考虑屈曲强度的FGP梁孔隙率分布优化

IF 2.2 4区 工程技术 Q2 ENGINEERING, CIVIL Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI:10.12989/SEM.2021.79.6.711
M. Farrokh, Mohammad Taheripur
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引用次数: 2

摘要

本文采用遗传算法对功能梯度多孔(FGP)梁的孔隙率分布进行了优化,以实现归一化屈曲载荷与梁重的最大比值。利用基于欧拉和Timoshenko梁理论的虚功原理,解析确定了FGP梁在不同端部条件下的临界屈曲载荷解析形式。研究了纳米石墨烯薄片对纳米复合材料FGP梁临界屈曲载荷的影响。敏感性分析表明,在某些情况下,孔隙率会降低多孔梁的屈曲载荷重量比。根据优化结果,提出了几种孔隙度系数下孔隙度和NGPs体积分数的最佳分布。结果表明:孔隙率的最佳分布为对称的三明治状,而NGPs体积分数的最佳分布为均匀的。
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Optimization of porosity distribution of FGP beams considering buckling strength
In this paper, the porosity distribution of functionally graded porous (FGP) beams are optimized using the genetic algorithm to achieve the maximum ratio of the normalized buckling load to the beam's weight. The analytical forms for critical buckling loads of the FGP beams under different end conditions are determined analytically using principle virtual work based on the Euler and Timoshenko beam theories. The effects of Nano Graphene Platelets (NGPs) on the critical buckling load of the nanocomposite FGP beams are also taken into account. The sensitivity analyses show that porosity will reduce the buckling load-to-weight ratio of porous beams to conventional beams in some cases. Based on the optimization results, the optimum distribution of the porosity and NGPs' volume fraction are proposed for several porosity coefficients. The obtained results indicate that the optimum distribution for porosity has a symmetric sandwich-like shape while the optimum distribution for NGPs' volume fraction is uniform.
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来源期刊
Structural Engineering and Mechanics
Structural Engineering and Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
18.20%
发文量
0
审稿时长
11 months
期刊介绍: The STRUCTURAL ENGINEERING AND MECHANICS, An International Journal, aims at: providing a major publication channel for structural engineering, wider distribution at more affordable subscription rates; faster reviewing and publication for manuscripts submitted; and a broad scope for wider participation. The main subject of the Journal is structural engineering concerned with aspects of mechanics. Areas covered by the Journal include: - Structural Mechanics - Design of Civil, Building and Mechanical Structures - Structural Optimization and Controls - Structural Safety and Reliability - New Structural Materials and Applications - Effects of Wind, Earthquake and Wave Loadings on Structures - Fluid-Structure and Soil-Structure Interactions - AI Application and Expert Systems in Structural Engineering. Submission of papers from practicing engineers is particularly encouraged.
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