The Experts below are selected from a list of 2415 Experts worldwide ranked by ideXlab platform
Qasim Hussain Shah - One of the best experts on this subject based on the ideXlab platform.
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impact resistance of a rectangular polycarbonate armor plate subjected to single and multiple impacts
International Journal of Impact Engineering, 2009Co-Authors: Qasim Hussain ShahAbstract:Abstract In the present work the plastic deformation of a thin rectangular polycarbonate armor plate subjected to single and multiple impacts was investigated in detail. The impacts were conducted on a horizontal and diagonal path to explore the plate vulnerability against the in-coming single and multiple projectiles striking at various locations. Single impacts revealed the overall trend in plate dent sizes and thickness reductions on the horizontal and diagonal paths. Results were compared with previous research [Shah QH, Abakr YA. Effect of distance from the support on the penetration mechanism of Clamped circular polycarbonate armor plates. International Journal of Impact Engineering 2008;35:1244–50] conducted on circular armor plate for validation purposes. The single impact data scatter necessitated to conduct repeated impact tests at reduced number of locations to search for a definite answer for the possible failure process in the vicinity of the Clamped Edges of the plate. An accelerated plastic deformation resulting in early perforation was found to occur in the diagonal plate corner compared to the plate center impact position or close to a straight Clamped Edge. Multiple impact results presented can be significantly helpful in designing rectangular shape polycarbonate armor plates to enhance safety. LSDYNA was used to simulate the impact event for the plate midpoint, the horizontal Edge, and the diagonal Edge. The results show a close agreement with the experimental work.
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impact resistance of a rectangular polycarbonate armor plate subjected to single and multiple impacts
International Journal of Impact Engineering, 2009Co-Authors: Qasim Hussain ShahAbstract:Abstract In the present work the plastic deformation of a thin rectangular polycarbonate armor plate subjected to single and multiple impacts was investigated in detail. The impacts were conducted on a horizontal and diagonal path to explore the plate vulnerability against the in-coming single and multiple projectiles striking at various locations. Single impacts revealed the overall trend in plate dent sizes and thickness reductions on the horizontal and diagonal paths. Results were compared with previous research [Shah QH, Abakr YA. Effect of distance from the support on the penetration mechanism of Clamped circular polycarbonate armor plates. International Journal of Impact Engineering 2008;35:1244–50] conducted on circular armor plate for validation purposes. The single impact data scatter necessitated to conduct repeated impact tests at reduced number of locations to search for a definite answer for the possible failure process in the vicinity of the Clamped Edges of the plate. An accelerated plastic deformation resulting in early perforation was found to occur in the diagonal plate corner compared to the plate center impact position or close to a straight Clamped Edge. Multiple impact results presented can be significantly helpful in designing rectangular shape polycarbonate armor plates to enhance safety. LSDYNA was used to simulate the impact event for the plate midpoint, the horizontal Edge, and the diagonal Edge. The results show a close agreement with the experimental work.
Sumit Kumar Jindal - One of the best experts on this subject based on the ideXlab platform.
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design modelling and simulation of mems piezo resistive pressure sensor with Clamped Edge silicon carbide circular diaphragm
Social Science Research Network, 2018Co-Authors: Maitreyi Shaklya, Sai Pratyusha Magam, Sumit Kumar JindalAbstract:Microelectromechanical Systems (MEMS) pressure sensors are premeditated and characterised in this paper. Sensors with piezo-resistive transduction mechanism have been preferred due to their various benefits such as small dimension, high sensitivity, low cost and simple fabrication. The paper tries to shift focus from the conventional CMOS material in order to draw attention towards silicon carbide based piezo-resistors. Deflection and stress of the piezo-resistive pressure sensors have been computed for silicon carbide Clamped Edge circular shaped diaphragm according to the theory of elasticity. The two most important characteristics of a pressure sensor i.e. sensitivity and linearity have been reported for the (0-100) psi pressure range. Simulation of results obtained have been done to state the significance of parameters such as effective resistor length, sensitivity etc.
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a complete analytical model for Clamped Edge circular diaphragm non touch and touch mode capacitive pressure sensor
Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2016Co-Authors: Sumit Kumar Jindal, Ankush Mahajan, Sanjeev Kumar RaghuwanshiAbstract:Capacitive pressure sensor have become good substitute for piezoresistive pressure sensor because of low power consumption. In order to evaluate the characteristic profile for touch mode micro pressure sensor an accurate and simple model needs to be designed. Hence preferable analytical model is necessary to design and characterize the device. Lot of study has been done on touch mode capacitive sensing but no elaborate work has been presented to clearly understand the underlying expressions and the role of key performance parameters. With this step by step theoretical evaluation model the key performance parameter such as deflection, capacitance and sensitivity can be easily studied for both non-touch and touch mode capacitive pressure sensor. The next aspect has been to simulate the findings in order to validate the results and hence MATLAB has been introduced. It also eliminates the need for design using FEM and hence the study becomes lot easier.
H. Zhang - One of the best experts on this subject based on the ideXlab platform.
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calibration of eringen s small length scale coefficient for buckling circular and annular plates via hencky bar net model
Applied Mathematical Modelling, 2020Co-Authors: H. Zhang, C M Wang, Noel Challamel, Wenhao PanAbstract:Abstract This paper is focused on the modeling of circular and annular graphene sheets via Hencky bar-net model (HBM 1 ) and calibrating the Eringen's small length scale coefficient e0 in Eringen's nonlocal theory. The buckling solutions of circular and annular graphene sheets based on Eringen's nonlocal continuum plate theory are first obtained. On the other hand, HBM is developed to model the same structure from the discrete view. HBM is a grid system comprising rigid bars and arcs connected by frictionless hinges with elastic rotational and torsional springs. By regarding the length of straight segments in HBM equal to the characteristic length of Eringen's nonlocal model (ENM 2 ) and matching their solutions, the Eringen's small length scale coefficient e0 is calibrated. It is found that for circular graphene sheet, e0 = 0.258 for Clamped Edge and e0 = 0.300 for simply supported Edge. For annular graphene sheet, e0 is dependent on the inner to outer radius ratio χ and boundary conditions. The scale coefficient e0 takes 0.307–0.367 for Clamped Edges while 0.219–0.290 for simply supported Edges with χ varying from 0.2 to 0.8. Another finding is that the graphene sheet will buckle with a very small load when its dimension is large, regardless of models adopted. However for small dimensions, ENM and HBM predict lower buckling loads than the classical local model because the scale effect is more obvious.
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Hencky bar-net model for buckling and vibration analyses of rectangular plates with non-uniform thickness
Engineering Structures, 2018Co-Authors: Eugenio Ruocco, H. Zhang, Chien Ming WangAbstract:Abstract The Hencky bar-net model, developed from a finite difference plate model, is proposed for buckling and vibration analyses of rectangular plates with non-uniform thickness. The Hencky bar net comprises rigid bars joined by elastic rotational springs to allow for bending flexibility and diagonal springs in each panel to simulate the twisting effect. The non-uniform plate thickness can be readily handled by adjusting the spring stiffnesses. For generality, the Edges of the plate are elastically restrained where the special cases are the classical boundary conditions of simply supported Edge, Clamped Edge and free Edge. The plate is subjected to uniaxial load or biaxial loads. In order to demonstrate the versatility and the accuracy of the Hencky bar model, some plate problems are analysed and the obtained results compared with existing results reported in the open literature.
M Y Osman - One of the best experts on this subject based on the ideXlab platform.
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dr large deflection analysis of orthotropic mindlin plates with simply supported and Clamped Edge conditions
Composites Engineering, 1991Co-Authors: G J Turvey, M Y OsmanAbstract:Abstract First-order orthotropic shear deformation equations for the nonlinear elastic bending response of rectangular plates are introduced. Their solution using a computer program based on a noninterlacing finite-difference implementation of the Dynamic Relaxation (DR) method is outlined. The convergence and accuracy of the DR solutions for elastic small and large deflection response are established by comparison with various exact and approximate solutions. A number of new results are presented for uniformly-loaded orthotropic square plates which serve to quantify the effects of thickness ratio and Edge support condition on the plate response.
Charles Chinwuba Ike - One of the best experts on this subject based on the ideXlab platform.
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Mathematical solutions for the flexural analysis of Mindlin’s first order shear deformable circular plates
JVE International, 2018Co-Authors: Charles Chinwuba IkeAbstract:In this work, the problem of first order shear deformable solid circular plate under transverse load was solved mathematically. The problem considered was assumed axisymmetric. The plate and loading were considered axisymmetric. The problem was defined as a boundary value problem of a system of differential equations of equilibrium in terms of the stress resultants and the stress – resultants – displacement relations. The set of equations were considered simultaneously to express them in variable separable form. The mathematical technique of separation of variables was then used to obtain solutions for the unknown generalised displacements. Specific problems of Clamped Edge plates and simply supported Edge plates under uniformly distributed load and point load at the centre were considered and solved using the same technique of separation of variables. The mathematical expressions obtained showed that in all cases, the deflection was expressible in terms of flexural and shear components. The maximum deflection was found to occur at the plate centre as is expected from the symmetrical nature of the problem. The shear component of the transverse deflection was found to significantly increase with significant increase in the ratio of the plate thickness to the radius (h/r0)