The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Qiuyun Yin - One of the best experts on this subject based on the ideXlab platform.
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dynamic Compressive Behaviour of sandwich panels with lattice truss core filled by shear thickening fluid
International Journal of Impact Engineering, 2020Co-Authors: Qiuyun Yin, Chao HuangAbstract:Abstract The Compressive Behaviour of sandwich panels with lattice truss core filled by shear thickening fluid (SPLTC-STF) at high strain-rates is performed analytically and numerically. Firstly, a hydrodynamic constitutive model for the shear thickening fluid (STF) involving shear thinning, shear thickening, and hydrostatic compressibility is undertaken to describe the dynamic Behaviour of the STF. Then an analytical model based on the squeezing flow of viscous fluids is proposed. The squeezing resistance of the STF between the two panels of the SPLTC under various loading velocities is analysed using a fluid-structure interaction (FSI) simulation, by which the constitutive parameters of the STF are obtained. Finally, the dynamic response of the SPLTC-STF involving buckling and post-buckling of core struts in the STF is investigated using the FSI method. The enhanced energy absorption capacity of the SPLTC-STF observed in Ref [1] is numerically interpreted. The effects of shear thickening Behaviour of STF on the dynamic response of SPLTC-STF are predicted, providing a method of optimal design for STF filled sandwich panels over a wide range of impulse loadings for dynamic energy absorption.
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experimental study on dynamic Compressive Behaviour of sandwich panel with shear thickening fluid filled pyramidal lattice truss core
International Journal of Mechanical Sciences, 2018Co-Authors: Kailu Xiao, Qiuyun Yin, Fachun Zhong, Chenguang HuangAbstract:Abstract The dynamic Compressive Behaviour of sandwich panels with shear thickening fluid (STF) filled pyramidal lattice truss cores at high strain rates is studied and compared with that of pure STF as well as the sandwich panels with empty and water filled pyramidal lattice truss cores by modified split Hopkinson pressure bar (SHPB) apparatus. The dynamic Compressive strengths of the sandwich panels while filled with STF increase significantly when compared to the strengths of the sandwich panels with empty pyramidal lattice truss cores. It is interesting to note that the sandwich panel with the STF filled pyramidal lattice truss core shows “1 + 1 >> 2” dynamic energy absorption Behaviour. The excellent energy absorption Behaviour of the sandwich panel with STF filled truss core is interpreted by the transformation of deformation modes of core beams from non-symmetry to symmetry after filled with the STF through strong interaction between the buckling Behaviour of pyramidal lattice truss core and the shear thickening Behaviour of the filled STF material.
Luming Shen - One of the best experts on this subject based on the ideXlab platform.
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Compressive Behaviour of shear thickening fluid with concentrated polymers at high strain rates
Materials & Design, 2018Co-Authors: Hongjian Wang, Shengzhe Wang, Li Chang, Luming ShenAbstract:Abstract Shear-thickening fluids (STFs) exhibit solid-like Behaviour at high strain rates. This study focused on STFs with styrene/acrylate particles at 58% volume fraction. The theoretical density of the STFs was 29% lighter than that of the STFs with 54% volume fraction silica particles. The microstructure and dispersion of the particles were measured, together with the rheological Behaviour of the STFs. Then, the high-strain-rate Compressive responses of the STFs were studied using a split Hopkinson pressure bar (SHPB). Along with the implementation of high-speed photography at 100,000 FPS during testing, the stress-strain relations of the STFs at high strain rates were determined. The results showed that the transition of fully solid-like STFs occurred at the mean strain rate of 668.3 ± 109.7 s− 1. As well, the modulus of the solid-like STFs was first reported as 303.7 ± 78.0 MPa, lower than the level reported for bulk styrene/acrylate copolymers. The peak stress and impact toughness of the STFs were also determined and were compared to those of silica-based STFs from a previous experiment. In addition, the dynamic Behaviour of the solid-like STFs was modelled by a phenomenological method and was further used to simulate the SHPB process by finite element analysis.
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effect of strain rate on Compressive Behaviour of high strength concrete after exposure to elevated temperatures
Fire Safety Journal, 2016Co-Authors: Jianzhuang Xiao, Qinghai Xie, Luming ShenAbstract:Abstract The effect of strain rate on the Compressive Behaviour of high-strength concrete (HSC) after exposure to elevated temperatures was experimentally investigated. 45 HSC prisms were heated up to 20, 200, 400, 600 and 800 °C. The pre-heated prisms were then axially loaded at a quasi-static strain rate of 10−5 s−1 as well as two aftershock dynamic strain rates of 10−3 and 0.067 s−1, respectively. The test results indicate that the higher the temperature and strain rate are, the larger the number of cracks and fragments will be. Both the residual Compressive strength and elastic modulus of HSC decrease with the increase of elevated temperatures, whereas they increase as the strain rate increases. Moreover, the peak strain is enhanced by the elevated temperature but hardly influenced by the strain rate. Finally, the stress–strain relationship and dynamic increase factor (DIF) of HSC after exposure to elevated temperatures are proposed.
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Compressive Behaviour of recycled aggregate concrete under impact loading
Cement and Concrete Research, 2015Co-Authors: Jianzhuang Xiao, Long Li, Luming Shen, Chi Sun PoonAbstract:Abstract The Compressive Behaviour of recycled aggregate concrete (RAC) with different recycled coarse aggregate (RCA) replacement percentages was experimentally investigated under quasi-static to high strain rate loading. Quasi-static tests at a strain rate of 10− 5/s were first carried out using a stiff-framed servo-hydraulic machine. Impacting tests at strain rates ranging from 101/s to 102/s were then performed using a 74 mm-diameter Split Hopkinson Pressure Bar (SHPB) facility. The strain rate effects on the failure pattern, Compressive strength, initial elastic modulus and peak strain were studied. The results showed that the Compressive strength and initial elastic modulus increased with increasing strain rate while the peak strain did not display clear strain rate dependence. At high strain rates the Compressive strength decreased with increasing RCA replacement percentage, whereas the dynamic increase factor (DIF) showed a reverse tendency. Furthermore, the dynamic Compressive strength of wet RAC was lower than that of naturally dried RAC.
Chenguang Huang - One of the best experts on this subject based on the ideXlab platform.
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experimental study on dynamic Compressive Behaviour of sandwich panel with shear thickening fluid filled pyramidal lattice truss core
International Journal of Mechanical Sciences, 2018Co-Authors: Kailu Xiao, Qiuyun Yin, Fachun Zhong, Chenguang HuangAbstract:Abstract The dynamic Compressive Behaviour of sandwich panels with shear thickening fluid (STF) filled pyramidal lattice truss cores at high strain rates is studied and compared with that of pure STF as well as the sandwich panels with empty and water filled pyramidal lattice truss cores by modified split Hopkinson pressure bar (SHPB) apparatus. The dynamic Compressive strengths of the sandwich panels while filled with STF increase significantly when compared to the strengths of the sandwich panels with empty pyramidal lattice truss cores. It is interesting to note that the sandwich panel with the STF filled pyramidal lattice truss core shows “1 + 1 >> 2” dynamic energy absorption Behaviour. The excellent energy absorption Behaviour of the sandwich panel with STF filled truss core is interpreted by the transformation of deformation modes of core beams from non-symmetry to symmetry after filled with the STF through strong interaction between the buckling Behaviour of pyramidal lattice truss core and the shear thickening Behaviour of the filled STF material.
Dong Ruan - One of the best experts on this subject based on the ideXlab platform.
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Compressive Behaviour of closed cell aluminium foams at high strain rates
Composites Part B-engineering, 2010Co-Authors: Jianhu Shen, Dong RuanAbstract:Abstract It has been well established that ALPORAS® foams is a strain rate sensitive material. However, the strain rate effect is not well quantified as it is not unusual for strain rate to vary during high speed compression. Moreover, according to previous research, aluminium foams, especially ALPORAS® foams, behave differently at low and high strain rates. Therefore, different plastic deformation mechanisms are expected for low and high strain rate loadings as a result of micro-inertia of cell walls. In this paper, the strain rate effect on the energy dissipation capacity of ALPORAS® foam was investigated experimentally by using a High Rate Instron Test System, with cross-head speed up to 10 m/s. The Compressive tests were conducted over strain rates in the range of 1 × 10−3 to 2.2 × 102 s−1, with each test being at a fairly constant strain rate. An energy efficiency method was adopted to obtain the densification strain and plateau stress. The effect of strain rate and the foam density was well presented by empirical constitutive models. The experimental data were also discussed with reference to the recent results by other researchers but with different range of strain rates. An attempt has been made to qualitatively explain the observed decrease of densification strain with strain rate.
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Compressive Behaviour of aluminium foams at low and medium strain rates
Composite Structures, 2002Co-Authors: Dong Ruan, F L Chen, Elias SioresAbstract:Abstract Compressive Behaviour of CYMAT aluminium foams with relative densities ranged from 5% to 20% has been studied experimentally in this paper. An MTS machine is employed to apply a Compressive load at strain rates of 10 −3 –10 +1 s −1 to these closed-cell aluminium foams. It has been found that the plateau stress is insensitive to the strain rate and is related to the relative density by a power law. Deformation is not uniform over the whole sample: it first occurs in the weakest band, followed by the next weakest bands after the first one has been completely crushed.
Chao Huang - One of the best experts on this subject based on the ideXlab platform.
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dynamic Compressive Behaviour of sandwich panels with lattice truss core filled by shear thickening fluid
International Journal of Impact Engineering, 2020Co-Authors: Qiuyun Yin, Chao HuangAbstract:Abstract The Compressive Behaviour of sandwich panels with lattice truss core filled by shear thickening fluid (SPLTC-STF) at high strain-rates is performed analytically and numerically. Firstly, a hydrodynamic constitutive model for the shear thickening fluid (STF) involving shear thinning, shear thickening, and hydrostatic compressibility is undertaken to describe the dynamic Behaviour of the STF. Then an analytical model based on the squeezing flow of viscous fluids is proposed. The squeezing resistance of the STF between the two panels of the SPLTC under various loading velocities is analysed using a fluid-structure interaction (FSI) simulation, by which the constitutive parameters of the STF are obtained. Finally, the dynamic response of the SPLTC-STF involving buckling and post-buckling of core struts in the STF is investigated using the FSI method. The enhanced energy absorption capacity of the SPLTC-STF observed in Ref [1] is numerically interpreted. The effects of shear thickening Behaviour of STF on the dynamic response of SPLTC-STF are predicted, providing a method of optimal design for STF filled sandwich panels over a wide range of impulse loadings for dynamic energy absorption.