玻璃微珠/环氧树脂复合材料的动静态力学性能研究

Study on dynamic and static mechanical properties of glass beads/epoxy resin composites

玻璃微珠浮力材料是一种由空心玻璃微珠(HGB)和环氧树脂制造的二相复合材料。玻璃微珠材料因其具有低密度、高强度、吸水率低等特点被广泛应用于建材、航海、航天等领域。其静态力学性能已经得到充分地研究,但对其动态力学性能的研究尚不能满足工程应用需求。采用INSTRON电子万能试验机和分离式霍普金森压杆(SHPB)对HGB/环氧树脂复合材料进行了准静态/动态加载情况下的压缩、劈拉、伪三轴压缩实验。结果表明,HGB/环氧树脂复合材料具有较强的应变率敏感性。其抗压强度、劈裂抗拉强度随应变率增加而增加,表现出应变率增强效应。其破坏形式也存在应变率敏感特性,随着应变率的提高其脆性增加。对比单轴压缩及伪三轴压缩,发现材料在伪三轴压缩情况下较单轴压缩时抗压强度增强。

Glass bead buoyancy material is a two-phase composite material made of hollow glass bead(HGB)and epoxy resin.Glass bead has been widely used in building materials,navigation,aerospace and other fields because of its low density,high strength and low water absorption.Its static mechanical properties have been fully studied,but its dynamic mechanical properties are less studied,which are not enough to meet the needs of engineering applications.The compression,splitting and pseudo-triaxial compression experiments of HGB/epoxy resin composites under quasi-static/dynamic loading were carried out by INSTRON electronic universal testing machine and split Hopkinson pressure bar(SHPB).The results show that HGB/epoxy composite has strong strain rate sensitivity.The compressive strength and splitting resistance increase with the increase of strain rate,showing strain rate enhancement effect.The failure mode is also rate sensitive,and its brittleness increases with the increase of strain rate.Comparing uniaxial compression with pseudo triaxial compression,it is found that the compressive strength of the material under pseudo triaxial compression is higher than that under uniaxial compression.