Vibration and lateral buckling optimisation of thin-walled laminated composite channel-section beams

Abstract

Citation: Nguyen, Hoang, Lee, Jaehong, Vo, Thuc and Lanc, Domagoj (2016) Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) AbstractThis study presents vibration and lateral buckling optimisation of thin-walled laminated composite beams with channel sections. While flanges' width, web's height, and fibre orientation are simultaneously treated as design variables, the objective function involves maximising the fundamental frequency and critical buckling moment. Based on the classical beam theory, the beam element with seven degrees of freedom at each node is developed to solve the problem. Micro Genetic Algorithm (micro-GA) is then employed as an optimisation tool to obtain optimal results. A number of composite channel-section beams with different types of boundary conditions, span-to-height ratios, and lay-up schemes are investigated for the optimum design. The outcomes reveal that geometric parameters severely govern the optimal solution rather than the fibre orientation and it is considerably effective to use micro-GA compared with regular GA in term of optimal solution and convergence rate.

Review on Local Buckling of Hollow Box FRP Profiles in Civil Structural Applications

“…The effect of the wall slenderness was studied extensively for laminated plate geometry subjected to uniaxial compressive load [ 133 , 143 , 146 , 152 ] and the effect of the layup properties on the buckling load capacity of slender plates was found to be negligible compared to their dimensions [ 137 , 144 , 153 ]. This finding agrees with the results of parametric studies on open-section PFRP columns [ 67 , 81 , 114 ], shown in Figure 8 . When the slenderness ratio is reduced (thicker walls), the effect of the layup properties becomes significant.…”

“… The percentage of each research methodology used to study local buckling and its parameters (FEM: finite element method [ 29 , 54 , 55 , 57 , 58 , 66 , 68 , 69 , 71 , 73 , 81 , 88 , 91 , 93 , 94 , 95 , 99 , 106 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , …”

Vibration and buckling behaviours of thin-walled composite and functionally graded sandwich I-beams

“…The most well-known advantages of these materials are high stiffness-to-weight and strength-to-weight ratios, low thermal expansion, enhanced fatigue life and good corrosive resistance. In addition to their extensive use in practice, the available literatures indicate that a large number of studies have been conducted to analyse behaviours of these materials [1][2][3] in which thin-walled composite and functionally graded (FG) sandwich structures have been considered ( [4][5][6][7][8][9][10][11]). One of the first thin-walled beam theories have been presented by Vlasov [12] and Gjelsvik [13].…”

Buckling behaviour of thin-walled laminated composite beams having open and closed sections subjected to axial and end moment loading

“…To address this problem previous research available in open literature has proposed to develop alternative modelling techniques, preferably based on 1D FE beam elements, which leads to more efficient and affordable techniques for modelling [e.g. [1][2][3][4][5][6][7][8][9]. However, a real and significant challenge in developing such reduced order 1D FE models is the inclusion of all relevant physical coupling effects in the condensed (1D) formulation for thin-walled composite beams.…”