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L. Xia - One of the best experts on this subject based on the ideXlab platform.
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Achieving high energy Absorption Capacity in cellular bulk metallic glasses.
Scientific reports, 2015Co-Authors: Shunhua Chen, K C Chan, L. XiaAbstract: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.
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Pronounced energy Absorption Capacity of cellular bulk metallic glasses
Applied Physics Letters, 2015Co-Authors: S.-h. Chen, F F Wu, K C Chan, L. XiaAbstract: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. Prabavathy - One of the best experts on this subject based on the ideXlab platform.
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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, 2018Co-Authors: C. Chella Gifta, S. PrabavathyAbstract: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.
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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, 2018Co-Authors: C. Chella Gifta, S. PrabavathyAbstract: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.
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study on energy Absorption Capacity of steel polyester hybrid fiber reinforced concrete under uni axial compression
Journal of The Institution of Engineers : Series A, 2018Co-Authors: Chella C Gifta, S. PrabavathyAbstract: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.
Xiao Ming Tao - One of the best experts on this subject based on the ideXlab platform.
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comparison of different thermoplastic cellular textile composites on their energy Absorption Capacity
Composites Science and Technology, 2004Co-Authors: S.w. Lam, Xiao Ming TaoAbstract: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.
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Non-woven fabric reinforced cellular textile composites with improved energy Absorption Capacity
Composites Technologies For 2020, 2004Co-Authors: S.w. Laml, Xiao Ming Tao, T.x. YuAbstract: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.
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Comparison of different thermoplastic cellular textile composites on their energy Absorption Capacity
Composites Science and Technology, 2004Co-Authors: S.w. Lam, Xiao Ming TaoAbstract: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
Josephin Alex - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation on water Absorption Capacity of RHA-added cement concrete
Environmental Science and Pollution Research, 2020Co-Authors: Ambedkar Balraj, Dhanalakshmi Jayaraman, Jagannathan Krishnan, Josephin AlexAbstract:In the recent past, partial replacement of cement by rice husk ash (RHA) in concrete is a prime focus of global researchers for sustainable development in energy and environmental aspects. The present investigation aims at testing the water Absorption Capacity of the different types and sizes of the RHA-incorporated cement concrete. A design of experiments (DOE) was conducted using the Taguchi method to develop an L_27 matrix to assess the individual effects of each variable. From the experimental study, decreasing the RHA size and increasing the RHA loading, higher bulk density, and surface area led to decreasing the water Absorption Capacity of the RHA-blended cement concrete during curing. Furthermore, 20 wt% replacement of cement by RHA in concrete furnishes the 3-fold decrease of water Absorption Capacity compared to normal concrete (without RHA). An empirical model was developed to predict the water Absorption Capacity of the RHA-incorporated cement concrete. The model indicates that RHA loading, silica content, and specific surface area are the key factors influencing the water Absorption Capacity of the concrete. And the model appears to be able to predict the water Absorption Capacity of concrete quite accurately with > 95% confidence level.
Hossein Fashandi - One of the best experts on this subject based on the ideXlab platform.
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the effect of specific surface area of macro fibers on energy Absorption Capacity of concrete
Journal of The Textile Institute, 2019Co-Authors: Rouhollah Rostami, Sayyed Mahdi Abtahi, Khaled Sanginabadi, Davood Mostofinejad, Mohammad Zarrebini, Hossein FashandiAbstract:Energy Absorption Capacity is the salient property of concrete. Reinforcement of concrete with macro fibers is one of the techniques that has led to enhancement of this important feature of concrete. However, the effect of specific surface area of melt-spun polypropylene macro fibers has hardly been studied so far. In this work, the effect of this parameter on mechanical behavior of fiber reinforced concrete (FRC) was investigated. Diameter of macro fibers was varied by changing the melt feeding rate and fiber draw ratio. Changes in fibers diameter affect fibers specific surface area, which in turn influences the adhesion of fibers to the matrix in FRCs. In order to evaluate the FRCs behavior, bending tests were conducted and the area under load-displacement curves was studied. It was found that increase in specific surface area of fibers results in considerable increase in energy Absorption Capacity of the FRCs. Concrete reinforced with the larger diameter fibers exhibited 6× energy Absorption Capacity than the reference sample. This was found to be in line with the 14× energy Absorption Capacity of sample which was reinforced by smaller diameter fibers. This was attributed to the increase in total contact area between the finer fibers and the matrix as a direct consequence of the increase in number of fibers for a given fiber volume fraction.
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The effect of specific surface area of macro fibers on energy Absorption Capacity of concrete
Journal of The Textile Institute, 2018Co-Authors: Rouhollah Rostami, Sayyed Mahdi Abtahi, Khaled Sanginabadi, Davood Mostofinejad, Mohammad Zarrebini, Hossein FashandiAbstract:AbstractEnergy Absorption Capacity is the salient property of concrete. Reinforcement of concrete with macro fibers is one of the techniques that has led to enhancement of this important feature of...
