In-plane effective elastic properties of a novel cellular core for sandwich structures

Abstract Within this paper an analytical model is presented for the calculation of the in-plane effective elastic properties E x and E y of a novel cellular structure which is proposed to be used as a core in sandwich structures. The proposed cellular core may represent a less expensive and easily to produce alternative to the already known cellular structures used for the construction of sandwich structures. The developed analytical model is validated through experimental tests. The results obtained by analyzing the theoretical model show a good agreement with the tests. The structure topology is studied using a parameterized unit cell and it is shown the way in which the in-plane stiffness depends on the geometric parameters and relative density of the core.

[1]  Fabrizio Scarpa,et al.  A novel centresymmetric honeycomb composite structure , 2005 .

[2]  M. Ashby,et al.  Cellular solids: Structure & properties , 1988 .

[3]  L. Gibson The elastic and plastic behaviour of cellular materials , 1981 .

[4]  S. Goswami On the Prediction of Effective Material Properties of Cellular Hexagonal Honeycomb Core , 2006 .

[5]  H. Wadley Multifunctional periodic cellular metals , 2006, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[6]  M. Ashby,et al.  Effective properties of the octet-truss lattice material , 2001 .

[7]  Haydn N. G. Wadley,et al.  On the performance of truss panels with Kagomé cores , 2003 .

[8]  Matthew J. Silva,et al.  The effects of non-periodic microstructure on the elastic properties of two-dimensional cellular solids , 1995 .

[9]  M. Ashby,et al.  The mechanics of three-dimensional cellular materials , 1982, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[10]  D. Zenkert,et al.  Handbook of Sandwich Construction , 1997 .

[11]  J. N. Reddy,et al.  Energy principles and variational methods in applied mechanics , 2002 .

[12]  Anthony M. Waas,et al.  Compressive response of circular cell polycarbonate honeycombs under inplane biaxial static and dynamic loading—Part II: simulations , 2002 .

[13]  J. Whitcomb,et al.  Effect of Sandwich Configuration on Behavior of Honeycomb Core , 2008 .

[14]  Anthony M. Waas,et al.  The inplane elastic properties of circular cell and elliptical cell honeycombs , 2000 .