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Corrugated skin composite sandwich panels.

机译：波纹皮复合夹芯板。

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摘要

The effect of corrugating the skins of composite sandwich panels was investigated analytically, numerically and with physical tests. For panels under uniaxial in-plane loading, with thin skins and a relatively soft core, skin wrinkling tends to dominate as a failure mechanism. Such panels benefit significantly from skin corrugations, directed parallel to the loading, when compared with equal mass flat panels. Semi-circular corrugations proved to be highly preferable to sine-wave shaped corrugations due to localized buckling in the latter. Over forty fiberglass and foam core sandwich specimens with semi-circular corrugations were tested to failure, providing corroboration of the numerical and analytical results.;For panels having a more complicated loading, a procedure was developed for calculating homogenized orthotropic plate stiffnesses of a sandwich using a simple representative volume element of the sandwich geometry. With these effective stiffnesses, a corrugated panel could be Finite Element modeled using a simple mesh that does not include the detail of each corrugation. The effect on uniaxial and shear panel buckling was investigated, with improvements seen for certain combinations of corrugation geometry and material properties.;Both conventional (flat) and corrugated skin sandwich panels with the size 1.34 m x 1.59 m were subsequently designed and manufactured for a large hybrid ship hull specimen. This specimen had the geometric shape of an existing bridge girder for a magnetically levitated train, which was retrofitted and tested as a 1:8 scale model of a destroyer class ship. A three point bending fatigue testing fixture was developed, and the specimen was non-reversing fatigue tested for 325 thousand cycles. Cracks were found in the steel of the specimen when the cyclic load was raised above the design load, however no catastrophic damage occurred in the bonded joints or composite panels, despite the corrugated panels having 15% lighter weight than the conventional flat panels.;Based upon this work, a high-speed boat was designed which will serve as an instrumented, real-world test facility for the effects of hull-water impacts. The hull of this boat was given a hybrid steel/composite construction and was designed to be removable, so that future experimental hull configurations can be tested.
机译：通过分析，数值和物理测试研究了复合夹心板的瓦楞纸的效果。对于在单轴面内载荷下的面板，其表皮较薄且芯相对较软，其起皱趋于成为破坏机理的主导。当与等质量的平板相比时，这种面板显着受益于平行于负载定向的皮肤波纹。半圆形波纹由于正弦波纹在局部中的屈曲而被证明比正弦波形波纹更优选。测试了40多个具有半圆形波纹的玻璃纤维和泡沫芯夹心试样的破坏，从而提供了数值和分析结果的证实;对于载荷更复杂的面板，开发了一种程序来计算均质正交异性正交各向异性板的刚度，方法是使用三明治几何的简单的代表性体积元素。有了这些有效的刚度，可以使用不包含每个波纹细节的简单网格对波纹板进行有限元建模。研究了对单轴和剪力板屈曲的影响，并在波纹几何形状和材料性能的某些组合方面得到了改善。;随后，设计并制造了尺寸为1.34 mx 1.59 m的常规（扁平）和波纹蒙皮夹芯板混合型船体标本。该标本具有现有的磁悬浮火车桥梁的几何形状，该桥梁经过改装并作为驱逐舰级船的1：8比例模型进行了测试。开发了三点弯曲疲劳测试夹具，并对样品进行了32.5万次循环的不可逆疲劳测试。当循环载荷提高到设计载荷以上时，在试样的钢中发现了裂纹，但是，尽管波纹板的重量比常规平板轻了15％，但在粘结接缝或复合板上没有发生灾难性的损坏。在这项工作的基础上，设计了一种高速船，该船将作为一种仪器化的，真实世界的船体水冲击试验设备。该船的船体采用钢/复合材料混合结构，设计为可移动，因此可以测试未来的实验船体配置。

著录项

  • 作者

    Reany, Jack.;

  • 作者单位

    Lehigh University.;

  • 授予单位 Lehigh University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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