The Experts below are selected from a list of 438 Experts worldwide ranked by ideXlab platform

Mci H Clark - One of the best experts on this subject based on the ideXlab platform.

  • Particle velocity and size effects in laboratory slurry erosion measurements or do you know what your Particles are doing
    Tribology International, 2002
    Co-Authors: Mci H Clark
    Abstract:

    Abstract The major factors which determine the Erodent Particle impact wear process are described. Thus, Particle impact velocity, impact angle and impact frequency are dictated by the slurry flow regime about the specimen. The influence of these factors on erosion rates (or on erosion–corrosion rates) can only be understood in terms of a quantitative model for slurry flow and Particle impact and an assumption on the nature of the rate-controlling factor governing material loss. For erosion in the absence of corrosion, this latter has been taken to be the rate of dissipation of Particle impact energy on the specimen surface. It is emphasised that material loss must be measured by changes in surface profile rather than mass loss, and that the best specimen form for this analysis is a cylinder. The effect of change of Particle size on erosion rates is discussed. It is suggested that the application of these experimental and analytical techniques should provide a tool for the quantitative analysis of wastage in conditions of erosion–corrosion.

  • a re examination of the Particle size effect in slurry erosion
    Wear, 2001
    Co-Authors: Mci H Clark, Ryan B Hartwich
    Abstract:

    Abstract The nature and significance of what has been called the ‘Particle size effect’ on the rate of slurry erosion and the problem of its experimental evaluation are discussed. Experiments involving the change of Erodent Particle size in typical laboratory test equipment, while revealing a decrease in erosion rate with decreasing Erodent Particle size, also produce significant changes in the slurry flow conditions and Particle motion which, unless evaluated quantitatively, will mask the nature of the Particle size effect. Some model for the rate of material removal must be assumed to allow comparison between the conditions examined. We assume this to be the rate of dissipation of Erodent Particle kinetic energy at impact. Wear results have been obtained using a slurry pot erosion tester (for which the flow conditions about, and impact conditions on, the 6 mm diameter cylindrical specimens have been modelled and experimentally confirmed), using 0.94 wt.% suspensions of SiC (varying in mean Particle size from 14 to 780 μm) in diesel oil for aluminium and Pyrex glass. For aluminium no damage threshold was observed and the experimental erosion rate varied as d p 2 over the whole Particle size range. A contribution to this of d p was found to be ascribable to fluid flow changes in the experimental apparatus and the remaining contribution of d p between 100 and 780 μm tentatively assigned to the decrease in surface energy of debris Particles with increasing Particle size. Below 100 μm there is a transition from wear by Particle impact to wear by wet abrasion by Particles moving across the surface. Quantitative analysis of erosion rates on the basis of Particle impact energies was not possible in this range. For Pyrex glass, erosion wear was measured only between 390 and 780 μm and was found to vary as d p 4 . This dependence was made up of d p for fluid flow changes, d p for debris Particle size and d p 2 for the influence of an energy threshold for damage of between 2 and 8 μJ for each Particle impact. After taking flow conditions and squeeze film retardation at impact into account, it is concluded that there is no fundamental change in the interaction between impacting Erodent Particles and the wearing surface with increasing Particle size between 100 and 780 μm.

Chandra Sekher Yerramalli - One of the best experts on this subject based on the ideXlab platform.

  • a multiple Particle impact model for prediction of erosion in carbon fiber reinforced composites
    Wear, 2018
    Co-Authors: Ajaz Ahmed Deliwala, Rinu M Peter, Chandra Sekher Yerramalli
    Abstract:

    Abstract Material loss and degradation due to erosion remains a major concern in engineering applications for composite materials. A finite element based model has been developed to predict the erosion behavior of unidirectional carbon fiber-epoxy (CFRP) composites subjected to solid Particle impacts. In this model, the CFRP plate is subjected to multiple Particle impacts at a velocity of 45 m/s, with steel balls as the Erodent Particles. The Influence of impact angle, Erodent Particle stream orientation (parallel and transverse to the fiber direction) and Erodent Particle size has been studied by varying the impact angle from 15⁰–90⁰ and Particle sizes considered are of radii 150 µm, 200 µm and 250 µm. The model captures the influence of the Erodent Particle to Particle impacts and the target surface properties by defining two new ratios, kinetic energy ratio, “ηk” and substrate surface property ratio, “ηs”. The cumulative eroded mass predictions are higher for transverse to fiber impact as compared to parallel to fiber impacts. It is also observed that as the Erodent size increases the total eroded mass loss increases at all impact angles. The eroded mass predictions obtained from the numerical model compare favorably with the eroded mass results obtained from experimental data reported in the literature.

  • A multiple Particle impact model for prediction of erosion in carbon-fiber reinforced composites
    'Wiley', 2018
    Co-Authors: Ajaz Ahmed Deliwala, Peter Mr, Chandra Sekher Yerramalli
    Abstract:

    Material loss and degradation due to erosion remains a major concern in engineering applications for composite materials. A finite element based model has been developed to predict the erosion behavior of unidirectional carbon fiber-epoxy (CFRP) composites subjected to solid Particle impacts. In this model, the CFRP plate is subjected to multiple Particle impacts at a velocity of 45 m/s, with steel balls as the Erodent Particles. The Influence of impact angle, Erodent Particle stream orientation (parallel and transverse to the fiber direction) and Erodent Particle size has been studied by varying the impact angle from 15 degrees-90 degrees and Particle sizes considered are of radii 150 mu m, 200 mu m and 250 mu m. The model captures the influence of the Erodent Particle to Particle impacts and the target surface properties by defining two new ratios, kinetic energy ratio, "eta(k)" and substrate surface property ratio, "eta(s)". The cumulative eroded mass predictions are higher for transverse to fiber impact as compared to parallel to fiber impacts. It is also observed that as the Erodent size increases the total eroded mass loss increases at all impact angles. The eroded mass predictions obtained from the numerical model compare favorably with the eroded mass results obtained from experimental data reported in the literature

Tamer Sinmazcelik - One of the best experts on this subject based on the ideXlab platform.

  • solid Particle erosive wear behavior of glass mat reinforced pps composites influence of Erodent Particle size pressure Particle impingement angle and velocity
    Advances in Polymer Technology, 2013
    Co-Authors: Egemen Avcu, Tamer Sinmazcelik, Sinan Fidan, Mustafa Ozgur Bora, Onur Coban, Isa Taskiran
    Abstract:

    This study investigates solid Particle erosive wear behavior of glass mat reinforced polyphenylene sulfide (PPS) matrix composites under various test parameters. PPS composite was manufactured by using the compression-molding process. Composite samples were eroded in a specially designed sandblasting system employing various parameters, and variation of the erosion rate was investigated. Samples were eroded at different erosion times, Particle impingement angles, and under various pressures by using three different sizes of alumina Particles. Impingement velocities of Erodent Particles were measured by using the double disk method. The results are also discussed regarding impingement velocity of the Erodent Particles. Glass mat reinforced PPS composites exhibited semiductile erosion behavior by showing a maximum erosion rate at 30° and 45° impingement angles. The erosion rate of the composite was increased with augmentation in erosion time, velocity, pressure, and Particle size. Maximum erosion was observed when the composite was eroded after 10 s at 45° impingement angle under 4 bar pressure by using 60 mesh size Erodent Particles. The morphology of eroded surfaces was examined by using a scanning electron microscope, and possible wear mechanisms were discussed. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E386–E398, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21286

Ajaz Ahmed Deliwala - One of the best experts on this subject based on the ideXlab platform.

  • a multiple Particle impact model for prediction of erosion in carbon fiber reinforced composites
    Wear, 2018
    Co-Authors: Ajaz Ahmed Deliwala, Rinu M Peter, Chandra Sekher Yerramalli
    Abstract:

    Abstract Material loss and degradation due to erosion remains a major concern in engineering applications for composite materials. A finite element based model has been developed to predict the erosion behavior of unidirectional carbon fiber-epoxy (CFRP) composites subjected to solid Particle impacts. In this model, the CFRP plate is subjected to multiple Particle impacts at a velocity of 45 m/s, with steel balls as the Erodent Particles. The Influence of impact angle, Erodent Particle stream orientation (parallel and transverse to the fiber direction) and Erodent Particle size has been studied by varying the impact angle from 15⁰–90⁰ and Particle sizes considered are of radii 150 µm, 200 µm and 250 µm. The model captures the influence of the Erodent Particle to Particle impacts and the target surface properties by defining two new ratios, kinetic energy ratio, “ηk” and substrate surface property ratio, “ηs”. The cumulative eroded mass predictions are higher for transverse to fiber impact as compared to parallel to fiber impacts. It is also observed that as the Erodent size increases the total eroded mass loss increases at all impact angles. The eroded mass predictions obtained from the numerical model compare favorably with the eroded mass results obtained from experimental data reported in the literature.

  • A multiple Particle impact model for prediction of erosion in carbon-fiber reinforced composites
    'Wiley', 2018
    Co-Authors: Ajaz Ahmed Deliwala, Peter Mr, Chandra Sekher Yerramalli
    Abstract:

    Material loss and degradation due to erosion remains a major concern in engineering applications for composite materials. A finite element based model has been developed to predict the erosion behavior of unidirectional carbon fiber-epoxy (CFRP) composites subjected to solid Particle impacts. In this model, the CFRP plate is subjected to multiple Particle impacts at a velocity of 45 m/s, with steel balls as the Erodent Particles. The Influence of impact angle, Erodent Particle stream orientation (parallel and transverse to the fiber direction) and Erodent Particle size has been studied by varying the impact angle from 15 degrees-90 degrees and Particle sizes considered are of radii 150 mu m, 200 mu m and 250 mu m. The model captures the influence of the Erodent Particle to Particle impacts and the target surface properties by defining two new ratios, kinetic energy ratio, "eta(k)" and substrate surface property ratio, "eta(s)". The cumulative eroded mass predictions are higher for transverse to fiber impact as compared to parallel to fiber impacts. It is also observed that as the Erodent size increases the total eroded mass loss increases at all impact angles. The eroded mass predictions obtained from the numerical model compare favorably with the eroded mass results obtained from experimental data reported in the literature

Egemen Avcu - One of the best experts on this subject based on the ideXlab platform.

  • Effect of micro blasting process parameters on 3D surface topography and surface properties of zirconia (Y‐TZP) ceramics
    'Wiley', 2021
    Co-Authors: Okan Yetik, Berzah Yavuzyegit, Yasemin Yıldıran Avcu, Hürol Koçoğlu, Gürel Pekkan, Serkan Sarıdağ, Mert Guney, Egemen Avcu
    Abstract:

    Abstract The present study aims to examine the effects of operational parameters on the surface topography and wear mechanisms of monolithic and conventional yttria‐stabilized zirconia (Y‐TZP) ceramics in the micro blasting process, performed under various acceleration pressures (1.5–3 bar), Particle impact angles (30°–90°), and Erodent Particle sizes (50–460 μm). Three‐dimensional (3D) surface topography, surface roughness, and surface morphology of micro‐blasted specimens were analyzed by using non‐contact optical profilometry and SEM‐EDS. The micro blasting characteristics of both Y‐TZP were similar that increased blasting pressure and Erodent Particle size increased surface roughness. Erosion rate increased with increasing blasting pressure, whereas it decreased with increasing Erodent Particle size. Particle size was the most effective parameter on changing surface topography, while the Particle impact angle had no distinct effect on the erosion rate, surface roughness, and surface topography of Y‐TZP ceramics. SEM‐EDS analyses showed that the primary wear mechanism during micro blasting was micro‐cutting with a substantial amount of embedded Particles on the material's surface

  • solid Particle erosive wear behavior of glass mat reinforced pps composites influence of Erodent Particle size pressure Particle impingement angle and velocity
    Advances in Polymer Technology, 2013
    Co-Authors: Egemen Avcu, Tamer Sinmazcelik, Sinan Fidan, Mustafa Ozgur Bora, Onur Coban, Isa Taskiran
    Abstract:

    This study investigates solid Particle erosive wear behavior of glass mat reinforced polyphenylene sulfide (PPS) matrix composites under various test parameters. PPS composite was manufactured by using the compression-molding process. Composite samples were eroded in a specially designed sandblasting system employing various parameters, and variation of the erosion rate was investigated. Samples were eroded at different erosion times, Particle impingement angles, and under various pressures by using three different sizes of alumina Particles. Impingement velocities of Erodent Particles were measured by using the double disk method. The results are also discussed regarding impingement velocity of the Erodent Particles. Glass mat reinforced PPS composites exhibited semiductile erosion behavior by showing a maximum erosion rate at 30° and 45° impingement angles. The erosion rate of the composite was increased with augmentation in erosion time, velocity, pressure, and Particle size. Maximum erosion was observed when the composite was eroded after 10 s at 45° impingement angle under 4 bar pressure by using 60 mesh size Erodent Particles. The morphology of eroded surfaces was examined by using a scanning electron microscope, and possible wear mechanisms were discussed. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E386–E398, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21286