Compressive Characterization of Single Porous SiC Hollow Particles
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Silicon carbide hollow spheres are compression tested to understand their energy absorption characteristics. Two types of particles having tap densities of 440 kg/m3 and 790 kg/m3 (referred to as S1 and S2, respectively) were tested in the present study. The process used to fabricate the hollow spheres leads to porosity in the walls, which affects the mechanical properties of the hollow spheres. The porosity in the walls helps in obtaining mechanical bonding between the matrix material and the particle when such particles are used as fillers in composites. The single-particle compression test results show that the S1 and S2 particles had fracture energies of 0.38 × 10−3 J and 3.18 × 10−3 J, respectively. The modulus and fracture energy of the particles were found to increase with increasing diameter. However, the increasing trend shows variations because the wall thickness can vary as an independent parameter. Hollow particle fillers are used in polymer and metal matrices to develop porous composites called syntactic foams. The experimentally measured properties of these particles can be used in theoretical models to design syntactic foams with the desired set of properties for a given application.
KeywordsFracture Energy Hollow Sphere Radius Ratio Syntactic Foam Hollow Particle
The work is supported by the Office of Naval Research grant N00014-10-1-0988 with Dr. Yapa D.S. Rajapakse as the program manager and cooperative agreement contract W911NF-10-2-0084 with the U.S. Army Research Laboratory, Dr. Vincent Hammond program manager. The authors thank the MAE Department for providing facilities and support. Kevin Chen and Nahal Mustafa are thanked for help with experiment setup and image analysis.
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