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Three-dimensional modelling of interlaminar normal stresses in curved laminate components

机译：弯曲层压成分中跨越正常应力的三维建模

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This paper presents the interlaminar normal stress distribution across the width of L-shaped composite corn-ponents in bending, with special emphasis on the free edge effects and the induced loading due to boundary conditions. As L-shaped composite components are becoming more commonplace in engineering applications, it is of vital importance to understand their failure mechanisms and stress fields. An extensive literature review reveals that interlaminar delamination is the critical failure mode for curved composite components. Despite this, most literature only provides a two-dimensional analysis of the interlaminar stresses and the free edge effects and asymmetry due to induced torsion are not considered. This paper uses three-dimensional finite element modelling to address the following with respect to L-shaped laminate components in bending: (i) radial stress due to the presence of curvature, (ii) effect of lay-up on the free edge effect, (iii) determining how induced torsion affects the interlaminar normal stress distribution. The necessity of using a three-dimensional model to analyse the interlaminar normal stress across the width of a curved composite component is discussed. It was concluded that using a two-dimensional model could underpredict the interlaminar normal stresses by up to 37% for the lay-ups analysed in this research.
机译：本文介绍了弯曲的L形复合玉米宽度宽度的间隔正常应力分布，特别强调自由边缘效应和由于边界条件引起的诱导负载。随着L形复合组件在工程应用中变得越来越普遍，对于了解其故障机制和压力领域，它至关重要。广泛的文献综述表明，Interlaminar Detamination是弯曲复合组件的临界失效模式。尽管如此，大多数文献仅提供对Interlaminar应力的二维分析，并且不考虑引起扭转引起的自由边缘效应和不对称性。本文采用三维有限元模型来解决弯曲的L形层压组分的以下内容：（i）由于曲率存在而径向应力，（ii）施加对自由边缘效应的影响， （iii）确定诱导的扭转如何影响层间正常应力分布。讨论了使用三维模型来分析弯曲复合部件宽度横跨弯曲复合部件的横跨弯曲的正常应力的必要性。得出结论，使用二维模型可能在本研究中分析的放置率高达37％的间隔正常应力高达37％。

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