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Optimization of the microstructure of unidirectional hybrid composites under uniaxial tensile loads

机译：单轴拉伸载荷下单向混杂复合材料微观结构的优化

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摘要

Typical composite structures are characterized by having brittle failure and thus higher safety factors. Alternatively, hybrid composites with pseudo-ductile behaviour can contribute to safer and more efficient designs.The objective of this work is to achieve a "pseudo-ductile" behaviour in the response of unidirectional hybrid composites when subjected to uniaxial traction. To understand under what circumstances such behaviour is obtained, optimization problems are formulated and solved here.A Spring Element Model is used to predict the hybrid composite failure with relatively low computational cost. This cost is an important issue since optimization requires several analyses of the composite response. Two different types of optimization problems are considered. Firstly, one finds out the optimal properties of fibres to hybridize and get the pseudo-ductile behaviour. Once an optimal hybridization is found, another optimization problem is solved in order to understand the influence of the fibre dispersion on the composite response. Both optimization problems are solved using a Genetic Algorithm.The optimal results obtained show hybrid composites having a considerable pseudo-ductile behaviour. It is also shown that the degree of spatial fibre dispersion at the composite microstructure level greatly affects the composite response. High fibre dispersion favours the pseudo-ductile behaviour.
机译：典型的复合结构的特征在于具有脆性破坏并因此具有较高的安全系数。另外，具有伪延性行为的混合复合材料可以有助于更安全，更有效的设计。这项工作的目的是在单轴杂化复合材料受到单轴牵引时实现“伪延性”行为。为了了解在何种情况下会出现这种行为，在这里提出并解决了优化问题。使用弹簧元素模型以较低的计算成本来预测混合复合材料的失效。由于优化需要对复合响应进行多次分析，因此此成本是一个重要问题。考虑了两种不同类型的优化问题。首先，人们找到了最佳的纤维特性，使其能够杂交并获得假延性行为。一旦找到最佳杂交，就解决另一个优化问题，以便了解纤维分散对复合响应的影响。使用遗传算法解决了这两个优化问题。获得的最佳结果表明杂化复合材料具有相当大的假延性行为。还表明，在复合材料微观结构水平上空间纤维的分散程度极大地影响了复合材料的响应。较高的纤维色散有利于假延性。

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  • 来源
    《Composite Structures》 |2020年第3期|111795.1-111795.17|共17页
  • 作者

  • 作者单位

    NOVA Univ Lisbon UNIDEMI FCT P-2829516 Caparica Portugal|Univ Lisbon IDMEC IST Av Rovisco Pais 1 P-1049001 Lisbon Portugal;

    NOVA Univ Lisbon UNIDEMI FCT P-2829516 Caparica Portugal;

    Univ Porto INEGI FEUP Rua Dr Roberto Frias 400 P-4200465 Porto Portugal|Univ Girona Polytech Sch AMADE Campus Montilivi S-N Girona 17071 Spain;

    Univ Lisbon IDMEC IST Av Rovisco Pais 1 P-1049001 Lisbon Portugal;

    Univ Porto INEGI FEUP Rua Dr Roberto Frias 400 P-4200465 Porto Portugal;

  • 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

    Composites; Pseudo-ductility; Numerical modelling; Multi-objective; Layout; Optimization;

    机译：复合材料;假延展性数值建模;多目标;布局;优化;

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