The Experts below are selected from a list of 3093 Experts worldwide ranked by ideXlab platform
Xiaojing Gong - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of the influence of Ply Orientation on DCB mode-I delamination behavior by using multidirectional fully isotropic carbon/epoxy laminates
Composite Structures, 2017Co-Authors: M.s. Bin Mohamed Rehan, J. Rousseau, S. De Fontaine, Xiaojing GongAbstract:The influence of Ply Orientation on the resistance to mode I delamination of multidirectional composite laminates can be assessed by Double Cantilever Beam (DCB) tests. However, one difficulty is to uncouple the global and local effects due to the stacking sequence, which is necessary for a conclusive analysis. In the present work six multidirectional DCB specimens were designed so as to obtain an uncoupled fully isotropic elastic behavior, with the same properties for the entire laminate and the two sub laminates separated by the pre-crack at mid-plane. These specimens have different Ply Orientations, but their elastic properties are exactly the same. Hence differences in mode I delamination behavior are only due to local fiber Orientation effects. Experimental results show that the measured toughness at the crack initiation decreases with both adjacent and sub-adjacent Ply angles. During the crack propagation, the plateau value of the R-curve increases with the Ply angle of adjacent plies.
Xu Han - One of the best experts on this subject based on the ideXlab platform.
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rate related study on the Ply Orientation of carbon fiber reinforced epoxy composite laminates
International Journal of Mechanical Sciences, 2020Co-Authors: Zheyi Zhang, Shujuan Hou, Yiqi Mao, Xu HanAbstract:Abstract In many practical situations, composite structures are often subjected to complex impact loadings ranging from low to high strain rates. Therefore, it is necessary to characterize the mechanical performance of composite materials at different strain rate. In this paper, carbon fiber-reinforced epoxy laminates with different stacking sequences and Ply Orientations under dynamic impact loadings were investigated by split Hopkinson pressure bar (SHPB) apparatus. Dynamic results were compared with quasi-static compression results. The experimental results show that the strength of specimens increased with the increase of strain rate. Specifically, the stacking sequence and Ply Orientation of composite laminates have great impacts on their strain rate sensitivities. Moreover, the failure modes of specimens under quasi-static and dynamic impact loadings were compared and analyzed from both macroscopic and microscopic scales. The fracture surface morphology show that the interface between fiber and matrix tends to be a ductile failure mode under higher strain rates. Finally, through optimization design, the balance point between strength and toughness of the composite laminate was investigated and suggested.
M.s. Bin Mohamed Rehan - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of the influence of Ply Orientation on DCB mode-I delamination behavior by using multidirectional fully isotropic carbon/epoxy laminates
Composite Structures, 2017Co-Authors: M.s. Bin Mohamed Rehan, J. Rousseau, S. De Fontaine, Xiaojing GongAbstract:The influence of Ply Orientation on the resistance to mode I delamination of multidirectional composite laminates can be assessed by Double Cantilever Beam (DCB) tests. However, one difficulty is to uncouple the global and local effects due to the stacking sequence, which is necessary for a conclusive analysis. In the present work six multidirectional DCB specimens were designed so as to obtain an uncoupled fully isotropic elastic behavior, with the same properties for the entire laminate and the two sub laminates separated by the pre-crack at mid-plane. These specimens have different Ply Orientations, but their elastic properties are exactly the same. Hence differences in mode I delamination behavior are only due to local fiber Orientation effects. Experimental results show that the measured toughness at the crack initiation decreases with both adjacent and sub-adjacent Ply angles. During the crack propagation, the plateau value of the R-curve increases with the Ply angle of adjacent plies.
Erik Lund - One of the best experts on this subject based on the ideXlab platform.
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discrete topology optimization of Ply Orientation for a carbon fiber reinforced plastic cfrp laminate vehicle door
Materials & Design, 2017Co-Authors: Chi Wu, Jianguang Fang, Erik LundAbstract:Abstract This study addresses the design of Ply Orientation for a CFRP vehicle door by implementing a Discrete Material Optimization (DMO) method in a general-purpose commercial finite element code (ABAQUS) and mathematical analysis tool (MATLAB). To accommodate multiple loading conditions, the weighted mean compliance of the CFRP vehicle door was taken as the objective function, subject to the constraints on the local displacements, primary natural frequency and manufacturability. The sensitivities of objective and constraints were calculated by using the strain vectors, which is a more general method than using element stiffness matrices and allows extracting local displacements from the commercial finite element code. A gradient-based algorithm was employed in the DMO approach to tackle the large-scale problem. In the discrete topology optimization, four material penalization schemes were attempted in this study. The proposed DMO approach was compared with the empirical design and the existing method in commercial software. The results demonstrated that the proposed method is able to produce a more competent solution than the empirical design and other optimization methods efficiently.
Garry Wells - One of the best experts on this subject based on the ideXlab platform.
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A numerical study of Ply Orientation on ballistic impact resistance of multi-Ply fabric panels
Composites Part B: Engineering, 2015Co-Authors: Ying Wang, Xiaogang Chen, Robert J. Young, Ian A. Kinloch, Garry WellsAbstract:This paper presents a detailed finite element (FE) analysis aiming to investigate numerically the impact deformation of multi-Ply fabric panels with angled plies. The purpose of the investigation described in this paper is to study numerically the way in which the multi-Ply panels deform and to identify the energy absorption in different panel constructions. The FE model was created using ABAQUS to simulate the transverse impact of a projectile onto various woven fabric panels. Influencing factors such as the impact velocity, panel construction and the number of plies are taken into account in the FE simulations. The numerical predictions show that the Orientation of plies significantly affects the energy-absorbing capacity of the multi-Ply fabric panels. The angled panels always increase the energy-absorbing capacity, compared with the aligned panel, by as much as 20%, depending on the number of plies in the panel. In addition, the stacking sequence of oriented plies also plays an important role in absorbing the energy. For the multi-Ply fabric panel with large numbers of plies, there is an optimised sequence of plies which can maximise the energy-absorbing capacity of the panel. An important aspect of the work is validation of the numerical technique. It is shown that the FE predictions are highly consistent with the experimental study [1].
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an experimental study of Ply Orientation on ballistic impact performance of multi Ply fabric panels
Textile Research Journal, 2014Co-Authors: Ying Wang, Xiaogang Chen, Robert J. Young, Ian A. Kinloch, Garry WellsAbstract:This paper presents a comprehensive experimental study of the effect of Ply Orientation on the ballistic performance of the multi-Ply fabric panels. The fabric panels used in the experiments were constructed by laying plies of plain-woven fabrics in a selection of Orientations. Particular attention was paid to the stacking sequence of fabrics with different laying angles. Ballistic impact tests were carried out on such angled fabric panels. The results showed significant improvement in energy-absorbing capacity of the angled multi-Ply panel over the conventional aligned panel where all fabric plies were laid in the same Orientation. The impact energy absorption by these angled fabric panels showed a 14 % increase over the aligned counterpart, depending on the number of the plies. Optimising the stacking sequence of the angled plies caused a 15% increase in impact energy absorption. For the panels with a large number of plies such as the eight-Ply panels, the effective panel construction can be determined according to the performance of the sub-level Ply group.