Entity

Time filter

Source Type


Zhang X.,Huazhong University of Science and Technology | Zhang X.,Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment | Zhang H.,Wuhan Textile University
International Journal of Impact Engineering | Year: 2014

Multi-cell columns are highly efficient energy absorbing components under axial compression. However, the experimental investigations and theoretical analyses for the deformation modes and mechanisms of them are quite few. In this paper, the axial crushing of circular multi-cell columns are studied experimentally, numerically and theoretically. Circular multi-cell columns with different sections are axially compressed quasi-statically and numerical analyses are carried out by nonlinear finite element code LS-DYNA to simulate the experiments. The deformation modes of the multi-cell columns are described and the energy absorption properties of them are compared with those of simple circular tube. Theoretical models based on the constituent element method are then proposed to predict the crush resistance of circular multi-cell specimens. The theoretical predictions are found to be in a good agreement with the experimental and numerical results. © 2013 Elsevier Ltd. All rights reserved. Source


Zhang X.,Huazhong University of Science and Technology | Zhang X.,Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment | Zhang H.,Wuhan Textile University
International Journal of Impact Engineering | Year: 2012

Honeycomb cellular structures and multi-cell prismatic columns are highly efficient and effective energy dissipating components and are widely used in the crashworthiness design of vehicles. Due to the complex features during large plastic deformation, only few special sections have been theoretical modeled for their energy absorption capacity under axial compression. In this paper, based on a simplified FE model, the energy absorption characteristics of angle elements with three panels are investigated by using the non-linear finite element code LS-DYNA. Theoretical models are proposed to predict the crush resistance of three-panel angle elements with different angles. Numerical results show that the proposed theoretical model can predict the energy absorption of these angle elements with good accuracy. © 2012 Elsevier Ltd. All rights reserved. Source


Zhang X.,Huazhong University of Science and Technology | Zhang X.,Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment | Zhang H.,Wuhan Textile University
Thin-Walled Structures | Year: 2013

Multi-cell metal columns were found to be much more efficient in energy absorption than single-cell columns under axial compression. However, the experimental investigations and theoretical analyses of them are relatively few. In this paper, the quasi-static axial compression tests are carried out for multi-cell columns with different sections. The significant advantage of multi-cell sections over single cell in energy absorption efficiency is investigated and validated. Numerical simulations are also conducted to simulate the compression tests and the numerical results show a very good agreement with experiment. Theoretial analyses based on constitutive element method are proposed to predict the crush resistance of multi-cell columns and the theoretical predictions compare very well with the experimental and numerical results. © 2013 Elsevier Ltd. Source


Zhang X.,Huazhong University of Science and Technology | Zhang X.,Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment | Zhang H.,Wuhan Textile University
International Journal of Impact Engineering | Year: 2013

The present work is aimed at finding the maximum energy absorption efficiency of plates in thin-walled structures under compression. In thin-walled structures, the plates are connected with different angles and by different edge connectivity. The influences of these two major factors on the crush resistance of structures are investigated numerically by nonlinear finite element code. Two extreme modes: uniform mode and opposite mode are defined for the angle elements with different edge connectivity. The energy absorption characteristics of these two modes are investigated and a theoretical model is established to predict the energy absorption capacity of elements deforming in uniform mode. Experimental tests of multi-cell columns are conducted to validate the numerical analyses and theoretical models for angle elements. The numerical simulations and theoretical predictions of the crush resistance of multi-cell columns show a very good agreement with the experimental results. © 2013 Elsevier Ltd. All rights reserved. Source


Zhang X.,Huazhong University of Science and Technology | Zhang X.,Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment | Zhang H.,Wuhan Textile University
International Journal of Impact Engineering | Year: 2015

Four-panel angle elements are frequently encountered in multi-cell sections. To predict the energy absorption of such sections under axial loading, theoretical models have to be established for possible collapse modes of these elements. In this paper, four-panel angle elements are classified into four types: corner element, K-shaped, X-shaped and tree-shaped element. The influence of geometric parameters and type of triggers on collapse modes and crush resistance of these elements was firstly investigated numerically by using LS-DYNA. Theoretical models were then established for most commonly developed collapse modes of each type of four-panel angle elements. Elements with different width, thickness and angles were analyzed to validate the proposed models and the theoretical predictions by these models showed good agreement with numerical results. In addition, axial crushing test of two multi-cell sections with K-shaped elements was carried out quasi-statically and the experimental results validated the good accuracy of the present numerical and theoretical models. © 2014 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations