%0 Journal Article
%T Experimental Investigation on Laminar Dynamic Compression Behavior of Quasi-3D Needle-Punched Cf/Sic Composite at Room Temperature<br>准三维针刺C_f/SiC复合材料室温层向动态压缩力学行为的实验研究
%A SUO Tao
%A SHI Chun-sen
%A LI Yu-long
%A DAI Lei
%A LIU Ming-shuang
%A <br>索涛
%A 石春森
%A 李玉龙
%A 戴磊
%A 刘明爽
%J 实验力学
%D 2012
%I 
%X To evaluate the influence of strain rate on laminar dynamic compression characteristics of quasi-3D needle-punched Cf/SiC composite, uni-axial compressive experiments were carried out at the strain rate ranging from 10-4 to 6.5×103s-1 at room temperature. Experimental results show that the dynamic compressive strength distribution obeys Weibull distribution due to the inevitable heterogeneous distribution of defects as gas-holes. Catastrophic brittle failure was not observed for the specimens tested at different strain rates. Instead, despite of the decrease of true stress with true strain after the stress reaches its compressive strength, the material still possesses a relatively high load-bearing capacity. It is also found that the compressive strength of the material increases obviously with the strain rate, and presents a linear relation with logarithm strain rate. Optical and scanning electron microscope (SEM) images of specimen's fracture surface indicate that the failure pattern of material varies with the strain rate applied. Under quasi-static loading, shear failure and delamination play important roles in the fracture process. However, split pattern is observed to feature the failure mode under high strain rate dynamic loading.
%K quasi-3D needle-punched Cf/SiC composite
%K Split Hopkinson pressure bar(SHPB)
%K dynamic compression
%K compressive strength<br>准三维针刺Cf/SiC复合材料
%K 分离式Hopkinson压杆
%K 动态压缩
%K 压缩强度
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=49067A0A0D864088C06A84AACB51A5B2&aid=EB1EEE94DAF205C62220ED45D2D4E51F&yid=99E9153A83D4CB11&vid=DB817633AA4F79B9&iid=CA4FD0336C81A37A&sid=42425781F0B1C26E&eid=1AE5323881A5ECDC&journal_id=1001-4888&journal_name=实验力学&referenced_num=0&reference_num=0