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Micro-mechanical analysis of the in situ effect in polymer composite laminates

机译：聚合物复合材料层压板原位效应的微力学分析

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摘要

A micro-mechanical finite element model of a composite sublaminate is proposed to study the mechanical response of ultra-thin plies, consisting of a representative volume element of a 90° thin lamina in-between two homogenised ±θ° plies. Random fibre distributions, materially and statistically equivalent to real distributions, are analysed. A three-dimensional computational micro-mechanics framework, with a special focus on the elastic-plastic and damage constitutive behaviours of the matrix and on the response of the fibre-matrix interface, is used in the present analysis. Varying the 90° ply thickness, it is possible to assess its effect on the mechanical response of laminated composites - the in situ effect. The proposed framework is able to accurately represent the micro-mechanical response of ultra-low grades, including (ⅰ) the mechanics of transverse cracking onset and propagation, (ⅱ) the constraining effect observed in the laminae embedded in multidirectional laminates, (ⅲ) the gradual, slow stress relaxation and progressive transverse cracking observed in very thin plies, and consequent increase of the crack density, (ⅳ) the reduction in crack-opening displacement of the transverse cracks with ply thinness, (ⅴ) the formation of thin necks of matrix material around the regions where interfacial damage is more pronounced, and (ⅵ) the in situ strengths.
机译：为了研究超薄层的力学响应，提出了一种复合材料层合板的微机械有限元模型，该模型由两个均化的±θ°层之间的90°薄层的代表性体积单元组成。分析实质上和统计上等同于实际分布的随机纤维分布。在本分析中，使用了三维计算的微力学框架，特别关注基体的弹塑性和损伤本构行为以及纤维-基体界面的响应。改变90°的层厚度，可以评估其对层压复合材料机械响应的影响-原位影响。所提出的框架能够准确地表示超低品位的微观力学响应，包括（ⅰ）横向裂纹的发生和扩展机理，（ⅱ）嵌入多向层压板的薄板中观察到的约束效应，（ⅲ）在非常薄的帘布层中观察到逐渐的，缓慢的应力松弛和进行性的横向开裂，从而导致裂纹密度的增加；（with）随着帘布层的厚度减小了横向裂纹的开裂位移；（ⅴ）形成了细颈界面损伤更明显的区域周围的基体材料，以及（ⅵ）原位强度。

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  • 来源
    《Composite Structures》 |2014年第sepaaocta期|827-840|共14页
  • 作者

    A. Arteiro; G. Catalanotti; A.R. Melro; P. Linde; P.P. Camanho;

  • 作者单位

    DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Roberto Frias, s, 4200-465 Porto, Portugal;

    DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Roberto Frias, s, 4200-465 Porto, Portugal;

    INEGI, Universidade do Porto, Rua Roberto Frias, 400, 4200-465 Porto, Portugal;

    AIRBUS Operations GmbH, Kreetslag 10, 21129 Hamburg, Germany;

    DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Roberto Frias, s, 4200-465 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

    Laminates; In situ effect; Micro-mechanics; FEA;

    机译：层压板原位效应;微观力学;有限元分析;

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