含椭圆分层缝纫复合材料层板的局部屈曲研究

桂良进; 叶宁; 郦正能; 寇长河

含椭圆分层缝纫复合材料层板的局部屈曲研究

北京航空航天大学飞行器设计与应用力学系

基金项目: 航空科学基金资助项目(96B51017)

详细信息

作者简介:
桂良进(1971-),男,江西星子人,博士生,100083,北京.

中图分类号: TB 33
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- 文章访问数: 3103
- HTML全文浏览量: 139
- PDF下载量: 260
- 被引次数: 0
出版历程
- 收稿日期: 1999-06-16
- 网络出版日期: 2000-06-30

Study on Local Buckling of Stitched Composite Laminates with an Elliptical Delamination

Beijing University of Aeronautics and Astronautics, Dept. of Flight Vehicle Design and Applied Mechanics

摘要

摘要: 建立了分析含椭圆分层的缝纫增强复合材料层板压缩屈曲问题的三维模型.通过应用瑞利-里兹法研究了分层椭圆几何参数和缝线等效弹性系数对压缩屈曲载荷的影响.分析结果表明,缝纫对提高临界曲屈载荷的作用十分明显,随着缝线等效弹性系数的增大,临界曲屈载荷迅速提高;分层椭圆的长轴垂直于载荷方向时,临界曲屈载荷最小,并且随长轴的长度增大时,临界曲屈载荷减小并逐渐收敛.
- 复合材料 /
- 层板 /
- 屈曲 /
- 缝纫
Abstract: Delamination buckling of stitched laminates can cause high interlaminar stresses which, in turn, lead to delamination growth. This study presents a three-dimensional model to analysis local buckling of stitched composite laminates with an embedded elliptic delamination near the surface. The effects of geometry parameters of ellipse and stitching thread on buckling loads are investigated by Rayleigh-Ritz energy method. The results show that stitching significantly improves critical buckling loads, the buckling loads increase rapidly with increase in equivalent elastic coefficient of stitching thread. The buckling loads are relatively large when the long axis of ellipse is vertical to the loading direction. With the increase in length of long axis, the buckling loads decrease and converge gradually.
- composite materials /
- laminates /
- buckling /
- stitching

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参考文献(1)

[1] Dransfield K, Baillie C, Mai Yiuwing. Improving the delmination resistance of CFRP by stitching- a review[J]. Composites Science and Technology,1994,50:305~317. [2]Sankar B V,Sharma S K. Effects of stitching on fracture toughness of uniweave textile graphite/epoxy laminates . NASA N96-17713,1996. [3]Shu Dongwei,Mai Yiuwing. Effect of stitching on interlaminar delamination extension in composite laminates[J]. Composites Science and Technology,1993,49:165~171. [4]Shu Dongwei, Mai Yiuwing. Delamination buckling with bridging[J]. Composites Science and Technology,1993,47:25~33. [5]Cox B N. Delamination and buckling in 3D composite[J]. Journal of Composite Materials, 1994,28(12):1114~1126. [6]Cox B N. Fundamental concept in the suppression of delamination buckling by stitching . NASA N95-28486,1995. [7]Shivkumer K N, Whitcomb J D. Buckling of a sublaminate in a quasi-isotrpic composite laminate[J]. Journal of Composite Materials, 1985,19:2~18.

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