Multi-objective and multi-loading optimization of ultralightweight truss materials

A multi-parameter optimization procedure for ultralightweight truss-core sandwich panels is presented in this paper. To satisfy high design requirements, the proposed approach incorporates objectives from various structural performances of the material system at many loading cases simultaneously. To determine an optimal topology of the truss-core panel, the procedure combines standard finite element (FE) analysis with structural system profile analysis and multi-factor optimization techniques. Detailed configuration and sizing for both facesheets and individual struts in the sandwich panel are optimized. Two examples are presented: (i) tetragonal core panel, and (ii) plagihedral pyramidal core panel. The optimization improves the structural performance of each panel under multiple loading cases and minimizes its structural mass simultaneously.

[1]  N. Fleck,et al.  Collapse of truss core sandwich beams in 3-point bending , 2001 .

[2]  Graham Thompson,et al.  The Multi-Factor Design Evaluation of Antenna Structures by Parameter Profile Analysis , 1996 .

[3]  Stefanie Chiras,et al.  The structural performance of near-optimized truss core panels , 2002 .

[4]  T. J Lu,et al.  Design of a high authority flexural actuator using an electro-strictive polymer , 2002 .

[5]  L. Hollaway,et al.  Integrated structure-electromagnetic optimization of large reflector antenna systems , 1998 .

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

[7]  M. Ashby,et al.  The topological design of multifunctional cellular metals , 2001 .

[8]  Tian Jian Lu,et al.  Optimal design of a flexural actuator , 2001 .

[9]  L. C. Hollaway,et al.  Design optimisation of composite panel structures with stiffening ribs under multiple loading cases , 2000 .

[10]  H. Wadley,et al.  Multifunctional microtruss laminates: Textile synthesis and properties , 2001 .

[11]  Lorna J. Gibson,et al.  Mechanical behavior of a three-dimensional truss material , 2001 .

[12]  S. Torquato,et al.  Simulated Properties of Kagomé and Tetragonal Truss Core Panels , 2003 .

[13]  Douglas T. Queheillalt,et al.  The effects of topology upon fluid-flow and heat-transfer within cellular copper structures , 2004 .

[14]  John W. Hutchinson,et al.  Optimal truss plates , 2001 .

[15]  Howard P. Hodson,et al.  Convective heat dissipation with lattice-frame materials , 2004 .