The Experts below are selected from a list of 17151 Experts worldwide ranked by ideXlab platform
Daining Fang - One of the best experts on this subject based on the ideXlab platform.
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an equivalent model for Sandwich Panel with double directional trapezoidal corrugated core
Journal of Sandwich Structures and Materials, 2019Co-Authors: Huimin Li, Lei Ge, Haoran Su, Tianyi Feng, Daining FangAbstract:A novel Sandwich Panel with double-directional corrugated core is proposed in this paper. This complex-corrugated core makes the conventional detailed finite element analysis of large structures a ...
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design and analysis of integrated thermal protection system based on lightweight c sic pyramidal lattice core Sandwich Panel
Materials & Design, 2016Co-Authors: Kai Wei, Xiangmeng Cheng, Daining Fang, Weibin WenAbstract:Abstract Thermal protection system (TPS) plays the key role to successful development of hypersonic vehicles. Here, a novel structurally and thermally integrated thermal protection system (ITPS) based on the lightweight C/SiC pyramidal core lattice Sandwich Panel is proposed. This ITPS integrates advantages of low areal density and high temperature resistance up to 1600 °C. Heat transfer characteristics and compressive responses of the C/SiC Sandwich Panel are established in advance. The results demonstrate that filling alumina fibers in the pore significantly reduce the effective thermal conductivity from 2.45–4.83 W/m °C to no more than 0.7 W/m °C. The critical relative density is determinated for the failure models under aerodynamic pressure load. Meanwhile, an analysis procedure of the ITPS is exclusively established under typical aerodynamic heat flux and pressure load. With fulfillment of both temperature and mechanical constraints, minimum areal density is obtained. Compared with current metal corrugated core ITPS, the ITPS proposed here significantly raises the temperature limitation up to 1600 °C and reduces the areal density up to 35%, and is very promising for potential application in hypersonic vehicles.
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fabrication and heat transfer characteristics of c sic pyramidal core lattice Sandwich Panel
Applied Thermal Engineering, 2015Co-Authors: Kai Wei, Xiangmeng Cheng, Yongmao Pei, Rubing Zhang, Daining FangAbstract:Abstract Lightweight C/SiC pyramidal core lattice Sandwich Panel was proposed and fabricated for potential applications as hot structure and thermal protection system (TPS). The heat transfer characteristics of C/SiC lattice Sandwich Panel were measured from 600 to 1150 °C through an aerodynamic heating simulation experimental system. Temperature distribution on the back surface of the lattice Sandwich Panel was obtained through periodical thermocouple assignment. Heat insulation effects under different temperatures were also investigated. Finally, a three dimensional finite element simulation model was built to calculate the heat transfer of the C/SiC lattice Sandwich Panel. The equivalent thermal conductivity of the C/SiC lattice Sandwich Panel varied from 1.98 to 4.95 W/(m °C) when the front surface temperature increased from 600 to 1150 °C. It is believed that these results can provide a foundational understanding on the heat transfer characteristics of C/SiC lattice Sandwich Panel.
Kai Wei - One of the best experts on this subject based on the ideXlab platform.
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design and analysis of integrated thermal protection system based on lightweight c sic pyramidal lattice core Sandwich Panel
Materials & Design, 2016Co-Authors: Kai Wei, Xiangmeng Cheng, Daining Fang, Weibin WenAbstract:Abstract Thermal protection system (TPS) plays the key role to successful development of hypersonic vehicles. Here, a novel structurally and thermally integrated thermal protection system (ITPS) based on the lightweight C/SiC pyramidal core lattice Sandwich Panel is proposed. This ITPS integrates advantages of low areal density and high temperature resistance up to 1600 °C. Heat transfer characteristics and compressive responses of the C/SiC Sandwich Panel are established in advance. The results demonstrate that filling alumina fibers in the pore significantly reduce the effective thermal conductivity from 2.45–4.83 W/m °C to no more than 0.7 W/m °C. The critical relative density is determinated for the failure models under aerodynamic pressure load. Meanwhile, an analysis procedure of the ITPS is exclusively established under typical aerodynamic heat flux and pressure load. With fulfillment of both temperature and mechanical constraints, minimum areal density is obtained. Compared with current metal corrugated core ITPS, the ITPS proposed here significantly raises the temperature limitation up to 1600 °C and reduces the areal density up to 35%, and is very promising for potential application in hypersonic vehicles.
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fabrication and heat transfer characteristics of c sic pyramidal core lattice Sandwich Panel
Applied Thermal Engineering, 2015Co-Authors: Kai Wei, Xiangmeng Cheng, Yongmao Pei, Rubing Zhang, Daining FangAbstract:Abstract Lightweight C/SiC pyramidal core lattice Sandwich Panel was proposed and fabricated for potential applications as hot structure and thermal protection system (TPS). The heat transfer characteristics of C/SiC lattice Sandwich Panel were measured from 600 to 1150 °C through an aerodynamic heating simulation experimental system. Temperature distribution on the back surface of the lattice Sandwich Panel was obtained through periodical thermocouple assignment. Heat insulation effects under different temperatures were also investigated. Finally, a three dimensional finite element simulation model was built to calculate the heat transfer of the C/SiC lattice Sandwich Panel. The equivalent thermal conductivity of the C/SiC lattice Sandwich Panel varied from 1.98 to 4.95 W/(m °C) when the front surface temperature increased from 600 to 1150 °C. It is believed that these results can provide a foundational understanding on the heat transfer characteristics of C/SiC lattice Sandwich Panel.
Dushyanth Sirivolu - One of the best experts on this subject based on the ideXlab platform.
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a wave propagation model for the high velocity impact response of a composite Sandwich Panel
International Journal of Impact Engineering, 2010Co-Authors: M. S. Hoo Fatt, Dushyanth SirivoluAbstract:A solution methodology to predict the residual velocity of a hemispherical-nose cylindrical projectile impacting a composite Sandwich Panel at high velocity is presented. The term high velocity impact is used to describe impact scenarios where the projectile perforates the Panel and exits with a residual velocity. The solution is derived from a wave propagation model involving deformation and failure of facesheets, through-thickness propagation of shock waves in the core, and through-thickness core shear failure. Equations of motion for the projectile and effective masses of the facesheets and core as the shock waves travel through Sandwich Panel are derived using Lagrangian mechanics. The analytical approach is mechanistic involving no detail account of progressive damage due to delamination and debonding but changes in the load-bearing resistance of the Sandwich Panel due to failure and complete loss of resistance from the facesheets and core during projectile penetration. The predicted transient deflection and velocity of the projectile and Sandwich Panel compared fairly well with results from finite element analysis. Analytical predictions of the projectile residual velocities were also found to be in good agreement with experimental data.
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a wave propagation model for the high velocity impact response of a composite Sandwich Panel
International Journal of Impact Engineering, 2010Co-Authors: M. S. Hoo Fatt, Dushyanth SirivoluAbstract:A solution methodology to predict the residual velocity of a hemispherical-nose cylindrical projectile impacting a composite Sandwich Panel at high velocity is presented. The term high velocity impact is used to describe impact scenarios where the projectile perforates the Panel and exits with a residual velocity. The solution is derived from a wave propagation model involving deformation and failure of facesheets, through-thickness propagation of shock waves in the core, and through-thickness core shear failure. Equations of motion for the projectile and effective masses of the facesheets and core as the shock waves travel through Sandwich Panel are derived using Lagrangian mechanics. The analytical approach is mechanistic involving no detail account of progressive damage due to delamination and debonding but changes in the load-bearing resistance of the Sandwich Panel due to failure and complete loss of resistance from the facesheets and core during projectile penetration. The predicted transient deflection and velocity of the projectile and Sandwich Panel compared fairly well with results from finite element analysis. Analytical predictions of the projectile residual velocities were also found to be in good agreement with experimental data.
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High Velocity Impact of a Composite Sandwich Panel
Sustainability, 2008Co-Authors: M. S. Hoo Fatt, Dushyanth SirivoluAbstract:This paper presents analytical solutions for the deformation response of a composite Sandwich Panel subjected to high velocity impact by a rigid blunt, cylindrical projectile. The solution is derived from a 2-degrees-of-freedom model for the Sandwich Panel involving local indentation, core crushing, and global bending/shear deformations. An example is given for a composite Sandwich Panel consisting of orthotropic E-glass vinyl ester facesheets and PVC H100 foam core and subjecting to the high velocity impact of a blunt cylindrical projectile. The analytical solution for the local indentation and global deflection under the projectile was found to be within 15% of finite element analysis results.
Qianhua Cheng - One of the best experts on this subject based on the ideXlab platform.
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free and forced vibration of simply supported orthotropic Sandwich Panel
Computers & Structures, 2001Co-Authors: T.s. Lok, Qianhua ChengAbstract:Abstract A three-dimensional (3-D) Sandwich Panel, which is characterized by two thin flat sheets and a core Sandwiched between them, is a relatively complex structure. The degree of complexity depends on the type of core used. Despite the complexity, the dynamic flexural behavior of a 3-D, thin-walled Sandwich Panel may be represented by the response of an equivalent two-dimensional (2-D), homogeneous, orthotropic, thick-plate continuum, provided its plan size is many times larger than its depth. Seven elastic constants represent the homogeneous, orthotropic, thick-plate continuum. These constants vary with the core configuration. In this paper, a truss-core Sandwich Panel unit, which departs from conventional forms, is introduced. Elastic constants for the truss-core Panel have been derived and are presented. Using these equivalent constants in conjunction with a closed-form solution, free and forced vibration response of the Sandwich Panel as an orthotropic, thick-plate continuum are derived. A double series solution is used for the simply supported orthotropic thick plate. This technique requires considerably less computational effort than 2-D or 3-D finite element analysis. Numerical examples show that the closed-form solution is in excellent agreement with finite element results, thus, validating both the accuracy and effectiveness of the transformation and closed-form solution.
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elastic stiffness properties and behavior of truss core Sandwich Panel
Journal of Structural Engineering-asce, 2000Co-Authors: Qianhua ChengAbstract:Sandwich construction provides a structural form that can be used for aviation, aerospace, marine, and mechanical/civil engineering applications. This paper introduces a truss-core Sandwich Panel and presents its elastic properties. Two thin flat sheets, separated by two inclined plates acting as the core and rigidly jointed at their ends, characterize the Sandwich section. This construction form eliminates most of the attendant problems of conventional spot-welded or rivet-fastened Sandwich Panel construction. Advantages of the truss-core Panel are discussed. The three-dimensional (3D) Sandwich Panel is idealized as an equivalent 2D orthotropic thick plate continuum. Equivalent bending, twisting, and transverse shear stiffness are derived, and the influence of the relatively weak shear stiffness on the behavior is discussed. By integrating these elastic stiffness constants into closed-form solution, Panel response is calculated. The calculated results, which require significantly less computational effort, agree well with 3D finite-element analysis. Comparisons of stiffnesses and deflections with the corresponding responses of conventional Sandwich construction are provided. This study indicates that the truss-core Sandwich Panel performs better because of its inherently higher flexural resistance per unit weight.
M. S. Hoo Fatt - One of the best experts on this subject based on the ideXlab platform.
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a wave propagation model for the high velocity impact response of a composite Sandwich Panel
International Journal of Impact Engineering, 2010Co-Authors: M. S. Hoo Fatt, Dushyanth SirivoluAbstract:A solution methodology to predict the residual velocity of a hemispherical-nose cylindrical projectile impacting a composite Sandwich Panel at high velocity is presented. The term high velocity impact is used to describe impact scenarios where the projectile perforates the Panel and exits with a residual velocity. The solution is derived from a wave propagation model involving deformation and failure of facesheets, through-thickness propagation of shock waves in the core, and through-thickness core shear failure. Equations of motion for the projectile and effective masses of the facesheets and core as the shock waves travel through Sandwich Panel are derived using Lagrangian mechanics. The analytical approach is mechanistic involving no detail account of progressive damage due to delamination and debonding but changes in the load-bearing resistance of the Sandwich Panel due to failure and complete loss of resistance from the facesheets and core during projectile penetration. The predicted transient deflection and velocity of the projectile and Sandwich Panel compared fairly well with results from finite element analysis. Analytical predictions of the projectile residual velocities were also found to be in good agreement with experimental data.
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a wave propagation model for the high velocity impact response of a composite Sandwich Panel
International Journal of Impact Engineering, 2010Co-Authors: M. S. Hoo Fatt, Dushyanth SirivoluAbstract:A solution methodology to predict the residual velocity of a hemispherical-nose cylindrical projectile impacting a composite Sandwich Panel at high velocity is presented. The term high velocity impact is used to describe impact scenarios where the projectile perforates the Panel and exits with a residual velocity. The solution is derived from a wave propagation model involving deformation and failure of facesheets, through-thickness propagation of shock waves in the core, and through-thickness core shear failure. Equations of motion for the projectile and effective masses of the facesheets and core as the shock waves travel through Sandwich Panel are derived using Lagrangian mechanics. The analytical approach is mechanistic involving no detail account of progressive damage due to delamination and debonding but changes in the load-bearing resistance of the Sandwich Panel due to failure and complete loss of resistance from the facesheets and core during projectile penetration. The predicted transient deflection and velocity of the projectile and Sandwich Panel compared fairly well with results from finite element analysis. Analytical predictions of the projectile residual velocities were also found to be in good agreement with experimental data.
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High Velocity Impact of a Composite Sandwich Panel
Sustainability, 2008Co-Authors: M. S. Hoo Fatt, Dushyanth SirivoluAbstract:This paper presents analytical solutions for the deformation response of a composite Sandwich Panel subjected to high velocity impact by a rigid blunt, cylindrical projectile. The solution is derived from a 2-degrees-of-freedom model for the Sandwich Panel involving local indentation, core crushing, and global bending/shear deformations. An example is given for a composite Sandwich Panel consisting of orthotropic E-glass vinyl ester facesheets and PVC H100 foam core and subjecting to the high velocity impact of a blunt cylindrical projectile. The analytical solution for the local indentation and global deflection under the projectile was found to be within 15% of finite element analysis results.
