﻿ 一种用于材料高应变率剪切性能测试的新型加载技术
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 力学学报  2016, Vol. 48 Issue (3): 654-659  DOI: 10.6052/0459-1879-15-445 0

### 引用本文 [复制中英文]

[复制中文]
Xu Zejian, Ding Xiaoyan, Zhang Weiqi, Huang Fenglei. A NEW LOADING TECHNIQUE FOR MEASURING SHEARING PROPERTIES OF MATERIALS UNDER HIGH STRAIN RATES[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(3): 654-659. DOI: 10.6052/0459-1879-15-445.
[复制英文]

### 文章历史

2015-12-11 收稿
2016-01-27 录用
2016-01-12 网络发表.

1 冲击剪切实验 1.1 试样设计

 图1 新型双剪切试样示意图 Fig.1 Schematic diagrams of the new double-shear specimen
1.2 试验方法

 $\left. {\matrix{ {{F_{{\rm{input}}}} = {A_{{\rm{bar}}}}{E_1}\left( {{\varepsilon _i}(t) + {\varepsilon _r}(t)} \right)} \hfill \cr {{F_{{\rm{output}}}} = {A_{{\rm{bar}}}}{E_2}{\varepsilon _t}(t)} \hfill \cr } } \right\}{\rm{ }}$ (1)
 $\left. \matrix{ {U_{{\rm{input}}}} = {C_1}\int_0^t {\left( {{\varepsilon _i}(t) - {\varepsilon _r}(t)} \right)} dt \hfill \cr {U_{{\rm{output}}}} = {C_2}\int_0^t {{\varepsilon _t}} (t)dt \hfill \cr} \right\}$ (2)

 $\left. \matrix{ \tau (t) = {{({F_{{\rm{input}}}} + {F_{{\rm{output}}}})/2} \over {2{A_{\rm{s}}}}} \hfill \cr \gamma (t) = {{{U_{{\rm{input}}}} - {U_{{\rm{output}}}}} \over L} \hfill \cr \dot \gamma (t) = {{\gamma (t)} \over {{t_0}}} \hfill \cr} \right\}$ (3)

 图2 典型实验波形图(L = 2 mm) Fig.2 Typical experimental signals(L = 2 mm)
1.3 试验结果及分析

 图3 不同剪应变率下的剪应力--剪应变曲线 Fig.3 Shear stress--shear strain curves at different shear strain rates
 图4 原始试样(上) 和回收试样(下) 对比 Fig.4 Original (up) and recovered (down) specimens
2 数值模拟及讨论

 图5 入射、反射和透射应变信号的实验和模拟结果比较 Fig.5 Comparison between the experimental and the simulated results of the incident, reflected and transmitted strain waves
 图6 试样两端在加载过程中的载荷曲线比较 Fig.6 Comparison between the forces of the loading and supporting ends of the specimen
 图7 剪切区内各应力分量的变化情况 Fig.7 Comparison of different stress components in the shear zone
 图8 两种应变率下实验与模拟结果的比较 Fig.8 Comparison between experimental and simulation results of tests under two strain rates
3 结论