Effect of Microballoon Radius Ratio on Syntactic Foam Core Sandwich Composites

Hollow particles, called microballoons, are commonly used in the fabrication of syntactic foams, which are used as core materials in sandwich composites. The present experimental investigation aims at characterizing five different types of syntactic foam core sandwich composites for their edgewise compressive strength. The microballoon volume fraction is maintained at 0.65 in each type of syntactic foams. The five types of microballoons used in the study have the same mean outer diameter of about 40 mm but different wall thickness causing a difference in their densities and strengths. The differences in the compressive strength and modulus of sandwich composites are related to the microballoon radius ratio, which is defined as the ratio of the internal to the external radii of the microballoons. It is observed that the compressive strength and modulus of syntactic foams increase with a decrease in the microballoon radius ratio. The specimen fracture features are also discussed.

[1]  S. Wong,et al.  Fracture and Impact Toughness of Syntactic Foam , 2004 .

[2]  P. Mensah,et al.  Compression properties of syntactic foams: effect of cenosphere radius ratio and specimen aspect ratio , 2003 .

[3]  Kishore,et al.  Compressive fracture features of syntactic foams-microscopic examination , 2002 .

[4]  N. Gupta,et al.  Response of Syntactic Foam Core Sandwich Structured Composites to Three-Point Bending , 2002 .

[5]  N. Gupta,et al.  Effect of radius ratio parameter of cenospheres on the compressive properties of syntactic foams , 2002 .

[6]  N. Gupta,et al.  Microscopic studies of syntactic foams tested under three-point bending conditions , 2002 .

[7]  Kishore,et al.  Studies on compressive failure features in syntactic foam material , 2001 .

[8]  Kishore,et al.  Processing and compressive strengths of syntactic foams with and without fibrous reinforcements , 2001 .

[9]  C. S. Karthikeyan,et al.  Effect of Absorption in Aqueous and Hygrothermal Media on the Compressive Properties of Glass Fiber Reinforced Syntactic Foam , 2001 .

[10]  Francesco Genna,et al.  Elastic design of syntactic foamed sandwiches obtained by filling of three-dimensional sandwich-fabric panels , 2001 .

[11]  N. Gupta,et al.  Stress concentration factor approach to analyze the deformation and fracture behavior of particulate composites , 2001 .

[12]  Mohammad Azhar Khamis.,et al.  Fracture and impact behaviours of hollow micro-sphere/epoxy resin composites , 2001 .

[13]  Alberto Corigliano,et al.  Mechanical behavior of a syntactic foam: experiments and modeling , 2000 .

[14]  Alberto Corigliano,et al.  Experimental characterization and numerical simulations of a syntactic foam/glass fibre composite sandwich , 2000 .

[15]  H. Kim,et al.  Manufacturing and impact behavior of syntactic foam , 2000 .

[16]  Thomas M Truskett,et al.  Is random close packing of spheres well defined? , 2000, Physical review letters.

[17]  R. Kaul,et al.  Sandwich Composite, Syntactic Foam Core Based, Application for Space Structures , 2000 .

[18]  J. d’Almeida.  An analysis of the effect of the diameters of glass microspheres on the mechanical behavior of glass-microsphere/epoxy-matrix composites , 1999 .

[19]  Kishore,et al.  Correlation of processing methodology to the physical and mechanical properties of syntactic foams with and without fibers , 1999 .

[20]  N. Gupta,et al.  On the Characterisation of Syntactic Foam Core Sandwich Composites for Compressive Properties , 1999 .

[21]  C. Hiel,et al.  Long-term hygrothermal effects on damage tolerance of hybrid composite sandwich panels , 1995 .