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LU Zixing~(1,*), SHI Shanglu~1, ZOU Bo~1, KOU Changhe~1, ZHANG Zilong~2, LI Hongyun~2(1. Institute of Solid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing 100083,China;2. Beijing Institute of Aeronautical Materials, Beijing 100095, China)  
The compressive mechanical properties of epoxy syntactic foam reinforced with hollow glass micro-spheres are studied by quasi-static compression tests. Some predicting formulae of Young's modulus and yield strength of syntactic foam are proposed based on the results of composite mechanics. In addition, the failure mechanism of syntactic foam is investigated by macroscopic and microscopic observation of fractured specimens. The results show that the deformation characteristics of syntactic foams are very similar to those of plain foams during compression. The syntactic foam is yielded when the strain reaches about 2% and it is collapsed when the strain is larger than 30%. Furthermore, the Young's modulus and yield strength of syntactic foam are decreased with the decrease of density of material, and the predicted results of formulae are basically in agreement with the experimental data. The macroscopic and microscopic observation of fractured specimens indicates that the main failure mode is elasto-plastic collapse caused by shear.
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