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A cohesive network approach for modelling fibre and matrix damage in composite laminates

机译：用于模拟复合材料层压板中纤维和基体损伤的内聚网络方法

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摘要

In the current study a high fidelity analysis approach is used to predict the failure process of notched composite structures. Discrete cracking is explicitly modelled by incorporating cohesive interface elements along potential failure paths. These elements form an interconnected network to account for the interaction between interlaminar and intralaminar failure modes. Finite element models of these configurations were created in the commercial analysis software ABAQUS and a user defined material subroutine (UMAT) was used to describe the behaviour of the cohesive elements. The material subroutine ensured that the model remained stable despite significant damage, which is a significant challenge for implicit damage simulations. Two analysis approaches were adopted using either the as-measured or modified (in-situ) ply strengths. Both approaches were capable of closely predicting the mean ultimate strength for a range of hole diameters. However, using the measured ply properties resulted in extensive matrix cracking in the surface ply which caused a deviation from the experimentally measured surface strain. The results demonstrate that high fidelity physically based modelling approaches have the ability to complement or replace certain experimental programs focussed on the design and certification of composite structures.
机译：在当前的研究中，高保真度分析方法用于预测带凹口的复合结构的破坏过程。通过沿潜在的失效路径合并粘性界面元素，可以对离散裂纹进行显式建模。这些元素形成一个互连的网络，以解释层间和层内故障模式之间的相互作用。这些构型的有限元模型是在商业分析软件ABAQUS中创建的，并且用户定义的材料子例程（UMAT）用于描述内聚元素的行为。物料子例程可确保模型在遭受重大损坏的情况下仍保持稳定，这对于隐式损坏模拟是一项重大挑战。两种分析方法都采用了已测得的或修改后的（原位）板层强度。两种方法都能够精确预测一系列孔直径的平均极限强度。然而，使用所测量的层片特性导致表面层片中的大量基体开裂，这导致与实验测量的表面应变产生偏差。结果表明，基于物理的高保真建模方法具有补充或替代某些专注于复合结构设计和认证的实验程序的能力。

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  • 来源
    《Composite Structures》 |2018年第12期|658-667|共10页
  • 作者

    Joosten M. W.; Yang Q. D.; Blacklock M.; Wang C. H.;

  • 作者单位

    Deakin Univ, Fac Sci Engn & Built Environm, Sch Engn, 75 Pigdons Rd, Waurn Ponds, Vic 3217, Australia;

    Univ Miami, Dept Mech & Aerosp Engn, Coral Gables, FL 33124 USA;

    Northumbria Univ, Dept Mech & Construct Engn, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England;

    Univ New South Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia;

  • 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; Strength prediction; Computational modelling; User subroutine (UMAT);

    机译：层压板;强度预测;计算建模;用户子例程（UMAT）;

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