Optimization of Elastically Tailored Tow-Placed Plates with Holes
Optimization of Elastically Tailored Tow-Placed Plates with Holes
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DOI：
10.2514/6.2003-1420
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
D. Jegley;Brian F. Tatting;Z. Guerdal
中科院分区：
文献类型：
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作者：
D. Jegley;Brian F. Tatting;Z. Guerdal
通过允许纤维在层压板平面内弯曲来定制层压复合材料板的弹性刚度是一种设计理念，已被证明是有益且实用的。本文的目的是证明通过使用曲线纤维来减少孔周围的应力集中并提高面板的承载能力的刚度定制的有效性。通过使用优化程序对轴向压缩下无孔平板进行设计研究，确定了要制造和测试的初步面板设计。然后使用准确反映测试条件和几何形状的有限元模型对这些候选设计进行分析，以便决定制造和测试的最终设计。使用先进的丝束铺放机来制造具有不同纤维取向角的测试板。总共制造了六块三英尺乘六英尺的大面板，每块面板用于生产四个带孔或不带孔的样本。这些面板被加工成带孔的样本，并在美国宇航局兰利研究中心进行测试。介绍了不带孔和具有两种不同孔尺寸的面板的屈曲响应和失效。牵引试件的屈曲和破坏载荷明显大于传统直纤维试件的屈曲和破坏载荷。
Elastic stiffness tailoring of laminated composite panels by allowing the fibers to curve within the plane of the laminate is a design concept that has been demonstrated to be both beneficial and practical. The objective of the present paper is to demonstrate the effectiveness of stiffness tailoring through the use of curvilinear fibers to reduce stress concentrations around the hole and improve the load carrying capability of panels. Preliminary panel designs that are to be manufactured and tested were determined through design studies for flat plates without holes under axial compression using an optimization program. These candidate designs were then analyzed with finite element models that accurately reflect the test conditions and geometries in order to decide upon the final designs for manufacture and testing. An advanced tow-placement machine is used to manufacture the test panels with varying fiber orientation angles. A total of six large panels measuring three feet by six feet, each of which is used to produce four specimens with or without holes, are fabricated. The panels were machined into specimens with holes and tested at NASA Langley Research Center. Buckling response and failure of panels without holes and with two different hole dimensions are presented. Buckling and failure loads of tow-steered specimens are significantly greater than the buckling and failure loads of traditional straight-fiber specimens.