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首页> 外文期刊>Composite Structures >Local fibre reinforcement of holes in composite multilayered plates
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Local fibre reinforcement of holes in composite multilayered plates

机译：复合多层板中孔的局部纤维增强

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摘要

For various technical reasons, cutouts such as holes in thin-walled structures are inevitable and are of significant technical relevance. Unfortunately holes lead to an undesired stress concentration at the hole vicinity and a reduced strength of the structure. Therefore in practice a local reinforcement in the form of a ring is usually applied around the hole. The increasing requirements for modern structures in terms of low weight and high strength lead to the question of an optimal reinforcement design. The present paper addresses the new but well-approved techniques of the use of curved fibre format to determine the aforementioned optimal design of the reinforcement. The optimization of cutouts in laminated composite plates under bi-axial tensile loading conditions has been investigated using two approaches: the finite element and the Rayleigh-Ritz method. The used methodology implemented successfully theoretical results based on the complex potential theory. For the considered problems, the proposed methods were shown to successfully produce a constant objective function around the hole boundary under biaxial loading. The optimal reinforcement of holes in laminated composite plates illustrated that the optimum depends on the degree of orthotropy. Significant reduction of stress concentrations were demonstrated. The results obtained illustrate the necessity and usefulness of the applied optimization procedure.
机译：由于各种技术原因，诸如薄壁结构中的孔之类的切口是不可避免的，并且具有重大的技术意义。不幸的是，孔导致不期望的应力集中在孔附近，并且降低了结构强度。因此，实际上，通常在孔周围施加环形式的局部加强件。在轻质和高强度方面对现代结构的日益增长的需求导致了最佳加固设计的问题。本文讨论了使用弯曲纤维形式确定上述增强材料的最佳设计的新技术，但得到了广泛认可。使用两种方法研究了在双轴拉伸载荷条件下层压复合板中切口的优化：有限元法和瑞利-里兹方法。所使用的方法论成功地实现了基于复杂势能理论的理论结果。对于所考虑的问题，所提出的方法显示出在双轴载荷下成功地在孔边界周围产生了恒定的目标函数。层压复合板中孔的最佳加固表明，最佳取决于正交各向异性的程度。结果表明，应力集中显着降低。获得的结果说明了应用优化程序的必要性和实用性。

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