The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Laifei Cheng - One of the best experts on this subject based on the ideXlab platform.

  • structural design and Energy Absorption Mechanism of laminated sic bn ceramics
    Journal of The European Ceramic Society, 2018
    Co-Authors: Mingxing Li, Laifei Cheng
    Abstract:

    Abstract The laminated silicon carbide/boron nitride (SiC/BN) ceramics with different structural designs were fabricated by pressureless sintering at 1900 °C for 1 h in argon flow. The alumina (Al2O3)-and yttrium(III) oxide (Y2O3)-doped SiC ceramic exhibited a significant intergranular fracture behavior, which could be attributed to the yttrium aluminum garnet (YAG) phase located at the grains boundaries. The bending strength and fracture toughness were used to characterize the crack propagation including the delamination cracking, crack kinking, and crack deflection. The Energy Absorption in the process of crack propagation was characterized by the work of fracture (WOF) and damping capacity. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN layer. The delamination cracks occurred inside the BN layer or at the interface between SiC and BN layers. The sample with a gradient structure exhibited the combination of delamination cracks occurring at the interface and inside the BN layer, which showed the maximum WOF of 2.43 KJ m−2, bending strength of 300 MPa, and fracture toughness of 8.5 MPa m1/2. The damping capacity varied with the change of the structure and the amplitude. The sample with a gradient structure exhibited the damping capacity of 0.088 and the maximum loss modulus of 9.758 GPa.

  • Structural design and Energy Absorption Mechanism of laminated SiC/BN ceramics
    Journal of The European Ceramic Society, 2018
    Co-Authors: Mingxing Li, Laifei Cheng
    Abstract:

    Abstract The laminated silicon carbide/boron nitride (SiC/BN) ceramics with different structural designs were fabricated by pressureless sintering at 1900 °C for 1 h in argon flow. The alumina (Al2O3)-and yttrium(III) oxide (Y2O3)-doped SiC ceramic exhibited a significant intergranular fracture behavior, which could be attributed to the yttrium aluminum garnet (YAG) phase located at the grains boundaries. The bending strength and fracture toughness were used to characterize the crack propagation including the delamination cracking, crack kinking, and crack deflection. The Energy Absorption in the process of crack propagation was characterized by the work of fracture (WOF) and damping capacity. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN layer. The delamination cracks occurred inside the BN layer or at the interface between SiC and BN layers. The sample with a gradient structure exhibited the combination of delamination cracks occurring at the interface and inside the BN layer, which showed the maximum WOF of 2.43 KJ m−2, bending strength of 300 MPa, and fracture toughness of 8.5 MPa m1/2. The damping capacity varied with the change of the structure and the amplitude. The sample with a gradient structure exhibited the damping capacity of 0.088 and the maximum loss modulus of 9.758 GPa.

Mingxing Li - One of the best experts on this subject based on the ideXlab platform.

  • structural design and Energy Absorption Mechanism of laminated sic bn ceramics
    Journal of The European Ceramic Society, 2018
    Co-Authors: Mingxing Li, Laifei Cheng
    Abstract:

    Abstract The laminated silicon carbide/boron nitride (SiC/BN) ceramics with different structural designs were fabricated by pressureless sintering at 1900 °C for 1 h in argon flow. The alumina (Al2O3)-and yttrium(III) oxide (Y2O3)-doped SiC ceramic exhibited a significant intergranular fracture behavior, which could be attributed to the yttrium aluminum garnet (YAG) phase located at the grains boundaries. The bending strength and fracture toughness were used to characterize the crack propagation including the delamination cracking, crack kinking, and crack deflection. The Energy Absorption in the process of crack propagation was characterized by the work of fracture (WOF) and damping capacity. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN layer. The delamination cracks occurred inside the BN layer or at the interface between SiC and BN layers. The sample with a gradient structure exhibited the combination of delamination cracks occurring at the interface and inside the BN layer, which showed the maximum WOF of 2.43 KJ m−2, bending strength of 300 MPa, and fracture toughness of 8.5 MPa m1/2. The damping capacity varied with the change of the structure and the amplitude. The sample with a gradient structure exhibited the damping capacity of 0.088 and the maximum loss modulus of 9.758 GPa.

  • Structural design and Energy Absorption Mechanism of laminated SiC/BN ceramics
    Journal of The European Ceramic Society, 2018
    Co-Authors: Mingxing Li, Laifei Cheng
    Abstract:

    Abstract The laminated silicon carbide/boron nitride (SiC/BN) ceramics with different structural designs were fabricated by pressureless sintering at 1900 °C for 1 h in argon flow. The alumina (Al2O3)-and yttrium(III) oxide (Y2O3)-doped SiC ceramic exhibited a significant intergranular fracture behavior, which could be attributed to the yttrium aluminum garnet (YAG) phase located at the grains boundaries. The bending strength and fracture toughness were used to characterize the crack propagation including the delamination cracking, crack kinking, and crack deflection. The Energy Absorption in the process of crack propagation was characterized by the work of fracture (WOF) and damping capacity. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN layer. The delamination cracks occurred inside the BN layer or at the interface between SiC and BN layers. The sample with a gradient structure exhibited the combination of delamination cracks occurring at the interface and inside the BN layer, which showed the maximum WOF of 2.43 KJ m−2, bending strength of 300 MPa, and fracture toughness of 8.5 MPa m1/2. The damping capacity varied with the change of the structure and the amplitude. The sample with a gradient structure exhibited the damping capacity of 0.088 and the maximum loss modulus of 9.758 GPa.

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

  • The Energy-absorbing capacity of grid-domed textile composites
    Composites Science and Technology, 2000
    Co-Authors: T.x. Yu, Xiao Ming Tao
    Abstract:

    This paper is concerned with the Energy-Absorption behaviour of cellular composites. Three grid-domed textile composites fabricated from knitted fabrics were studied under quasi-static compression and impact condition. In both cases, the Energy-absorbing capacity of the samples was measured. Comparison was made between the grid-domed composites, a composite comprising a non-woven fabric preform, polyester and polyethylene foams. The grid-domed composites exhibiting plastic collapses showed high levels of optimum specific Energy-absorbing capacity at higher pressure levels than those of polyester and polyethylene foams. In addition, increases in strain rate or relative density had a positive effect on the Energy-Absorption capacity. The major Energy-Absorption Mechanism of the grid-domed composite samples was identified as the plastic collapse of both the spherical cap and the truncated conical shell. Accordingly, a three-stage theoretical model is proposed; and the prediction of the Energy-absorbing capacity of these cellular textile composites is in good agreement with experimental results. (C) 2000 Elsevier Science Ltd. All rights reserved.

Jochen Weisse - One of the best experts on this subject based on the ideXlab platform.

  • Low velocity impact on CFRP plates with compressive preload: Test and modelling
    International Journal of Impact Engineering, 2020
    Co-Authors: Sebastian Heimbs, F. Hähnel, Simon Heller, Peter Middendorf, Jochen Weisse
    Abstract:

    International audienceWhen laminated composite materials in modern aircraft structures are subject to impact loads, they are typically not unloaded but under a certain state of prestress. Therefore, in this study the effect of a compressive preload on the low velocity impact behaviour of three different carbon fibre-reinforced plastic (CFRP) materials is investigated. An experimental test programme is documented first, including the design of a preload test device, the specimen manufacture and the results description. An increased deflection and Energy Absorption for composite plates with a preload of 80% of the buckling load could be observed. Non-destructive inspections showed a large extent of delaminations occurring between individual plies, being an important Energy Absorption Mechanism. The development of numerical simulation methods for this impact scenario using the commercial explicit finite element code LS-DYNA is described in detail. The focus is on the composite material, delamination and preload modelling. The final simulation results showed a good correlation to the experimental data in terms of force and Energy plots or the evaluated interlaminar and intralaminar damage, although these numerical results proved to be strongly influenced by simulation parameters like mesh size or the number of shell element layers

  • Low velocity impact on CFRP plates with compressive preload: Test and modelling
    International Journal of Impact Engineering, 2009
    Co-Authors: Sebastian Heimbs, F. Hähnel, Simon Heller, Peter Middendorf, Jochen Weisse
    Abstract:

    When laminated composite materials in modern aircraft structures are subject to impact loads, they are typically not unloaded but under a certain state of prestress. Therefore, in this study the effect of a compressive preload on the low velocity impact behaviour of three different carbon fibre-reinforced plastic (CFRP) materials is investigated. An experimental test programme is documented first, including the design of a preload test device, the specimen manufacture and the results description. An increased deflection and Energy Absorption for composite plates with a preload of 80% of the buckling load could be observed. Non-destructive inspections showed a large extent of delaminations occurring between individual plies, being an important Energy Absorption Mechanism. The development of numerical simulation methods for this impact scenario using the commercial explicit finite element code LS-DYNA is described in detail. The focus is on the composite material, delamination and preload modelling. The final simulation results showed a good correlation to the experimental data in terms of force and Energy plots or the evaluated interlaminar and intralaminar damage, although these numerical results proved to be strongly influenced by simulation parameters like mesh size or the number of shell element layers.

  • Low velocity impact on CFRP plates with compressive preload: Test and modelling
    International Journal of Impact Engineering, 2009
    Co-Authors: Sebastian Heimbs, F. Hähnel, Simon Heller, Peter Middendorf, Jochen Weisse
    Abstract:

    When laminated composite materials in modern aircraft structures are subject to impact loads, they are typically not unloaded but under a certain state of prestress. Therefore, in this study the effect of a compressive preload on the low velocity impact behaviour of three different carbon fibre-reinforced plastic (CFRP) materials is investigated. An experimental test programme is documented first, including the design of a preload test device, the specimen manufacture and the results description. An increased deflection and Energy Absorption for composite plates with a preload of 80% of the buckling load could be observed. Non-destructive inspections showed a large extent of delaminations occurring between individual plies, being an important Energy Absorption Mechanism. The development of numerical simulation methods for this impact scenario using the commercial explicit finite element code LS-DYNA is described in detail. The focus is on the composite material, delamination and preload modelling. The final simulation results showed a good correlation to the experimental data in terms of force and Energy plots or the evaluated interlaminar and intralaminar damage, although these numerical results proved to be strongly influenced by simulation parameters like mesh size or the number of shell element layers. © 2009 Elsevier Ltd. All rights reserved.

M Kazeminezhad - One of the best experts on this subject based on the ideXlab platform.

  • Energy Absorption Mechanism of al steel bilayer sheets produced by cold roll welding during wedge tearing
    International Journal of Mechanical Sciences, 2010
    Co-Authors: R Beygi, M Kazeminezhad
    Abstract:

    Abstract The behavior of Al–steel bilayer sheets produced by cold roll welding is investigated through the wedge tearing process. It is observed that through tearing the Energy absorbed by cold roll welded bilayer sheets is larger than that of non-welded ones, even though all parameters are identical. Also bilayer sheets with low bond strength have the same Energy absorbed by non-welded bilayer sheets. By investigating all contributing Mechanisms in tearing and mechanical properties of composite layers and developing theoretical equations, it is concluded that bending of sheets through wedge tearing plays a major role in difference of Energy absorbed by welded and non-welded bilayer sheets. Moreover, there is a good correlation between experimental data and theoretical equations developed for predicting the load–displacement curves of tearing and Energy Absorption of Al–steel bilayer sheets.