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本文研究了熔融石英颗粒复合材料的力学行为。结果表明,这种复合材料的弹性模量和断裂表面能与弥散于基体中的颗粒体积分数成正比,而断裂功随颗粒体积分数呈指数增加。认为颗粒与基体间弱界面的解聚是熔融石英颗粒复合材料韧化的原因。复合材料的弯曲强度与颗粒体积分数成反比,这是因为视为准裂纹的弱界面,其密度随颗粒体积分数而增加的缘故。抗热冲击损伤参数(R″″),随颗粒体积分数呈指数增加,颗粒体积分数越多,材料的抗热冲击性越好。
In this paper, the mechanical behavior of fused silica granular composites has been studied. The results show that the elastic modulus and fracture surface energy of the composites are proportional to the volume fraction of particles dispersed in the matrix, and the fracture work increases exponentially with the particle volume fraction. It is considered that the debonding of the weak interface between the particles and the matrix is responsible for the toughening of the fused silica particle composite. The flexural strength of the composite material is inversely proportional to the particle volume fraction due to the weak interface considered as a quasi-crack, with its density increasing with the particle volume fraction. The thermal shock damage parameter (R “”) increases exponentially with the volume fraction of the particles. The more the particle volume fraction is, the better the thermal shock resistance of the material.