不同含水率红陶土的SHPB动力学性能实验
Experimental on SHPB Dynamic Properties of Red Clay with Different Water Content
解北京 1武博文 1刘天乐 1栾铮 1张景顺 1于瑞星1
作者信息
- 1. 中国矿业大学(北京)应急管理与安全工程学院,北京 100089
- 折叠
摘要
为研究动态加载下红陶土的动态力学特性,利用分离式霍普金森压杆系统,开展了含水率分别为5％、7％、9％、11％、13％和15％,冲击速度分别为6、8、10 m/s,分析了不同含水率和应变率条件下红陶土的动力学特性.结果表明:随着冲击速度的增大,红陶土应变率效应显著;在冲击荷载作用下,红陶土的动态应力-应变关系曲线随加载应变率提高呈现2种曲线类型,分别为脆-塑性破坏和脆性破坏,随着应变率的增加,红陶土破坏过程由塑-脆性破坏逐转变为脆性破坏;红陶土的抗压强度、动态弹性模量均随应变率的增大而增加,并随着含水率的增大先减小后增大.
Abstract
In order to investigate the dynamic mechanical properties of red clay under dynamic loading,the split Hopkinson pres-sure bar(SHPB)dynamic test system was utilized to conduct tests at water content levels of 5％,7％,9％,11％,13％,and 15％,and impact velocities of 6 m/s,8 m/s,and 10 m/s.A total of 18 sets of red clay samples with varying water content and impact veloc-ity were examined to assess the dynamic characteristics of red clay under different water content and strain rate conditions.The findings indicate that the clay exhibits a noticeable strain rate dependency as the impact velocity increases.When subjected to impact loading,the dynamic stress-strain curve of lattice-clay displays two distinct curves corresponding to different loading strain rates,specifically brittle-plastic failure and brittle failure.As the strain rate rises,the failure mechanism of lattice-clay shifts gradually from plastic-brittle failure to brittle failure.Under the influence of impact velocity alone,the compressive strength and dynamic elastic modulus of terracot-ta increase with higher strain rates,while they initially decrease and then increase with rising water content.
关键词
红陶土/动态力学特性/冲击荷载/SHPB(split/Hopkinson/pressure/bar)Key words
red clay/dynamic mechanical properties/impact load/SHPB(split Hopkinson pressure bar)引用本文复制引用
基金项目
国家自然科学基金青年科学基金(51404277)
中央高校基本科研业务费专项(2022YJSAQ15)
出版年
2024
NETL
NSTL
万方数据