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Hierarchical optimization of laminated fiber reinforced composites

机译：层压纤维增强复合材料的层次优化

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摘要

The aim of this work is to perform hierarchical optimization in laminated composite structures, considering simultaneously macroscopic and microscopic levels in the design of structure and material. The macroscopic level takes into account orientations and fiber volume fractions of unidirectional composite layers. The microscopic level considers the cross-sectional size and shape of the reinforcement fibers, assuming them elliptical. Both levels are coupled by a resource constraint and exchange derivatives in a mathematically consistent manner. The objective is to minimize compliance under a total fiber volume fraction constraint. The variation of the fibers' size and shape is considered by response surfaces for constitutive parameters of a reinforced lamina. Such surfaces are built from data evaluated by asymptotic homogenization techniques. The plies orientations are chosen using the Discrete Material Optimization (DM0) approach. Results in laminated plates show the influence of the reinforcement fibers' shape and volume fraction in their global behavior. The optimal microstructures obtained vary with the loading conditions considered. It is shown that the present optimization procedure permits to increase structural stiffness when material microstructural characteristics are considered. Moreover, an assessment of layers' microstruc-tural stresses is carried out in order to evaluate the fibers' shape influence on stress concentrations.
机译：这项工作的目的是在复合材料结构中执行分层优化，同时在结构和材料设计中同时考虑宏观和微观层面。宏观水平考虑了单向复合层的取向和纤维体积分数。微观层面考虑增强纤维的横截面尺寸和形状，假设它们是椭圆形的。这两个级别都受到资源约束的耦合，并且以数学上一致的方式交换导数。目的是在总纤维体积分数约束下使顺应性最小。通过响应表面来考虑纤维尺寸和形状的变化，以作为增强层板的本构参数。根据渐近均匀化技术评估的数据构建此类表面。使用离散材料优化（DM0）方法选择层的方向。层压板的结果表明增强纤维的形状和体积分数对其整体性能的影响。获得的最佳微观结构随所考虑的加载条件而变化。结果表明，当考虑材料的微观结构特征时，本优化程序可以增加结构刚度。此外，对层的微结构应力进行了评估，以评估纤维的形状对应力集中的影响。

著录项

  • 来源
    《Composite Structures》 |2014年第1期|246-259|共14页
  • 作者

    Rafael T.L. Ferreira; Helder C. Rodrigues; Jose M. Guedes; Jose A. Hernandes;

  • 作者单位

    IDMEC/IST, Instituto Superior Tecnico, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal,ITA, Institute Tecnologico de Aeronautica, Pca. Mal Eduardo Gomes, 50, 12228-900 Sao Jose dos Campos, SP, Brazil;

    IDMEC/IST, Instituto Superior Tecnico, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal;

    IDMEC/IST, Instituto Superior Tecnico, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal;

    ITA, Institute Tecnologico de Aeronautica, Pca. Mal Eduardo Gomes, 50, 12228-900 Sao Jose dos Campos, SP, Brazil;

  • 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
  • 关键词

    Hierarchical optimization; Laminated composites; Shape of reinforcement fibers;

    机译：分层优化;层压复合材料;增强纤维的形状;

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