摘要
利用分离式霍普金森压杆(SHPB)研究了三维四向编织碳纤维环氧树脂复合材料在动态压缩载荷作用下的力学性能。在横向对复合材料进行了动态压缩实验,得到了应变率从900/s―1500/s下的应力-应变曲线,并且与准静态压缩下的结果进行了对比。分析比较了应变率对三维编织复合材料横向压缩强度和模量的影响。实验中根据SHPB理论假设,采用波形整形技术,使得试件在加载过程中处于应力平衡和均匀变形状态。实验结果表明:压缩强度和模量具有一定的应变率强化效应;与准静态结果相比,在高应变率下的复合材料的强度和模量有明显的增大,并表现出明显的脆性。还分析了应变率对复合材料破坏模式的影响。
The mechanical properties of the 3D four-directional braided composites were investigated by using split Hopkinson pressure bar （SHPB） in transverse direction. The stress-strain curves for the composites along transverse direction were obtained at strain rates ranging from 900/s to 1500/s, and compared with the quasi-static compression test results. The effect of strain rate on compressive strength and modulus was discussed. Based on the SHPB hypothesis as well as pulse shaping technique, the specimen was made in equivalent stress and constant strain rate over the course of experiment. The results show that the compressive strength and modulus are sensitive to strain rate. The dynamic strength and modulus of the composites exhibit considerable increase as compared with the quasi-static values. The effect of strain rate on the failure mode was also analyzed.
出处
《工程力学》
EI
CSCD
北大核心
2008年第9期209-213,223,共6页
Engineering Mechanics
关键词
编织复合材料
动态力学性能
分离式霍普金森压杆
高应变率
波形整形
braided composites
dynamic mechanical properties
split Hopkinson pressure bar
high strain rate
pulse shaping
