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Multiobjective material architecture optimization of pultruded FRP I-beams

机译：拉挤玻璃钢工字梁的多目标材料结构优化

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摘要

This paper presents the application of micro/macromechanics models and optimization techniques for the optimum design of pultruded glass fiberreinforced plastic composite I-beams with respect to material architecture: fiber orientations and fiber percentages. The beams are subjected to transverse loading, and beam deflection, buckling resistance and material failure are considered as multiple objectives (criteria) in the optimization process. Assuming a symmetrical laminated structure for the pultruded sections, experimentally verified micro/macromechanics models are used to predict ply properties, beam member response and ply strains and stresses. The Tsai-Hill failure criterion is used to determine first-ply-failure loads. Considering the coupling of lateral and distortional buckling, a stability Rayleigh-Ritz solution is used to evaluate the critical buckling loads for pultruded I-beams, and the results are verified with finite element analyses. A multiobjective design optimization formulation combined with a global approximation technique is proposed to optimize beam fiber architecture, which can greatly enhance the load carrying capacity of a section. The optimization procedure presented in this paper can serve as a practical tool to improve the performance of existing fiber-reinforced plastic without changing the current geometries.
机译：本文介绍了微观/宏观力学模型和优化技术在拉挤玻璃纤维增​​强塑料复合工字梁的材料结构方面的优化设计：纤维取向和纤维百分比。梁承受横向载荷，梁的挠度，屈曲阻力和材料破坏被认为是优化过程中的多个目标（标准）。假设拉挤截面为对称的层压结构，则使用经过实验验证的微观/宏观力学模型来预测层板特性，梁构件响应以及层板应变和应力。 Tsai-Hill破坏准则用于确定第一层破坏载荷。考虑到横向屈曲和变形屈曲的耦合，采用稳定的瑞利-里兹（Rayleigh-Ritz）解法评估拉挤工字梁的临界屈曲载荷，并通过有限元分析验证了结果。提出了一种结合全局逼近技术的多目标设计优化公式，以优化梁光纤架构，可以大大提高截面的承载能力。本文介绍的优化程序可以作为一种实用工具，在不改变当前几何形状的情况下提高现有纤维增强塑料的性能。

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  • 来源
    《Composite Structures》 |1996年第3期|p.271-281|共11页
  • 作者

    Julio F. Davalos; Pizhong Qiao; Ever J. Barbero;

  • 作者单位

    Department of Civil and Environmental Engineering, Constructed Facilities Center, West Virginia University, Morgantown, WV26506-6103, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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