摘要
为了研究动态冲击后颗粒增强镁基复合材料的力学行为,采用分离式霍普金森压杆(SHPB)对试样进行不同速度下的动态冲击实验,采用纳米压痕技术测得冲击后材料在不同压入深度和不同应变率情况下弹性模量、硬度和载荷等随位移的变化趋势,并分析了冲击速度对材料硬度和加载曲线的影响。结果表明:动态冲击后颗粒增强镁基复合材料的弹性模量、硬度随位移增大趋于稳定;载荷随压头压入位移的增大而增大,与位移呈非线性关系,极限载荷随着应变率的增加而增大;应变率对接触刚度几乎没有影响。
In order to study the mechanical behavior of particle reinforced magnesium matrix composites after dynamic impact,the split Hopkinson compression bar(SHPB)was used to test the dynamic impact behavior of the samples at different velocities.The changes of elastic modulus,hardness and load with displacement under different indentation depth and different strain rate were measured by nano-indentation technique,and the influence of impact velocity on the hardness and loading curve of the material was analyzed.The results show that,the elastic modulus and hardness of particle reinforced magnesium matrix composites after dynamic impact tend to stabilize with the increase of displacement.The load increases with the increase of indentation displacement of the indenter and,the relationship between load and displacement is nonlinear.The limit load increases with the increase of strain rate.The strain rate has little effect on the contact stiffness.
作者
魏俊磊
燕政辉
陈维毅
WEI Junlei;YAN Zhenghui;CHEN Weiyi(Re seach Institution of Applied Mechanics and Biomedicine Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《热加工工艺》
北大核心
2020年第4期76-79,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(11572213).
