
Chengxing YangCentral South University | CSU
Chengxing Yang
Doctor of Philosophy
Structures and materials for impact energy absorption.
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66
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Introduction
Welcome to submit an article to our collection, “Innovative Lattice Materials: Design, Manufacturing and Characterisation” for Frontiers in Mechanical Engineering.
(Link: https://www.frontiersin.org/research-topics/37029/innovative-lattice-materials-design-manufacturing-and-characterisation)
Deadlines: 10 June 2022 for Abstract; 12 August 2022 for Manuscript.
Editorial team: Dr. Chengxing Yang, Dr. Qiang Gao, Dr. Yongle Sun, Dr. Andrea Codolini
Publications
Publications (66)
This paper introduces a new hybrid friction energy-absorbing structures (HFEAS), which is consisting of a bearing bush, an anti-creeper device, a pretension bolt, a friction plate, and friction metal/CFRP tubes have been designed in the paper. The friction coefficient of raw material of CFRP was determined by the MM 3000 friction testing machine an...
The recognition and clustering of deformation modes are key to constructing impact deformation constraints for thin-walled structures. This paper transforms the clustering and recognition problem of structural impact deformation modes into a problem of clustering and recognition of point cloud sequences based on pseudo-labels. The effectiveness of...
Continuous fiber reinforced polymer composites are widely used in load-bearing components and energy absorbers owing to their high specific strength and high specific modulus. The path planning of continuous fiber is closely related to its structural defects and mechanical properties. In this work, continuous fiber reinforced polymer honeycomb stru...
One of the challenges in solving the structural crashworthiness optimisation problem under impact deformation constraints is to construct an efficient and concise representation method for structural impact deformation. This representation method is expected to include as much information about the structural impact deformation as possible and be c...
This paper presents a novel framework for predicting the crashworthiness of a square cone energy-absorbing (SCEA) structure using a machine-learning method. The structure consists of an anti-creep, a thin-walled structure with nonuniform thickness, diaphragms, two types of aluminum honeycombs and a guide rail. The finite element model of SCEA struc...
The energy absorption structure of a train is an important part of passive safety protection during train collisions and is the last line of defense to protect both passengers and trains. In the design process of a train energy absorption structure, improved stability and greater energy absorption capacity is required. A cutting anti-climbing energ...
The guardrail structure is generally installed in parallel on the inner side of the basic rail, which is expected to prevent the wheelsets of rail vehicles from derailing during the train-to-train collision test. This study aims to conduct research on the structural design and optimization of the guardrail for the train-to-train collision test plat...
High-speed train is a large-scale electromechanical coupling equipment with a complex structure, where the coupling is interlaced between various system components, and the excitation sources are complex and diverse. Therefore, reliability has become the top priority for the safe operation of high-speed trains. As the operating mileage of high-spee...
To improve the uncertainty of the deformation sequence of the energy-absorbing structures at the end of the subway vehicles during crushing, this paper adopts the gradient design idea of honeycomb structure size, collapse initiator groove and diaphragm. To this end, this paper proposes a honeycomb-filled gradient energy-absorbing structure (HGES) a...
Based on the hypothesis that multi-corner and multi-cell structures can effectively improve energy absorption behavior, this paper designed a multi-cell circumferentially corrugated tube (MCCT) for energy absorption. The MCCT was designed as a variable thickness form to study the influence of the materials distribution on the cross section on energ...
This study proposed a method to optimise the crashworthiness for the crush zone structure of a subway vehicle based on the beam element model. In the preliminary conceptual design, a simplified beam element model of the crush zone was established to verify the feasibility of the model. Then, a parameterised modelling method for the mechanical chara...
Artificial neural networks have drawn growing attention for their outstanding predictive capability combined with traditional research methods. This paper aims to propose a vehicle running attitude prediction model based on Artificial Neural Network-Parallel Connected (ANN-PL), predicting the longitudinal displacement (Svx) and vertical displacemen...
In order to study the influence of square-cone energy-absorbing structures on the mechanical behavior of the collision performance of the leading vehicle, a parameterization method for rapidly changing the performance of energy-absorbing structures was proposed. Firstly, a finite element simulation model of the collision of the leading vehicle with...
An auxiliary protection device (rail holding mechanism) was proposed to control the collision attitude of subway vehicles. The dynamics model of head-on collision of subway vehicles was established and verified by the full-scale collision test of the real car; then the force element structure of the rail holding mechanism was equated; finally, the...
The variation of working conditions makes the probability distribution of the source domain data and the target domain data differ greatly, which leads to the performance degradation of conventional fault diagnosis methods. Transfer learning is an effective tool to deal with this issue. However, existing methods still have shortcomings since they g...
This study aims to explore the projectile impact behaviour of curved glass fibre reinforced plastics (GFRP) composites for rail vehicles through experimental and numerical methods. Quasi-static material tests were firstly carried out to obtain the tensile, compression, shear and bending properties. Then, high-velocity impact tests under different v...
In order to study the influence of the square cone energy-absorbing structure of urban rail trains on the collision energy distribution of trains during the collision process, an eight-marshalling train crash dynamics model was established, and the force–displacement energy-absorbing characteristic curve of the anti-climbing structure was obtained...
A honeycomb-filled composite energy-absorbing structure (HCES) installed at the front end of a subway has an extensive range of application prospects in various crashworthy buffer structures due to its excellent energy-absorbing performance. Research to date on the crashworthiness optimization of energy-absorbing structure has mainly focused on a s...
Composite structures combine the advantages of multiple materials, which can improve the structural crashworthiness performance. This paper aims to combine the high strength of carbon fibre-reinforced plastic (CFRP), the excellent ductility of aluminium alloy (Al), and the good compressibility of polyurethane (PU) foam. Quasi-static compression and...
Improving the crashing performance of energy-absorbing structure is of vital significance for the safety of subways. To this end, a new type of honeycomb-filled thin-walled energy absorber with axisymmetric thickness (HTEA-AT) was proposed. Unlike the honeycomb-filled thin-walled energy absorber with uniform thickness (HTEA-UT), the thicknesses of...
Damage identification is a key problem in the field of structural health monitoring, which is of great significance to improve the reliability and safety of engineering structures. In the past, the structural strain damage identification method based on specific damage index needs the designer to have rich experience and background knowledge, and t...
Composite structures have drawn growing attention for their outstanding characteristics benefiting from the combination of multi materials. This paper aims to investigate the crushing performance of a hybrid system involving an outer thin-walled tube made of carbon fibre-reinforced plastic (CFRP), a medial polyurethane (PU) foam and an inner thin-w...
To improve the passive safety protection of crash energy management (CEM) passenger train, this paper presents the energy absorption design study for CEM passenger trains based on a 1/8th-scale model. By analysing the similarity of thin-walled structures for CEM trains, the similitude ratios of physical parameters were obtained and used to design t...
This article optimizes a multicellular thin-walled tube with N-equilateral triangles (MTTN), which was inspired from the microstructure of the cross-section of bamboo. The crashworthiness of MTTN under axial impact was analyzed, and the sensitivity analysis was conducted for the geometric parameters of MTT24, which exhibited the best crashing perfo...
When a train crashes with another train at a high speed, it will lead to significant financial losses and societal costs. Carrying out a train-to-train crash test is of great significance to reproducing the collision response and assessing the safety performance of trains. To ensure the testability and safety of the train collision test, it is nece...
This paper proposes a variable stiffness collision post (VSCP) structure based on a uniform stiffness collision post (USCP) structure and performs stiffness matching optimization for VSCPs. A collision post structure assembled in a subway front-end frame can maintain the living space and absorb a certain amount of the kinetic energy of an impact. T...
Shock and vibration caused by mechanical motion bring huge potential threats to the service life and assembly reliability of mechanical systems. Rubber materials have been widely used in aircraft, trains, and other engineering fields, due to their excellent properties in shock and vibration absorption. This paper aimed to study the rubber ring buff...
Many hierarchical structures have good mechanical properties, which can better improve the energy absorption characteristics and achieve lightweight. This article proposed a novel circumferential sinusoidal hierarchical tube (CSHT). Experiments and numerical simulation were used to analyze the energy absorption performance of CSHTs. There were four...
Shape memory alloy wires embedded glass fiber-reinforced polymer (SMA-GFRP) laminates have great potential in engineering applications. In this paper, low-velocity impact behaviors of SMA-GFRP laminates are investigated under different initial impact energies. Firstly, tensile tests are conducted on a single SMA wire and SMA-GFRP laminates to obtai...
Complex and small-scale architectures, e.g., topology-optimised materials and functionally graded lattice materials (FGLMs), can be well fabricated with the assistance of additive manufacturing (AM). This work investigates the compressive properties of a functionally graded cuttlebone-like lattice (CLL) material. Experimental compression tests are...
This study is aimed to compare and optimise the crashing performances of an axisymmetric rectangular tube (ART) and a uniform thickness tube (UTT) under offset loading. Both ART and UTT are strengthened with diaphragms. Numerical simulations for the initial UTT with diaphragms under offset loading were firstly performed based on the experimentally...
As ordered cellular materials, lattice materials are excellent lightweight candidates for impact energy/shock absorbing applications. This study aims to explore an advanced lattice material with objective of maximum energy absorption based on topology optimisation. Effects of cell-wall material and mass fraction on topological results are analysed....
To investigate the mechanical properties of combined structures of stacked multilayer Nomex® honeycombs, a finite element model of the combined structures of stacked honeycombs was established to simulate quasi-static compression. The results were compared with test data, thus verifying the accuracy of the simulation. On this basis, a series of sim...
This study proposes a method to apply dual criteria for the assessment of product damage based on the deceleration signal in a crash-stop incident. To evaluate the shock effects, a procedure is proposed to decompose the original crash signal into two components, i.e. an equivalent crash signal and a residual shock signal. The characteristics of cra...
A new composite structure was formed by filling Nomex honeycomb with polyester fibre to achieve the goal of improving its acoustic characteristics. By using the impedance tube method, the sound absorption coefficient (SAC) of porous materials was determined. Moreover, the effects of different specifications of honeycomb, porosities of fibre, and am...
This work comparatively studies the uniaxial compressive performances of three types of lattice materials, namely face-centre cube (FCC), edge-centre cube (ECC), and vertex cube (VC), which are separately generated by topology optimisation and crystal inspiration. High similarities are observed between the materials designed by these two methods. T...
This work studies the mechanical performances of four lattice materials, i.e., face-edge cube (FEC), edge-vertex cube (EVC), face-vertex cube (FVC) and face-edge-vertex cube (FEVC), guided by topology optimisation with maximum stiffness. The effects of cell topologies and relative densities on mechanical properties are numerically characterised and...
The collapse zone is a critical component of railway vehicle, which is designed with multiple functions, i.e., supporting neighbouring components and attached equipment in its normal operation and absorbing impact energy in a crash accident. However, there is a lack of systematic study on the design of the collapse zone based on the strategy of top...
The fabrication process of cellular materials, such as foaming, usually leads to cells elongated in one direction, but equiaxed in a plane normal to that direction. This study is aimed at understanding the elasto-plastic behaviour of transversely isotropic cellular materials with inner gas pressure. An idealised ellipsoidal-cell face-centred-cubic...
Crash signal is generally given by a deceleration-time (or a force-time) history measured in a crash stop. Occupant injury and damage of protected object are highly related to the parameters of the crash signal. This paper assesses deceleration-time histories in a crash stop from two aspects, i.e., (i) minimisation of head injury index; (ii) physic...
This study proposes a new axisymmetric rectangular tube (ART) with diaphragms. Unlike a uniform thickness tube (UTT), the thicknesses of adjacent ART walls are defined to be independent, with the thicknesses of the opposite walls remaining identical. The finite element model of ART with diaphragms was developed and validated by experiments; moreove...
To improve the crashworthiness of subway vehicles, a composite energy-absorbing structure (EAS) is designed by coupling a thin-walled metal tube and aluminium honeycomb structures. On this basis, the effectiveness of the composite structure and aluminium honeycomb finite element model (FEM) is validated by conducting trolley impact tests and quasi-...
This study proposes a new composite structure to promote energy absorption capability of railway vehicles by integrating characteristics of a thin-walled steel structure and aluminum honeycomb fillers. Non-linear explicit code LS_DYNA3D(971) was utilized in building detailed finite element models, which were also validated by previous test data. Co...
This study proposes the design strategy of a new collapse zone structure for railway vehicles and explores its crashing performance through numerical simulation and experiments. Starting from the one-dimensional (1D) collision analysis of two train sets, the force–displacement characteristics of each vehicle-end can be expressed in the form of a no...