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Semi-analytic model to evaluate non-regularized stresses causing unfolding failure in composites

机译：半解析模型，用于评估导致复合材料展开失败的非规则应力

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摘要

A novel semi-analytic model is developed to determine interlaminar stresses in laminates including highly curved parts, for obtaining a rapid, accurate and reliable design tool for evaluating the reserve factor of a certain aeronautic composite component prone to unfolding failure. The model assumes plane conditions and is based, firstly, in an approximation of the 2D displacement components by using a series of functional products of separate variables and, secondly, in the use of higher-order moments of the stress components, which allow an enriched beam model to be constructed. The solution is obtained as the sum of products of a set of known functions, written in terms of the eigenvalues and eigenvectors of the matrix governing the model, and a set of integration constants. These constants can be determined with the boundary conditions, in isolated parts, and the continuity conditions, in laminates containing parts with different curvatures. In comparison with an existing analytical method, the present model has the advantage of offering an extremely accurate solution at the zones in which the analytical method may yield errors of even a 100%. In comparison with a detailed finite elements model, the present model obtains a similar accuracy in much lower computational times. (C) 2017 Elsevier Ltd. All rights reserved.
机译：开发了一种新颖的半解析模型来确定层压板（包括高度弯曲的零件）中的层间应力，从而获得一种快速，准确和可靠的设计工具，以评估某些易于展开失败的航空复合材料部件的储备因子。该模型假设为平面条件，首先基于二维位移分量的近似值，方法是使用一系列独立变量的函数积，其次基于应力分量的高阶矩，从而可以要构建的梁模型。该解决方案是根据一组已知函数的乘积之和得出的，这些函数以控制模型的矩阵的特征值和特征向量以及一组积分常数的形式表示。这些常数可以通过边界条件（在孤立零件中）和连续性条件（在包含不同曲率的零件的层压板中）确定。与现有的分析方法相比，本模型的优点是在分析方法可能产生甚至100％的误差的区域提供极其精确的解决方案。与详细的有限元模型相比，本模型在更少的计算时间内获得了相似的精度。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Composite Structures》 |2017年第7期|77-91|共15页
  • 作者

    Gonzalez-Cantero J. M.; Graciani E.; Paris F.; Lopez-Romano B.;

  • 作者单位

    Univ Seville, Escuela Super Ingn, Camino Descubrimientos S-N, Seville 41092, Spain|FIDAMC, Fdn Res Dev & Applicat Composite Mat, Avda Rita Levi Moltancini 29, Getafe 28906, Spain;

    Univ Seville, Escuela Super Ingn, Camino Descubrimientos S-N, Seville 41092, Spain;

    Univ Seville, Escuela Super Ingn, Camino Descubrimientos S-N, Seville 41092, Spain;

    FIDAMC, Fdn Res Dev & Applicat Composite Mat, Avda Rita Levi Moltancini 29, Getafe 28906, Spain;

  • 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

    Composite laminates; Curved laminates; Edge-effects; Interlaminar stresses;

    机译：复合层压板;弯曲层压板;边缘效应;层间应力;

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