:nbn:nl:ui:28-88844 ; 4a009bcb-0de1-4e87-969d-54e7cedddb1e ; 84919476338 ; 10.3990/1.9789036518871 ; urn:isbn:978-90-365-1887-1 ; urn:nbn:nl:ui:28-88844 ; https://research.utwente.nl/en/publications/runningin-of-rollingsliding-contacts(4a009bcb-0de1-4e87-969d-54e7cedddb1e).html

2. Khafidh, Muhammad. Friction, Wear and Noise of Short-cut Aramid Fibre Reinforced Elastomers in Sliding Contacts.

Degree: 2019, University of Twente

Many types of elastomer based products are found in daily life, such as tyres, v-belts and wiper blades. In applications, several reinforcing materials are usually added into the elastomers to increase their mechanical and tribological properties. The examples of these reinforcing materials are carbon black, silica and fibres. Short-cut aramid fibre is a relatively new high-performance material that can be used to reinforce elastomers. However, the interaction between fibre and elastomer matrix is still a problem to be solved. Moreover, friction, wear and friction-induced noise of short-cut aramid fibre reinforced elastomers is not well known. Understanding friction, wear and friction-induced noise will lead to a better design, so that the lifetime of the elastomers can be prolonged. This research is conducted within the project FINE-FIT (Fibres IN Elastomer For Improved Tribology), which is a collaboration between the Surface Technology and Tribology (STT) group and the Elastomer Technology and Engineering (ETE) group at the University of Twente. An optimized formulation of composites to improve the interaction between the fibres and elastomer matrix was investigated by the ETE group, while the investigation of the tribological behaviour of short-cut aramid fibre reinforced elastomers was conducted by the STT group. The short-cut aramid fibre reinforced elastomers used in this thesis are based on the optimized formulation of the ETE group. Tribological phenomena of elastomers during sliding friction were studied, such as the contact area, the formation of a modified surface layer and the occurrence of a wavy wear track. The size and shape of the contact area of elastomers during sliding change in comparison with the static condition. The contact area depends on the sliding velocity and the mechanical properties of the elastomers, such as storage modulus. During sliding contact, the composition and the mechanical properties of the elastomer surface may change. These surface alterations will lead to a change of the tribological behaviour of elastomers. The existence of a modified surface layer is influenced by the competition between formation and wear, which depends on the contact pressure, sliding velocity and sliding distance. Another phenomenon during sliding friction is a macro surface irregularity at the wear track, called a wavy wear track. In application, the wavy wear track needs to be avoided because it will reduce the performance of the sliding system and generate vibrations and noise. The occurrence of the wavy wear track depends on the mechanical properties of the elastomer, the operating conditions (such as sliding velocity and force), the inertia mass of the counter surface frame and the circumferential length of the wear track. Friction, wear and friction-induced noise of short-cut aramid fibre reinforced elastomers were investigated by using two types of short-cut aramid fibres, namely non-coated fibre (NF) and epoxy-coated fibre (EF). The wear mechanism during sliding contact greatly influences the… Advisors/Committee Members: Schipper, Dirk J., Masen, Marc Arthur, Jamari, Jamari.

Subjects/Keywords: Elastomer; Friction; Wear; Noise; Short-cut aramid fibre

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APA (6th Edition):

Khafidh, M. (2019). Friction, Wear and Noise of Short-cut Aramid Fibre Reinforced Elastomers in Sliding Contacts. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; 8a114118-d11b-44ef-af76-d1f090484960 ; 10.3990/1.9789036546829 ; urn:isbn:978-90-365-4682-9 ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html

Chicago Manual of Style (16th Edition):

Khafidh, Muhammad. “Friction, Wear and Noise of Short-cut Aramid Fibre Reinforced Elastomers in Sliding Contacts.” 2019. Doctoral Dissertation, University of Twente. Accessed October 23, 2020. https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; 8a114118-d11b-44ef-af76-d1f090484960 ; 10.3990/1.9789036546829 ; urn:isbn:978-90-365-4682-9 ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html.

MLA Handbook (7th Edition):

Khafidh, Muhammad. “Friction, Wear and Noise of Short-cut Aramid Fibre Reinforced Elastomers in Sliding Contacts.” 2019. Web. 23 Oct 2020.

Vancouver:

Khafidh M. Friction, Wear and Noise of Short-cut Aramid Fibre Reinforced Elastomers in Sliding Contacts. [Internet] [Doctoral dissertation]. University of Twente; 2019. [cited 2020 Oct 23]. Available from: https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; 8a114118-d11b-44ef-af76-d1f090484960 ; 10.3990/1.9789036546829 ; urn:isbn:978-90-365-4682-9 ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html.

Council of Science Editors:

Khafidh M. Friction, Wear and Noise of Short-cut Aramid Fibre Reinforced Elastomers in Sliding Contacts. [Doctoral Dissertation]. University of Twente; 2019. Available from: https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; 8a114118-d11b-44ef-af76-d1f090484960 ; 10.3990/1.9789036546829 ; urn:isbn:978-90-365-4682-9 ; urn:nbn:nl:ui:28-8a114118-d11b-44ef-af76-d1f090484960 ; https://research.utwente.nl/en/publications/friction-wear-and-noise-of-shortcut-aramid-fibre-reinforced-elastomers-in-sliding-contacts(8a114118-d11b-44ef-af76-d1f090484960).html

3. Tauviqirrahman, Mohammad. Lubricated MEMS: effect of boundary slippage and texturing.

Degree: Faculty of Engineering Technology, 2013, University of Twente

Many types of micro-electro-mechanical-system (MEMS) based products are currently employed in a variety of applications. Recently, there has been an increase in the demand for higher reliability of MEMS which incorporate moving parts for each intended application. This is because the reliability of MEMS containing moving parts is poor and has a limited lifetime. Applying a lubricant to these systems to avoid wear hampers the movement due to the adhesive/surface forces, leading to stiction. By modifying the contacting surfaces, one is able to enhance the behavior of surfaces in a controlled way and thus alter the flow pattern in the liquid lubricating film for an enhanced performance. In this thesis, the concept of complex slip surface (CSS) as an artificial (deterministic) boundary slip surface is introduced. The thesis examines the exploitation of the artificial boundary slip to improve the performance of liquid lubricated-MEMS, with the emphasis on increasing the load support and reducing the coefficient of friction. Therefore, it is of great importance to get a clear view of the concept of the artificial boundary slip with respect to the performance of lubricated-MEMS. Advisors/Committee Members: Schipper, Dirk J., Jamari, Jamari.

Subjects/Keywords: IR-88843; METIS-300296

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tauviqirrahman, M. (2013). Lubricated MEMS: effect of boundary slippage and texturing. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html ; urn:nbn:nl:ui:28-88843 ; 7e5280d6-8d33-48d6-9536-a7a2152b28f6 ; 10.3990/1.9789036519168 ; urn:isbn:978-90-365-1916-8 ; urn:nbn:nl:ui:28-88843 ; https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html

Chicago Manual of Style (16th Edition):

Tauviqirrahman, Mohammad. “Lubricated MEMS: effect of boundary slippage and texturing.” 2013. Doctoral Dissertation, University of Twente. Accessed October 23, 2020. https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html ; urn:nbn:nl:ui:28-88843 ; 7e5280d6-8d33-48d6-9536-a7a2152b28f6 ; 10.3990/1.9789036519168 ; urn:isbn:978-90-365-1916-8 ; urn:nbn:nl:ui:28-88843 ; https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html.

MLA Handbook (7th Edition):

Tauviqirrahman, Mohammad. “Lubricated MEMS: effect of boundary slippage and texturing.” 2013. Web. 23 Oct 2020.

Vancouver:

Tauviqirrahman M. Lubricated MEMS: effect of boundary slippage and texturing. [Internet] [Doctoral dissertation]. University of Twente; 2013. [cited 2020 Oct 23]. Available from: https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html ; urn:nbn:nl:ui:28-88843 ; 7e5280d6-8d33-48d6-9536-a7a2152b28f6 ; 10.3990/1.9789036519168 ; urn:isbn:978-90-365-1916-8 ; urn:nbn:nl:ui:28-88843 ; https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html.

Council of Science Editors:

Tauviqirrahman M. Lubricated MEMS: effect of boundary slippage and texturing. [Doctoral Dissertation]. University of Twente; 2013. Available from: https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html ; urn:nbn:nl:ui:28-88843 ; 7e5280d6-8d33-48d6-9536-a7a2152b28f6 ; 10.3990/1.9789036519168 ; urn:isbn:978-90-365-1916-8 ; urn:nbn:nl:ui:28-88843 ; https://research.utwente.nl/en/publications/lubricated-mems(7e5280d6-8d33-48d6-9536-a7a2152b28f6).html

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