The Experts below are selected from a list of 16419 Experts worldwide ranked by ideXlab platform

Xiao Ming Tao - One of the best experts on this subject based on the ideXlab platform.

  • Evaluation of grid-domed textile composite as shock-absorbing liner of bicycle helmets
    Textile Research Journal, 2005
    Co-Authors: Y. W. Wong, Xiao Ming Tao
    Abstract:

    This paper is concerned with a study of the deformation mechanism of a flat-topped, grid-domed textile composite possessing high specific Energy Absorption Capacity. The composite was fabricated by curing thermoset resin-impregnated nylon knitted fabric as a grid-domed cellular structure. During the forming process the fabric stretching may affect the cell wall thickness which is a critical factor on the deformation mode and the global Energy Absorption Capacity. The deformation mechanism of a unit cell was studied under quasi-static axial compression and a modified mechanics model is proposed to describe the large plastic deformation mechanism of the flat-topped, conical cell under axial compression. The potential applications of this textile composite include use as a shock-absorbing liner of bicycle helmets, an Energy-absorbing vehicle door or other lightweight devices in which high Energy Absorption Capacity is of great importance.

  • comparison of different thermoplastic cellular textile composites on their Energy Absorption Capacity
    Composites Science and Technology, 2004
    Co-Authors: S.w. Lam, Xiao Ming Tao
    Abstract:

    This paper examines the Energy-Absorption behaviour and mechanism of various thermoplastic cellular textile composites with flat-topped grid-domed cellular structure under quasi-static compression and impact conditions. The fabrication process of compression molding the cellular textile composites made of UHMWPE/LDPE knitted, PET/PP knitted, and PET/PP non-woven systems, and injection molding the pure LDPE and pure PP cellular structure are described. The effects of impact Energy, fibre type, fibre volume fractions and fibre architecture on the Energy Absorption Capacity of the cellular composites, are discussed. The cell recovery after impact is also presented. The equivalent cell wall thickness is shown to be a pre-dominant factor governing the Energy Absorption Capacity of the cellular structure. With a constant thickness, increase in fibre volume fraction would lead to an increase in composite toughness as well as the Energy Absorption Capacity. Different deformation modes for both of the knitted and non-woven cellular composites, which are mainly due to their fibre architectures and cell wall thickness, are observed.

  • Non-woven fabric reinforced cellular textile composites with improved Energy Absorption Capacity
    Composites Technologies For 2020, 2004
    Co-Authors: S.w. Laml, Xiao Ming Tao, T.x. Yu
    Abstract:

    Flat-topped grid-dome cellular composites made of non-woven PET fabric reinforcement with polypropylene (PP) matrix were subjected to quasi-static axial compression and impact conditions. The mechanism of deformation and the Energy Absorption characteristics of the cells were studied. Based on the observations of the cell deformation mode, analytical expressions were formulated to find the mean peak value and thus the Energy Absorption Capacity of the cellular structure. The results obtained are in good agreement with the experimental results.

  • Comparison of different thermoplastic cellular textile composites on their Energy Absorption Capacity
    Composites Science and Technology, 2004
    Co-Authors: S.w. Lam, Xiao Ming Tao
    Abstract:

    This paper examines the Energy-Absorption behaviour and mechanism of various thermoplastic cellular textile composites with flat-topped grid-domed cellular structure under quasi-static compression and impact conditions. The fabrication process of compression molding the cellular textile composites made of UHMWPE/LDPE knitted, PET/PP knitted, and PET/PP non-woven systems, and injection molding the pure LDPE and pure PP cellular structure are described. The effects of impact Energy, fibre type, fibre volume fractions and fibre architecture on the Energy Absorption Capacity of the cellular composites, are discussed. The cell recovery after impact is also presented. The equivalent cell wall thickness is shown to be a pre-dominant factor governing the Energy Absorption Capacity of the cellular structure. With a constant thickness, increase in fibre volume fraction would lead to an increase in composite toughness as well as the Energy Absorption Capacity. Different deformation modes for both of the knitted and non-woven cellular composites, which are mainly due to their fibre architectures and cell wall thickness, are observed.Institute of Textiles and Clothin

  • POLYMERIC CELLULAR TEXTILE COMPOSITES FOR Energy Absorption
    Research Journal of Textile and Apparel, 2002
    Co-Authors: S.w. Lam, Xiao Ming Tao
    Abstract:

    This review paper is concerned with polymeric cellular textile composites with high specific Energy Absorption Capacity. These cellular textile composites, particularly grid domed structure, have been characterized and the deformation mechanisms are described. The Energy Absorption Capacity of the cellular structures may be varied by the geometrical parameters, cell density and the panel arrangement. Various fabrication processes of polymeric cellular textile composties are described, covering selection of reinforcing fibre and thermoset resin/ thermoplastic matrix material systems, methods of preform preparation by textile processing, and the manufacturing techniques of composite consolidation. The potential applications of cellular textile composites are the protective devices such as safety helmets, Energy absorbing vehicle door or other light weight devices where high Energy Absorption Capacity is of great importance.

L. Xia - One of the best experts on this subject based on the ideXlab platform.

  • Achieving high Energy Absorption Capacity in cellular bulk metallic glasses.
    Scientific reports, 2015
    Co-Authors: Shunhua Chen, K C Chan, L. Xia
    Abstract:

    Cellular bulk metallic glasses (BMGs) have exhibited excellent Energy-Absorption performance by inheriting superior strength from the parent BMGs. However, how to achieve high Energy Absorption Capacity in cellular BMGs is vital but mysterious. In this work, using step-by-step observations of the deformation evolution of a series of cellular BMGs, the underlying mechanisms for the remarkable Energy Absorption Capacity have been investigated by studying two influencing key factors: the peak stress and the decay of the peak stress during the plastic-flow plateau stages. An analytical model of the peak stress has been proposed and the predicted results agree well with the experimental data. The decay of the peak stress has been attributed to the geometry change of the macroscopic cells, the formation of shear bands in the middle of the struts and the “work-softening” nature of BMGs. The influencing factors such as the effect of the strut thickness and the number of unit cells have also been investigated and discussed. Strategies for achieving higher Energy Absorption Capacity in cellular BMGs have been proposed.

  • Pronounced Energy Absorption Capacity of cellular bulk metallic glasses
    Applied Physics Letters, 2015
    Co-Authors: S.-h. Chen, F F Wu, K C Chan, L. Xia
    Abstract:

    Cellular bulk metallic glasses (BMGs) with macroscopic cellular structures were designed and fabricated. The cellular BMGs exhibited remarkable Energy Absorption Capacity as compared with reported BMG foams and honeycombs. The enhanced Energy Absorption capability is attributed to the large plastic bending of the struts, the blunting of the cracks, and the large plastic deformation at the nodes. This work shows that, in cellular BMGs, the macroscopic cellular structures are more efficient in dissipating mechanical Energy than microscopic cellular structures, opening a window for developing Energy Absorption devices using BMGs.

S.w. Lam - One of the best experts on this subject based on the ideXlab platform.

  • comparison of different thermoplastic cellular textile composites on their Energy Absorption Capacity
    Composites Science and Technology, 2004
    Co-Authors: S.w. Lam, Xiao Ming Tao
    Abstract:

    This paper examines the Energy-Absorption behaviour and mechanism of various thermoplastic cellular textile composites with flat-topped grid-domed cellular structure under quasi-static compression and impact conditions. The fabrication process of compression molding the cellular textile composites made of UHMWPE/LDPE knitted, PET/PP knitted, and PET/PP non-woven systems, and injection molding the pure LDPE and pure PP cellular structure are described. The effects of impact Energy, fibre type, fibre volume fractions and fibre architecture on the Energy Absorption Capacity of the cellular composites, are discussed. The cell recovery after impact is also presented. The equivalent cell wall thickness is shown to be a pre-dominant factor governing the Energy Absorption Capacity of the cellular structure. With a constant thickness, increase in fibre volume fraction would lead to an increase in composite toughness as well as the Energy Absorption Capacity. Different deformation modes for both of the knitted and non-woven cellular composites, which are mainly due to their fibre architectures and cell wall thickness, are observed.

  • Comparison of different thermoplastic cellular textile composites on their Energy Absorption Capacity
    Composites Science and Technology, 2004
    Co-Authors: S.w. Lam, Xiao Ming Tao
    Abstract:

    This paper examines the Energy-Absorption behaviour and mechanism of various thermoplastic cellular textile composites with flat-topped grid-domed cellular structure under quasi-static compression and impact conditions. The fabrication process of compression molding the cellular textile composites made of UHMWPE/LDPE knitted, PET/PP knitted, and PET/PP non-woven systems, and injection molding the pure LDPE and pure PP cellular structure are described. The effects of impact Energy, fibre type, fibre volume fractions and fibre architecture on the Energy Absorption Capacity of the cellular composites, are discussed. The cell recovery after impact is also presented. The equivalent cell wall thickness is shown to be a pre-dominant factor governing the Energy Absorption Capacity of the cellular structure. With a constant thickness, increase in fibre volume fraction would lead to an increase in composite toughness as well as the Energy Absorption Capacity. Different deformation modes for both of the knitted and non-woven cellular composites, which are mainly due to their fibre architectures and cell wall thickness, are observed.Institute of Textiles and Clothin

  • POLYMERIC CELLULAR TEXTILE COMPOSITES FOR Energy Absorption
    Research Journal of Textile and Apparel, 2002
    Co-Authors: S.w. Lam, Xiao Ming Tao
    Abstract:

    This review paper is concerned with polymeric cellular textile composites with high specific Energy Absorption Capacity. These cellular textile composites, particularly grid domed structure, have been characterized and the deformation mechanisms are described. The Energy Absorption Capacity of the cellular structures may be varied by the geometrical parameters, cell density and the panel arrangement. Various fabrication processes of polymeric cellular textile composties are described, covering selection of reinforcing fibre and thermoset resin/ thermoplastic matrix material systems, methods of preform preparation by textile processing, and the manufacturing techniques of composite consolidation. The potential applications of cellular textile composites are the protective devices such as safety helmets, Energy absorbing vehicle door or other light weight devices where high Energy Absorption Capacity is of great importance.

S. Prabavathy - One of the best experts on this subject based on the ideXlab platform.

  • Study on Energy Absorption Capacity of Steel–Polyester Hybrid Fiber Reinforced Concrete Under Uni-axial Compression
    Journal of The Institution of Engineers (India): Series A, 2018
    Co-Authors: C. Chella Gifta, S. Prabavathy
    Abstract:

    This work presents the Energy Absorption Capacity of hybrid fiber reinforced concrete made with hooked end steel fibers (0.5 and 0.75%) and straight polyester fibers (0.5, 0.8, 1.0 and 2.0%). Compressive toughness (Energy Absorption Capacity) under uni-axial compression was evaluated on 100 × 200 mm size cylindrical specimens with varying steel and polyester fiber content. Efficiency of the hybrid fiber reinforcement is studied with respect to fiber type, size and volume fractions in this investigation. The vertical displacement under uni-axial compression was measured under the applied loads and the load–deformation curves were plotted. From these curves the toughness values were calculated and the results were compared with steel and polyester as individual fibers. The hybridization of 0.5% steel + 0.5% polyester performed well in post peak region due to the addition of polyester fibers with steel fibers and the Energy Absorption value was 23% greater than 0.5% steel FRC. Peak stress values were also higher in hybrid series than single fiber and based on the results it is concluded that hybrid fiber reinforcement improves the toughness characteristics of concrete without affecting workability.

  • study on Energy Absorption Capacity of steel polyester hybrid fiber reinforced concrete under uni axial compression
    Journal of The Institution of Engineers : Series A, 2018
    Co-Authors: Chella C Gifta, S. Prabavathy
    Abstract:

    This work presents the Energy Absorption Capacity of hybrid fiber reinforced concrete made with hooked end steel fibers (0.5 and 0.75%) and straight polyester fibers (0.5, 0.8, 1.0 and 2.0%). Compressive toughness (Energy Absorption Capacity) under uni-axial compression was evaluated on 100 × 200 mm size cylindrical specimens with varying steel and polyester fiber content. Efficiency of the hybrid fiber reinforcement is studied with respect to fiber type, size and volume fractions in this investigation. The vertical displacement under uni-axial compression was measured under the applied loads and the load–deformation curves were plotted. From these curves the toughness values were calculated and the results were compared with steel and polyester as individual fibers. The hybridization of 0.5% steel + 0.5% polyester performed well in post peak region due to the addition of polyester fibers with steel fibers and the Energy Absorption value was 23% greater than 0.5% steel FRC. Peak stress values were also higher in hybrid series than single fiber and based on the results it is concluded that hybrid fiber reinforcement improves the toughness characteristics of concrete without affecting workability.

Omid Razmkhah - One of the best experts on this subject based on the ideXlab platform.

  • Effect of strain rate on deformation behavior of aluminum matrix composites with Al2O3 nanoparticles
    Materials Science and Engineering: A, 2019
    Co-Authors: Z. Zaiemyekeh, Gholamhossein Liaghat, Hamed Ahmadi, Muhammad Kashif Khan, Omid Razmkhah
    Abstract:

    Abstract This study aims to investigate the quasi-static and high strain rate deformation of an aluminum-based metal matrix composite reinforced with Al2O3 nanoparticles. The addition of Al2O3 nanoparticles with an optimal weight percentage increased the strength and Energy Absorption Capacity of the composite material. The deformation characteristics of the material were found to be strain rate sensitive. It was concluded that the usage of an optimal weight percentage of nanoparticles results in a markedly higher Energy Absorption Capacity in a variety of strain rates of deformation. Moreover, the Energy Absorption Capacity of the present metal matrix composites increased significantly at the higher strain rates of deformation. It was found that the excessive addition of nanoparticles to the metal matrix decreases the Energy Absorption Capacity as well as strain rate sensitivity of the composite material.