Fabrication and mechanical properties of composite pyramidal truss core sandwich panels with novel reinforced frames

The novel composite pyramidal truss core sandwich panels with reinforced joints are manufactured by the water jet cut and interlocking assembly method. Here, the relative density ρ ¯ of the carbon fiber composite pyramidal truss cores varies in the range 0.88–4.4%. The out-of-plane compression and shear performance of sandwich structures are investigated. Analytical estimates for sandwich panel strength are presented for possible competing failure modes. In general, the measured failure loads show good agreement with the analytical predictions. The measured quasi-static uniaxial compressive strength increases from 0.53 to 8.9 MPa with increasing ρ ¯ over the relative density range investigated here. The shear strength of lattice cores is improved by eliminating core-to-face sheet bond failures. The measured quasi-static shear strength varies between 0.78 and 1.75 MPa. Compared with node non-reinforced composite pyramidal truss sandwich panels, under the relative density of 1.8%, the shear strength of node reinforced sandwich panels increases by 120%, and its shear modulus increases by 26.5%.

[1]  Li Ma,et al.  Fabrication and crushing behavior of low density carbon fiber composite pyramidal truss structures , 2010 .

[2]  H. Wadley,et al.  Mechanical response of carbon fiber composite sandwich panels with pyramidal truss cores , 2013 .

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

[4]  Hualin Fan,et al.  Sandwich panels with Kagome lattice cores reinforced by carbon fibers , 2007 .

[5]  Li Ma,et al.  Mechanical behavior of the sandwich structures with carbon fiber-reinforced pyramidal lattice truss core , 2010 .

[6]  Vikram Deshpande,et al.  Fatigue performance of sandwich beams with a pyramidal core , 2007 .

[7]  K. Kang,et al.  A parametric study on compressive characteristics of Wire-woven bulk Kagome truss cores , 2010 .

[8]  K. Kang,et al.  Mechanical behavior of sandwich panels with tetrahedral and Kagome truss cores fabricated from wires , 2006 .

[9]  H. Wadley,et al.  The compressive response of carbon fiber composite pyramidal truss sandwich cores , 2007, International Journal of Materials Research.

[10]  H. Bart-Smith,et al.  Structural response of pyramidal core sandwich columns , 2007 .

[11]  Hualin Fan,et al.  Mechanical Behaviors and Bending Effects of Carbon Fiber Reinforced Lattice Materials , 2006 .

[12]  Li Ma,et al.  Pyramidal lattice sandwich structures with hollow composite trusses , 2011 .

[13]  J. Byun,et al.  The compressive response of new composite truss cores , 2012 .

[14]  Douglas T. Queheillalt,et al.  Shear behavior of aluminum lattice truss sandwich panel structures , 2008 .

[15]  Haydn N. G. Wadley,et al.  Titanium alloy lattice truss structures , 2009 .

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

[17]  Lin-zhi Wu,et al.  Mechanical response of all-composite pyramidal lattice truss core sandwich structures , 2011 .

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

[19]  M. Ashby,et al.  FOAM TOPOLOGY BENDING VERSUS STRETCHING DOMINATED ARCHITECTURES , 2001 .

[20]  A. Evans,et al.  Measurement and Simulation of the Performance of a Lightweight Metallic Sandwich Structure With a Tetrahedral Truss Core , 2004 .

[21]  M. Ashby,et al.  Designing hybrid materials , 2003 .

[22]  Hilary Bart-Smith,et al.  Imperfection sensitivity of pyramidal core sandwich structures , 2007 .

[23]  Douglas T. Queheillalt,et al.  Mechanical properties of an extruded pyramidal lattice truss sandwich structure , 2008 .

[24]  Tian Jian Lu,et al.  Novel strengthening methods for ultralightweight sandwich structures with periodic lattice cores , 2010 .

[25]  Linzhi Wu,et al.  Shear and bending performance of carbon fiber composite sandwich panels with pyramidal truss cores , 2012 .

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

[27]  J. Yang,et al.  Mechanical behavior of carbon fiber composite lattice core sandwich panels fabricated by laser cutting , 2012 .

[28]  Lin-zhi Wu,et al.  Mechanical behavior and failure of composite pyramidal truss core sandwich columns , 2011 .