摘要
通过Hopkinson压杆实验研究了干、湿桉木在较高应变率下的应力-应变曲线,力学性能及破坏机制,并同准静态压缩实验的结果进行了比较.冲击压缩载荷作用下,干、湿桉木的破坏形式明显不同:干桉木纤维发生屈曲、坍塌,表现出应变率效应;湿桉木纤维束在水的作用下,沿轴向相互分离、溃散,较干按木表现出更明显的应变率效应,应力应变曲线的平台段出现尖峰.
The dynamic stress-strain relations and the failure mechanism of dry and wet eucalyptus wood under compression at high strain rate have been investigated by split Hopkinson pressure bar （SHPB）, while the comparison with the quasi-static compressive results has been conducted. The results show that when compressed at high strain rate, fibers of the dry eucalyptus samples occur local bucking and collapse, while fibers of the saturated eucalyptus samples divide with each other and collapse along the axial direction. It is observecl that the dry wood shows more obyiously strain rafe-dependtnt with the presence of sharp peaks in platform stage of the stress-strain curve.
出处
《固体力学学报》
CAS
CSCD
北大核心
2008年第4期348-353,共6页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金(50474075)资助
