Abstract:Recently, published research indicates that metal/composite hybrid structures, which combine the excellent specific strength and stiffness of composites with the competitive material cost and toughness of metals, have shown superior performance under axial and oblique loadings. Nevertheless, the crushing behaviors under lateral loading are still rarely reported. In this paper, lateral quasi-static planar crushing tests were carried out to investigate the mechanical response and crushing behaviors for aluminum/… Show more
“…A similar observation was obtained by Guohua et al. 26 in the case of hybrid metal/CFRP tubular elements examined under lateral crush force. Figure 3.Typical progressive crushing profiles during lateral compression.…”
Section: Resultssupporting
confidence: 86%
“…Furthermore, the increase in number of the basalt fabric plies seemed to have less effect on the crushing modes of the proposed hybrid tubes. A similar observation was obtained by Guohua et al 26 in the case of hybrid metal/CFRP tubular elements examined under lateral crush force.…”
Section: Lateral Crushing Behavior Of Aluminum-basalt Fabric Reinforced Nanocomposite Tubesupporting
Thin-walled tubular configurations with hybridization concept have been gained special consideration in recent years owing to their substantial balance between light-weight characteristics and crashworthiness performance. In this context, some research studies have been concentrated on the feasibility of a thin-walled metal-composite hybrid tube. It is also eminent that the impact energy absorption capability of such hybrid tubes can further be enhanced through modification of the epoxy matrix by adding nanofillers. In this research article, aluminum-based multiwalled carbon nanotubes reinforced epoxy composite cylindrical tubes are introduced, and their corresponding quasi-static crushing behavior, subjected to lateral loading is examined experimentally. The influence of the number of fabric plies (2, 3, and 4) and type of fabric (basalt, glass) of the composite part on the crashworthiness characteristics was evaluated. The overall outcomes revealed that the proposed hybrid tube samples showed outstanding energy absorption characteristics, comprising a stable crush force–deformation response and better specific energy absorption. It is also noted that the deformation behavior and energy absorption capability of the aluminum tubes could be considerably improved by applying a nanocomposite-wrapped plies.
“…A similar observation was obtained by Guohua et al. 26 in the case of hybrid metal/CFRP tubular elements examined under lateral crush force. Figure 3.Typical progressive crushing profiles during lateral compression.…”
Section: Resultssupporting
confidence: 86%
“…Furthermore, the increase in number of the basalt fabric plies seemed to have less effect on the crushing modes of the proposed hybrid tubes. A similar observation was obtained by Guohua et al 26 in the case of hybrid metal/CFRP tubular elements examined under lateral crush force.…”
Section: Lateral Crushing Behavior Of Aluminum-basalt Fabric Reinforced Nanocomposite Tubesupporting
Thin-walled tubular configurations with hybridization concept have been gained special consideration in recent years owing to their substantial balance between light-weight characteristics and crashworthiness performance. In this context, some research studies have been concentrated on the feasibility of a thin-walled metal-composite hybrid tube. It is also eminent that the impact energy absorption capability of such hybrid tubes can further be enhanced through modification of the epoxy matrix by adding nanofillers. In this research article, aluminum-based multiwalled carbon nanotubes reinforced epoxy composite cylindrical tubes are introduced, and their corresponding quasi-static crushing behavior, subjected to lateral loading is examined experimentally. The influence of the number of fabric plies (2, 3, and 4) and type of fabric (basalt, glass) of the composite part on the crashworthiness characteristics was evaluated. The overall outcomes revealed that the proposed hybrid tube samples showed outstanding energy absorption characteristics, comprising a stable crush force–deformation response and better specific energy absorption. It is also noted that the deformation behavior and energy absorption capability of the aluminum tubes could be considerably improved by applying a nanocomposite-wrapped plies.
“…In order to analyze the stress distribution of the plow bit in the cutting process, the geometric model of the plow bit is imported into ANSYS software for mesh generation, and Solid 164 element is adopted for meshing of plow bit [33], [34]. Due to the irregularity of plow bit, Mesh 200 element is applied to mesh the surface, and the intelligent mesh generation method is used for the rest parts.…”
Coal plow is one of the important equipment for thin seam mining, it is very important to improve the performance of plow for efficient coal mining. In order to study the cutting performance of the coal plow, the cutting test is carried out in National Energy Mining Equipment Research Center, and the forces of the plow bit with different cutting speeds and depths are obtained. According to the properties of simulated coal wall, the intrinsic parameters of coal wall material are determined, and the three-dimensional bond contact model of coal wall is established by EDEM software. The force information of coal plow, the distribution of coal particles and the residual state of the coal wall surface are obtained through the numerical simulation. The results show that the maximum error of the force obtained by DEM simulation and experiment is 7.849 %, and the error of the width the residual coal ridge is 6.5 %. The force distribution of the plow bit is analyzed by combining the discrete element method with the finite element method. The high dynamic stress area of the plow bit is mainly concentrated in the back of the body and the alloy head inlay position. In order to reduce the consumption of the plow bit, local heat treatment is carried out on the plow bit, which can improve the mechanical properties of the plow bit. The simulation results are verified by experiments and industrial production, which proves the accuracy and feasibility of using DEM to study the cutting performance of coal plow.
“…With the application of the decomposition procedure to a certain amount of eigen matrices χ (k) , a set of λ (k) can be derived to determine a set of cross-section deformation modes. They are further organized into a matrix as = λ (1) , λ (2)…”
Section: Assemblage Of Basis Functionsmentioning
confidence: 99%
“…Thin-walled structures are widely used as structural components in various fields of engineering mainly because of their advantage of high strength to weight ratio [1], [2]. The analysis of thin-walled structures through one-dimensional models represents a simple and efficient method that has been successfully adopted.…”
This paper presents a novel procedure to identify cross-section deformation modes of thin-walled structures with the application of pattern recognition. Initially, a higher order model is derived by considering an approximation of cross-section deformation by a set of basis functions, which are integrated in the governing equations and decoupled through the solution of the associated generalized eigenvalue problem. The eigenvectors obtained are deemed to inherit the attributes of structural behaviors, and thus can serve as the basis to identify deformation modes. Accordingly, these eigenvectors are further handled employing the singular value decomposition, in order to recognize the axial variation patterns of the basis functions. Next, each eigenvector is orthogonally decomposed into components corresponding to the variation patterns, with their proportional relationship, which is really pursued, being obtained and used as the weights to ''assemble'' basis functions to generate deformation modes. Moreover, a numbering system is proposed to hierarchically organize these deformation modes. Finally, a reduced higher order model can be obtained by updating the initial governing equations with a selective set of cross-section deformation modes. The main features lie in the capability to be numerically implemented in a simple and intuitive way and the nature to give identified deformation modes mechanical interpretation inherited from actual dynamic behaviors of thin-walled structures. The versatility of the procedure as well as the resulting beam model has been validated through both numerical examples and comparisons with other theories. INDEX TERMS Thin-walled structures, cross-section deformation modes, pattern recognition, a higher order beam theory.
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