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首页> 外文期刊>Journal of engineering materials and technology >Nanoclay and Microballoons WallThickness Effect on DynamicProperties of Syntactic Foam
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Nanoclay and Microballoons WallThickness Effect on DynamicProperties of Syntactic Foam

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The effect of nanoclay on the high strain rate mechanical properties of syntactic foams isstudied. Two types of microballoons with different wall thicknesses are used in fabricationof plain and nanoclay syntactic foams. Plain syntactic foams are fabricated with 60volume fraction of glass microballoons. 1, 2, and 5 volume fractions of Nanomer1.30E nanoclay are incorporated to produce nanoclay syntactic foams. High strain ratetest using split Hopkinson pressure bar (SHPB) apparatus is performed on all types ofplain and nanoclay syntactic foams. Dynamic modulus, strength, and correspondingstrain are calculated using the SHPB data. Quasistatic test is also performed and resultsare compared with the dynamic SHPB results. The results demonstrate the importance ofnanoclay and microballoon wall thickness in determination of syntactic foam dynamicproperties. It is found that at a high strain rate, the strength and modulus of compositefoams having K46 microballoons increase due to addition of 1 volume fraction ofnanoclay. However, in composite foams having S22 microballoons, the increase instrength is not significant at a high strain rate. Further increase in nanoclay volumefraction to 2 and 5 reduces the strength and modulus of composite foams having S22microballoons. Difference in wall thickness of microballoons is found to affect thestrength, modulus, strain energy, and deformation of composite foams. Composite foamsfabricated with thicker walled microballoons (K46) show comparatively higher values ofstrength, modulus, and strain energy compared with thin walled (S22) microballoons.Scanning electron microscopy shows that crack propagation behavior is distinct at dif-ferent strain rates.

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