碳纤维增强点阵夹芯结构的屈曲强度

张磊; 邱志平

碳纤维增强点阵夹芯结构的屈曲强度

张磊,
邱志平

北京航空航天大学航空科学与工程学院,北京 100191

基金项目: 国家自然科学基金重大研究计划(90816024);高等学校学科创新引智计划(B07009)

计量
- 文章访问数: 1581
- HTML浏览量: 84
- PDF量: 1481
- 被引次数: 0
出版历程
- 收稿日期: 2012-03-21
- 刊出日期: 2013-03-28

Buckling of lattice truss cores sandwich structures with carbon fiber reinforced

School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 考虑到点阵芯层的结构形式及杆单元以拉压为主的变形模式,基于连续介质等效理论,提出了一种全新的位移场假设,并以此编写了计算点阵夹芯复合材料屈曲强度的有限元程序.通过与不同试样的压缩试验的比较,对碳纤维增强点阵夹芯结构的屈曲行为进行了分析,并且验证了程序的有效性.同时,采用程序,讨论了点阵参数(包括杆单元长度、半径及倾斜角)对点阵夹芯复合材料结构屈曲强度的影响规律.结果表明:芯层体积分数相同的情况下,金字塔型和四面体型点阵夹芯结构的屈曲强度相差不大,后者略高.所得结论对点阵夹芯复合材料结构设计具有一定的指导意义.
- 碳纤维增强 /
- 点阵夹芯结构 /
- 屈曲强度分析 /
- 位移场假设 /
- 有限单元法
Abstract: Considering the geometrical configuration of the structure and the deformation mode of the lattice truss,a new displacement field assumption was proposed based on the equivalent continuum theory,and finite element method program was prepared for buckling analysis of lattice truss-core composites.By comparing with the compression test of a group of samples,the buckling behavior of sandwich structures with carbon fiber reinforced lattice truss cores was studied,and the validity was affirmed.Furthermore,the relationship between the buckling load of lattice truss-core composites and lattice parameters (including length,radius and angle of lattice truss) was discussed.The results demonstrate that the little difference exists in bulking load between pyramidal and tetrahedral lattice truss sandwich structures when the volume fraction of the cores are the same, the latter is a little higher.The conclusions are meaningful for the design of lattice truss-core composites.
- carbon fiber reinforced /
- lattice truss cores sandwich structure /
- buckling analysis /
- displacement field assumption /
- finite element method

HTML

参考文献(15)

[1]	Deshpande V S,Fleck N A,Ashby M F.Effective properties of the octet-truss lattice material[J].Journal of the Mechanics and Physics of Solids,2001,49(8):1747-1769.
[2]	Wallach J C,Gibson L J.Mechanical behavior of a three-dimensional truss material[J].International Journal of Solids and Structures,2001,38(40/41):7181-7196.
[3]	范华林.碳纤维点阵复合材料制备及其性能研究[D].北京:清华大学,2006. FAN Hualin.Manufacturing and properties of lattice composite materials[D].Beijing:Tsinghua University,2006.(in Chinese)
[4]	王兵,吴林志,杜善义,等.碳纤维增强金字塔点阵夹芯结构的抗压缩性能[J].复合材料学报,2010,27(1):133-138. WANG Bing,WU Linzhi,DU Shanyi,et al.Compressive behavior of sandwich structures with carbonfiber reinforced pyramidal latticetruss cores[J].Acta Materiae Compositae Sinica,2010,27(1):133-138.(in Chinese)
[5]	Deshpande V S,Fleck N A.Collapse of truss core sandwich beams in 3-point bending[J].International Journal of Solids and Structures,2001,38(36/37):6275-6305.
[6]	Chen J Y,Huang Y,Ortiz M.Fracture analysis of cellular materials:a strain gradient model[J].Journal of the Mechanics and Physics of Solids,1998,46(5):789-828.
[7]	范华林,杨卫.轻质高强点阵材料及其力学性能研究进展[J].力学进展,2007,37(1):99-112. FAN Huatin,YANG Wei.Development of lattice materials with high specific stiffness and strength[J].Advance in Mechanics,2007,37(1):99-112.(in Chinese)
[8]	Zhou J,Shrotiriya P,Soboyejo W O.On the deformation of aluminum lattice block structures from struts to structures[J].Mechanics of Materials,2004,36(8):723-737.
[9]	Wang A J,McDowell D L.In-plane stiffness and yield strength of periodic metal honeycombs[J].ASME Journal of Engineering Materuals and Technology,2004,126(2):137-156.
[10]	Kooistra G W,Deshpande V S,Wadley H N G.Compressive behaviour of age hardenable tetrahedral lattice truss structures made from aluminium[J].Acta Materials,2004,52(14):4229-4237.
[11]	Mohr D.Mechanism-based multi-surface plasticity model for ideal truss lattice materials[J].International Journal of Solids and Structures,2005,42(11/12):3235-3260.
[12]	Li M,Wu L Z,Ma L,et al.Structural response of all-composite pyramidal truss core sandwich columns inn end compression[J].Composite Structures,2011,93(8):1964-1972.
[13]	Allen H G.Analysis and design of structural sandwich panels[M].Oxford:Pergamon Press,1969:15-21.
[14]	王勖成,邵敏.有限单元法基本原理和数值方法[M].北京:清华大学出版社,1997.
[15]	Panda S,Nataraian R.Analysis of laminates composite shell structures by finite element method [J].Computers and Structures,1981,14(3/4):225-230.