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  • Schipper, D. J.  (3)
  • 2020-2024  (3)
  • 1
    Online Resource
    Online Resource
    Analysis of the Effect of the Slip-Pocket in Single and Double Parallel Bearing Considering Cavitation: A Theoretical Approach
    MDPI AG ; 2020
    In:  Lubricants Vol. 9, No. 1 ( 2020-12-28), p. 3-
    Details
    In: Lubricants, MDPI AG, Vol. 9, No. 1 ( 2020-12-28), p. 3-
    Abstract: In this paper, based on an analytical approach, the effect of pockets and boundary slip on the hydrodynamic performance of parallel sliding surfaces considering cavitation is investigated. A modified Reynolds theory is developed for solving two kinds of bearings: a single and a double pocket bearing. The performance is compared with respect to the variation of the pocket depth, pocket length, slip, and no-slip situation. The results show that the maximum pressure and load support increases with the reduction in pocket length. The main finding is that the pocket depth reduces the cavitation area. However, in the case of a single pocket, the role of pocket depth is more significant in reducing the cavitation effect than that in the case of a double pocket bearing.
    Type of Medium: Online Resource
    ISSN: 2075-4442
    URL: Article
    DOI: 10.3390/lubricants9010003
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2704327-7
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Validity of Amontons’ law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers
    Springer Science and Business Media LLC ; 2020
    In:  Friction Vol. 8, No. 3 ( 2020-06), p. 613-625
    Details
    In: Friction, Springer Science and Business Media LLC, Vol. 8, No. 3 ( 2020-06), p. 613-625
    Abstract: Friction between two contacting surfaces is studied extensively. One of the known friction theories is Amontons’ law which states that the friction force is proportional to the normal force. However, Amontons’ law has been found to be invalid for elastomers. In the present study, the validity of Amontons’ law for short-cut aramid fiber reinforced elastomers is studied. Two types of fillers are used to reinforce the elastomers, namely highly dispersible silica and short-cut aramid fibers. Short-cut aramid fibers with two different surface treatments are used, namely non-reactive fibers with standard oily finish (SF-fibers) and fibers treated with an epoxy coating (EF-fibers). A pin-on-disc tribometer is used to investigate the frictional behavior of the composites in sliding contact with a granite counter surface. The results show that, after the run-in phase, Amontons’ law is valid for those composites that are reinforced by short-cut aramid fibers (without reinforcing filler, i.e., silica) if the contact pressure is below a threshold value. However, once the contact pressure exceeds this threshold value, Amontons’ law will be invalid. The threshold contact pressure of the composites containing EF-fibers is higher than of the composites containing SF-fibers. The composites that are reinforced by silica and short-cut aramid fibers do not follow Amontons’ law.
    Type of Medium: Online Resource
    ISSN: 2223-7690 , 2223-7704
    URL: Article
    DOI: 10.1007/s40544-019-0311-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2787589-1
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  • 3
    Online Resource
    Online Resource
    Evaluation of Pre-Sliding Behavior at a Rough Interface: Modeling and Experiment
    ASME International ; 2020
    In:  Journal of Applied Mechanics Vol. 87, No. 4 ( 2020-04-01)
    Details
    In: Journal of Applied Mechanics, ASME International, Vol. 87, No. 4 ( 2020-04-01)
    Abstract: One of the main issues in precision engineering is the lack of deep understanding of the pre-sliding behavior at the interface of mating surfaces of positioning mechanisms. In addition to the mechanical properties of the contacting bodies, their surface topography plays a key role in the pre-sliding regime and has a great impact on the frictional stiffness. This paper experimentally evaluates a boundary element method (BEM) model for the pre-sliding behavior at the interface of a smooth silicon wafer and a rough polymeric ball. The polymeric ball is either high-density polyethylene (HDPE) or polyoxymethylene (POM). The experiments are conducted at three different normal loads on five different spots on the wafer. The sliding stroke and coefficient of friction are extracted from experiments to be implemented as inputs to the numerical model. The roughness of the balls is also another input. The numerical and experimental friction hysteresis loops are compared. There is a small difference in the predicted pre-sliding distance from the experiments. The lateral stiffness, calculated at three different points on the pre-sliding regime of friction hysteresis loops, is compared with the Mindlin’s solution and experimental values for both contact interfaces and normal loads.
    Type of Medium: Online Resource
    ISSN: 0021-8936 , 1528-9036
    URL: Article
    DOI: 10.1115/1.4045900
    Language: English
    Publisher: ASME International
    Publication Date: 2020
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