The Experts below are selected from a list of 4182 Experts worldwide ranked by ideXlab platform

N S M Eltayeb - One of the best experts on this subject based on the ideXlab platform.

  • Wear characteristics of thermoset composite under high stress three body Abrasive
    Tribology International, 2010
    Co-Authors: B F Yousif, N S M Eltayeb
    Abstract:

    Three-Body Abrasive Wear of chopped strand mat glass fibres reinforced polyester (CGRP) was studied for three principal orientations of the fibres, i.e. parallel orientation (P-O), anti-parallel orientation (AP-O) and normal orientation (N-O). The tests were carried out under high stress conditions. A correlation between the specific Wear rate and mechanical properties was established. As a result, CGRP composite exhibited better Wear characteristic in P-O than in AP-O and N-O. Different Wear mechanisms were observed on the worn surfaces of the materials, including pitting, micro- and/or macro-cracks, as well as breakage and debonding of the fibres.

  • high stress three body Abrasive Wear of treated and untreated oil palm fibre reinforced polyester composites
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2008
    Co-Authors: B F Yousif, N S M Eltayeb
    Abstract:

    The aim of this study is to investigate the effect of treated and untreated oil palm fibres on high-stress Three-Body Abrasive Wear characteristics of polyester composites. Experimental tests were conducted at different applied loads (5-20 N) and two different rotational speeds (50 and 100 r/min) for 0.18km sliding distance using a dry sand/steel wheel apparatus. The flow of the sand particles (560-900 μm) was 4.5 g/s. Morphologies of the worn surface of the composites were studied using a scanning electron microscope (SEM). Pull-out test was carried out to evaluate the interfacial adhesion characteristics of treated and untreated fibres. The results revealed that composites based on treated oil palm fibres exhibited better Wear performance compared with untreated ones, i.e. the interfacial adhesion of treated fibres to the polyester was better than untreated fibres. Moreover, treated oil palm fibres were found to reduce the porosity of the composite, which in turn stabilized the surface tribo-characteristics. Based on the SEM analysis, the Wear mechanisms were predominated by pitting, grooving, microcracking, microcutting, and fracture in the polyester region.

  • high stress three body Abrasive Wear of treated and untreated oil palm fibre reinforced polyester composites
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2008
    Co-Authors: B F Yousif, N S M Eltayeb
    Abstract:

    The aim of this study is to investigate the effect of treated and untreated oil palm fibres on high-stress Three-Body Abrasive Wear characteristics of polyester composites. Experimental tests were conducted at different applied loads (5-20 N) and two different rotational speeds (50 and 100 r/min) for 0.18km sliding distance using a dry sand/steel wheel apparatus. The flow of the sand particles (560-900 μm) was 4.5 g/s. Morphologies of the worn surface of the composites were studied using a scanning electron microscope (SEM). Pull-out test was carried out to evaluate the interfacial adhesion characteristics of treated and untreated fibres. The results revealed that composites based on treated oil palm fibres exhibited better Wear performance compared with untreated ones, i.e. the interfacial adhesion of treated fibres to the polyester was better than untreated fibres. Moreover, treated oil palm fibres were found to reduce the porosity of the composite, which in turn stabilized the surface tribo-characteristics. Based on the SEM analysis, the Wear mechanisms were predominated by pitting, grooving, microcracking, microcutting, and fracture in the polyester region.

Kevin P. Plucknett - One of the best experts on this subject based on the ideXlab platform.

  • microstructural damage following reciprocating Wear of tic stainless steel cermets
    Tribology International, 2017
    Co-Authors: Chukwuma C Onuoha, Zoheir Farhat, Georges J. Kipouros, Kevin P. Plucknett
    Abstract:

    Abstract High density TiC-based cermets were fabricated using a simple melt-infiltration/sintering method, with three different grades of stainless steel binder. Reciprocating Wear tests were conducted using a ball-on-flat geometry, with the test material sliding against a WC-Co counter face. The morphology of the worn surface and Wear debris were investigated using SEM and EDS chemical analysis. FIB microscopy was applied to study sub-surface damage within the Wear tracks, to aid explanation of the operative Wear mechanism(s). The Wear behaviour is moderately complex, transitioning from two- to Three-Body Abrasive Wear, with both steel binder extrusion and TiC fragmentation observed to contribute towards third-body formation. A further transition to adhesive Wear is also observed, with tribolayer generation on both tribo pair surfaces.

  • the effects of tic grain size and steel binder content on the reciprocating Wear behaviour of tic 316l stainless steel cermets
    Wear, 2016
    Co-Authors: Chukwuma C Onuoha, Zoheir Farhat, Georges J. Kipouros, Kevin P. Plucknett
    Abstract:

    Abstract TiC-based cermets are heavily utilised in applications demanding good resistance to both Wear and corrosion. In the current work, TiC-stainless steel (grade 316L) cermets have been developed, with the TiC grain size varied through heat-treatment, for steel binder contents between 10 and 30 vol%. Microstructural analysis showed mean TiC grain sizes of ~4 and 10 μm, respectively, for fine- and coarse-grained cermets, with the grain size nominally consistent as a function of binder content. Sliding Wear resistance was assessed in a reciprocating motion, using a WC–Co counter face sphere paired against the TiC cermets. Overall, the fine-grained cermets exhibit better Wear resistance and hardness. The specific Wear rate was seen to increase with applied load and/or binder content, for both fine- and coarse-grained materials. SEM and FIB microscopy were used to assess the microstructural changes occurring during Wear. A two- to Three-Body Abrasive Wear transition was apparent, together with the formation of a surface tribolayer, which highlights a further evolution to an adhesive Wear mechanism. The tribolayer showed incorporation of a high concentration of O, which increased with the applied load, together with a predominance of the binder constituents.

  • the reciprocating Wear behaviour of tic 304l stainless steel composites prepared by melt infiltration
    Wear, 2013
    Co-Authors: Chukwuma C Onuoha, Zoheir Farhat, Georges J. Kipouros, Kevin P. Plucknett
    Abstract:

    Abstract TiC-based ceramic–metal composites, or cermets, are widely used in applications requiring Wear and corrosion resistance. In the present work, a family of novel TiC–stainless steel (grade 304L) cermets has been developed using vacuum melt infiltration (1500 °C/1 h), with steel binder contents varied from 5 to 30 vol%. Microstructural analysis showed a homogenous distribution of TiC within the steel binder, with mean TiC grain sizes of ∼6 μm. Increasing the steel content resulted in an increase in the indentation fracture resistance and a decrease in the hardness. The reciprocating Wear resistance of the cermets was assessed using a ball-on-flat geometry, using a WC–Co sphere dry sliding on the polished cermet surface. It was shown that there is an increase in the specific Wear rate with both increasing load and binder content. Similarly, a higher coefficient of friction was observed with higher steel binder contents. The morphology of the worn surface was investigated using scanning electron microscopy, and associated energy dispersive X-ray spectroscopy, to more fully understand the operative Wear mechanisms. Evidence of a transition from two- to Three-Body Abrasive Wear was observed, together with the formation of a tribolayer, indicating that adhesive Wear was also occurring.

B F Yousif - One of the best experts on this subject based on the ideXlab platform.

  • Wear characteristics of thermoset composite under high stress three body Abrasive
    Tribology International, 2010
    Co-Authors: B F Yousif, N S M Eltayeb
    Abstract:

    Three-Body Abrasive Wear of chopped strand mat glass fibres reinforced polyester (CGRP) was studied for three principal orientations of the fibres, i.e. parallel orientation (P-O), anti-parallel orientation (AP-O) and normal orientation (N-O). The tests were carried out under high stress conditions. A correlation between the specific Wear rate and mechanical properties was established. As a result, CGRP composite exhibited better Wear characteristic in P-O than in AP-O and N-O. Different Wear mechanisms were observed on the worn surfaces of the materials, including pitting, micro- and/or macro-cracks, as well as breakage and debonding of the fibres.

  • high stress three body Abrasive Wear of treated and untreated oil palm fibre reinforced polyester composites
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2008
    Co-Authors: B F Yousif, N S M Eltayeb
    Abstract:

    The aim of this study is to investigate the effect of treated and untreated oil palm fibres on high-stress Three-Body Abrasive Wear characteristics of polyester composites. Experimental tests were conducted at different applied loads (5-20 N) and two different rotational speeds (50 and 100 r/min) for 0.18km sliding distance using a dry sand/steel wheel apparatus. The flow of the sand particles (560-900 μm) was 4.5 g/s. Morphologies of the worn surface of the composites were studied using a scanning electron microscope (SEM). Pull-out test was carried out to evaluate the interfacial adhesion characteristics of treated and untreated fibres. The results revealed that composites based on treated oil palm fibres exhibited better Wear performance compared with untreated ones, i.e. the interfacial adhesion of treated fibres to the polyester was better than untreated fibres. Moreover, treated oil palm fibres were found to reduce the porosity of the composite, which in turn stabilized the surface tribo-characteristics. Based on the SEM analysis, the Wear mechanisms were predominated by pitting, grooving, microcracking, microcutting, and fracture in the polyester region.

  • high stress three body Abrasive Wear of treated and untreated oil palm fibre reinforced polyester composites
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2008
    Co-Authors: B F Yousif, N S M Eltayeb
    Abstract:

    The aim of this study is to investigate the effect of treated and untreated oil palm fibres on high-stress Three-Body Abrasive Wear characteristics of polyester composites. Experimental tests were conducted at different applied loads (5-20 N) and two different rotational speeds (50 and 100 r/min) for 0.18km sliding distance using a dry sand/steel wheel apparatus. The flow of the sand particles (560-900 μm) was 4.5 g/s. Morphologies of the worn surface of the composites were studied using a scanning electron microscope (SEM). Pull-out test was carried out to evaluate the interfacial adhesion characteristics of treated and untreated fibres. The results revealed that composites based on treated oil palm fibres exhibited better Wear performance compared with untreated ones, i.e. the interfacial adhesion of treated fibres to the polyester was better than untreated fibres. Moreover, treated oil palm fibres were found to reduce the porosity of the composite, which in turn stabilized the surface tribo-characteristics. Based on the SEM analysis, the Wear mechanisms were predominated by pitting, grooving, microcracking, microcutting, and fracture in the polyester region.

Chukwuma C Onuoha - One of the best experts on this subject based on the ideXlab platform.

  • microstructural damage following reciprocating Wear of tic stainless steel cermets
    Tribology International, 2017
    Co-Authors: Chukwuma C Onuoha, Zoheir Farhat, Georges J. Kipouros, Kevin P. Plucknett
    Abstract:

    Abstract High density TiC-based cermets were fabricated using a simple melt-infiltration/sintering method, with three different grades of stainless steel binder. Reciprocating Wear tests were conducted using a ball-on-flat geometry, with the test material sliding against a WC-Co counter face. The morphology of the worn surface and Wear debris were investigated using SEM and EDS chemical analysis. FIB microscopy was applied to study sub-surface damage within the Wear tracks, to aid explanation of the operative Wear mechanism(s). The Wear behaviour is moderately complex, transitioning from two- to Three-Body Abrasive Wear, with both steel binder extrusion and TiC fragmentation observed to contribute towards third-body formation. A further transition to adhesive Wear is also observed, with tribolayer generation on both tribo pair surfaces.

  • the effects of tic grain size and steel binder content on the reciprocating Wear behaviour of tic 316l stainless steel cermets
    Wear, 2016
    Co-Authors: Chukwuma C Onuoha, Zoheir Farhat, Georges J. Kipouros, Kevin P. Plucknett
    Abstract:

    Abstract TiC-based cermets are heavily utilised in applications demanding good resistance to both Wear and corrosion. In the current work, TiC-stainless steel (grade 316L) cermets have been developed, with the TiC grain size varied through heat-treatment, for steel binder contents between 10 and 30 vol%. Microstructural analysis showed mean TiC grain sizes of ~4 and 10 μm, respectively, for fine- and coarse-grained cermets, with the grain size nominally consistent as a function of binder content. Sliding Wear resistance was assessed in a reciprocating motion, using a WC–Co counter face sphere paired against the TiC cermets. Overall, the fine-grained cermets exhibit better Wear resistance and hardness. The specific Wear rate was seen to increase with applied load and/or binder content, for both fine- and coarse-grained materials. SEM and FIB microscopy were used to assess the microstructural changes occurring during Wear. A two- to Three-Body Abrasive Wear transition was apparent, together with the formation of a surface tribolayer, which highlights a further evolution to an adhesive Wear mechanism. The tribolayer showed incorporation of a high concentration of O, which increased with the applied load, together with a predominance of the binder constituents.

  • the reciprocating Wear behaviour of tic 304l stainless steel composites prepared by melt infiltration
    Wear, 2013
    Co-Authors: Chukwuma C Onuoha, Zoheir Farhat, Georges J. Kipouros, Kevin P. Plucknett
    Abstract:

    Abstract TiC-based ceramic–metal composites, or cermets, are widely used in applications requiring Wear and corrosion resistance. In the present work, a family of novel TiC–stainless steel (grade 304L) cermets has been developed using vacuum melt infiltration (1500 °C/1 h), with steel binder contents varied from 5 to 30 vol%. Microstructural analysis showed a homogenous distribution of TiC within the steel binder, with mean TiC grain sizes of ∼6 μm. Increasing the steel content resulted in an increase in the indentation fracture resistance and a decrease in the hardness. The reciprocating Wear resistance of the cermets was assessed using a ball-on-flat geometry, using a WC–Co sphere dry sliding on the polished cermet surface. It was shown that there is an increase in the specific Wear rate with both increasing load and binder content. Similarly, a higher coefficient of friction was observed with higher steel binder contents. The morphology of the worn surface was investigated using scanning electron microscopy, and associated energy dispersive X-ray spectroscopy, to more fully understand the operative Wear mechanisms. Evidence of a transition from two- to Three-Body Abrasive Wear was observed, together with the formation of a tribolayer, indicating that adhesive Wear was also occurring.

B Suresha - One of the best experts on this subject based on the ideXlab platform.

  • mechanical and Abrasive Wear behavior of carbon fabric reinforced epoxy composite with and without fly ash cenospheres
    Journal of Composite Materials, 2013
    Co-Authors: P Arivalagan, B Suresha, G Chandramohan, V Krishnaraj, N Palaniappan
    Abstract:

    Carbon fabric reinforced epoxy and carbon fabric reinforced epoxy containing different weight fraction of silane-treated fly ash cenospheres filled composites were cast, sectioned, and subjected to Three-Body Abrasive Wear tests for evaluating the Abrasive Wear behavior. Mechanical characterization was done and a comparison was made between the different samples. Abrasive Wear tests were performed on a rubber wheel abrasion tester under different loads, abrading distances using quartz and silica sand as Abrasives. The results showed that both unfilled carbon fabric reinforced epoxy and fly ash cenospheres filled carbon fabric reinforced epoxy composites exhibit differing magnitudes of Wear volume loss, it being highest for unfilled carbon fabric reinforced epoxy composite. The data trends point to the fact that the Wear volume and specific Wear rate decreases with increasing fly ash cenospheres loading in carbon fabric reinforced epoxy composites. It was found that silane-treated fly ash cenospheres could...

  • effect of particulate fillers on mechanical and Abrasive Wear behaviour of polyamide 66 polypropylene nanocomposites
    Materials & Design, 2009
    Co-Authors: B Ravi N Kumar, B Suresha, M Venkataramareddy
    Abstract:

    Abstract This article presents the mechanical and Three-Body Abrasive Wear behaviour of Polyamide 66/Polypropylene (PA66/PP) blend, nanoclay filled PA66/PP and short carbon fiber (diameter 6–7 μm and length 3–4 mm) reinforced PA66/PP nanocomposites. All particulate-filled PA66/PP composites were prepared by using twin screw extrusion followed by injection molding. Maleic anhydride polypropylene (MAgPP) was used as the compatibilizer. The mechanical properties of particulate-filled PA66/PP composites were studied, and the Three-Body Abrasive Wear behaviour was assessed by rubber wheel abrasion test under different loads/abrading distances. The results indicate that addition of nanoclay/short carbon fiber in PA66/PP have significant influence on Wear under varied abrading distance/loads. Further, it was found that nanoclay filled PA66/PP composites exhibited lower Wear rate compared to short carbon fiber filled PA66/PP composites. In addition, the worn surface morphology of the samples was also discussed.

  • mechanical and Abrasive Wear behavior of coleus spent filled unsaturated polyester polymethyl methacrylate semi interpenetrating polymer network composites
    Journal of Composite Materials, 2009
    Co-Authors: Murtuza Ali Syed, B Suresha, Akheel Ahmed Syed
    Abstract:

    Mechanical properties and Three-Body Abrasive Wear behavior of 5 and 10% w/w bio-based coleus spent (CS) filled and unfilled semi interpenetrating polymer network composites of unsaturated polyester/polymethyl methacrylate (80/20) have been studied. The tensile strength and elongation at break has been evaluated using 4302 Hounsfield Universal testing machine. The effect of abrading distances viz., 150, 300, 450, and 600 m and different loads of 22 and 32 N at 200 rpm on the Abrasive Wear behavior have been studied using dry sand/rubber wheel Abrasive test rig. The CS filler lowered the mechanical properties and improved abrasion resistance of USP/PMMA SIPN. The tensile strength of the composites lies in the range of 25.0-33.1 MPa. The Wear volume loss and specific Wear rate as a function of abrading distance and load were determined. The Wear volume loss increases with increased abrading distance/load for all composites tested. However, the specific Wear rate decreased with an increase in abrading distan...

  • investigations on three body Abrasive Wear behaviour of silicon carbide and graphite filled glass vinyl ester composites
    대한기계학회 춘추학술대회, 2007
    Co-Authors: B Suresha, G Chandramohan
    Abstract:

    The effect of silicon carbide (SiC) and graphite fillers incorporation on the Abrasive Wear behaviour of glass-vinyl ester (G-V) composites have been investigated. The Three-Body Abrasive Wear behaviour was assessed by rubber wheel abrasion tests (RWAT). The worn surfaces were examined using scanning electron microscopy (SEM). The addition of SiC and graphite fillers in G-V composite improves the abrasion resistance under different loads/abrading distances. The SEM studies indicate the reasons for failure of composites and influencing parameters.

  • three body Abrasive Wear behaviour of carbon and glass fiber reinforced epoxy composites
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: B Suresha, G Chandramohan, P Samapthkumaran, S Seetharamu
    Abstract:

    Abstract Three-Body Abrasive Wear behaviour of carbon–epoxy (C–E) and glass–epoxy (G–E) composites has been investigated. The effect of abrading distance, viz., 270, 540, 810 and 1080 m and different loads of 22 and 32 N at 200 rpm have been studied. The Wear volume loss and specific Wear rate as a function of load and abrading distance were determined. The Wear volume loss increases with increasing load/abrading distance. However, the specific Wear rate decreases with increase in abrading distance and increases with the load. However, C–E composite showed better abrasion Wear resistance compared to G–E composite. The worn surface features have been examined using scanning electron microscope (SEM). SEM micrographs of abraded composite specimens revealed the high percentage of broken glass fiber compared to carbon fiber and also better interfacial adhesion between epoxy and carbon fiber.