摘要
利用分离式Hopkinson压杆(SHPB)实验装置,在-25和-10℃的低温下,对冰进行了应变率为500～2 000s-1的动态压缩实验。制作了试样的模具和低温制冷保温装置,满足冰所需要的低温条件。SHPB实验中使用波形整形器消除波形振荡现象,并最大程度地实现恒应变率加载。实验表明,冰的动态应力应变呈非线性关系;在较高应变率下,冰的动态应力应变关系与应变率相关,峰值应力和破坏应变都随应变率的增大而增大。温度对冰的强度有明显影响,冰的压缩强度随温度的升高而降低。
To explore the dynamic mechanical characteristics of ice,uniaxial compression tests were carried out in the strain rate range from 500 to 2 000 s-1 by using the split Hopkinson pressure bar(SHPB) technique at-25 and-10 ℃,respectively.Molds were designed to manufacture ice samples,and a cooling chamber was developed to meet the low-temperature condition.Pulse shapers were used to achieve constant strain rate loading.Experimental results show that the dynamic stress-strain relation of ice is nonlinear,the peak stress and failure strain increase with the increase of strain rates,and the compressive strength of ice decreases with the increase of the test temperature.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2011年第2期215-219,共5页
Explosion and Shock Waves
基金
国防基础预研项目(A2720060277)
高等学校学科创新引智计划项目(B07050)~~
关键词
爆炸力学
动态力学行为
SHPB
冰
solid mechanics
dynamic mechanical behavior
SHPB
ice
