SHPB加载下PTFE/Al冲击反应的临界条件

乌布力艾散·麦麦提图尔荪; 葛超; 田超; 董永香

doi:10.11883/bzycj-2017-0075

SHPB加载下PTFE/Al冲击反应的临界条件

doi: 10.11883/bzycj-2017-0075

北京理工大学爆炸科学与技术国家重点实验室, 北京 100081

基金项目:

国家自然科学基金项目 11202028

国家自然科学基金项目 11472053

详细信息

作者简介:
乌布力艾散·麦麦提图尔荪(1991-), 男, 硕士研究生

通讯作者:
董永香, dongyongx@bit.edu.cn

中图分类号: O383.3;TJ04
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- 被引次数: 0
出版历程
- 收稿日期: 2017-03-14
- 修回日期: 2017-07-12
- 刊出日期: 2018-09-25

Impact-induced initiation criteria of PTFE/Al by split Hopkinson pressure bar

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 采用分离式霍普金森压杆（SHPB）加载方法和高速摄影技术，对混合压制烧结法制备的铝颗粒增强聚四氟乙烯复合材料（polytetrafluoroethylene/Al，PTFE/Al）的冲击反应临界条件进行研究。实验中采用钢杆、铝杆和不同尺寸的试样，进行不同加载条件下的测试，实验结果表明：PTFE/Al复合材料的冲击反应过程主要可分为变形、碎裂、反应阶段，其冲击反应临界同时关联于应力和应变率。并基于实验获得了PTFE/Al复合材料的冲击反应临界渐进线应力和应变率，通过对实验数据的归纳和分析，初步提出实验条件下关联应力和应变率的PTFE/Al临界反应关系式，获得冲击反应阈值预测曲线。
- PTFE/Al /
- 分离式霍普金森压杆 /
- 冲击反应 /
- 临界条件
Abstract: Impact-induced initiation criteria of Al particles reinforced PTFE (PTFE/Al) prepared by compression/sintering were studied by split Hopkinson pressure bar (SHPB) and high speed photography in this work. SHPB systems comprising of either steel or aluminum bars were applied to test PTFE/Al samples of different dimensions, in order to study the effect of the impact stress and the loading strain rate on the impact-induced initiation behaviors of PTFE/Al. It shows that the impact-induced initiation process of PTFE/Al mainly includes the deformation, fragmentation and reaction, which is simultaneously related to the impact stress and the loading strain rate. Based on the experimental results, the criteria of impact stress and loading strain rate for the impact-induced initiation of PTFE/Al have been obtained. Moreover, an analytical expression of impact-induced initiation criteria including impact stress and loading strain rate was established and a theoretical curve was predicted for the impact-induced initiation events of PTFE/Al under SHPB tests.
- PTFE/Al /
- split Hopkinson pressure bar /
- impact-induced reaction /
- reaction criteria

HTML全文

图 1 SHPB冲击加载实验装置示意图

Figure 1. Schematic of SHPB impact loading setup

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图 2 PTFE/Al真实应力应变曲线

Figure 2. True stress-strain curves of PTFE/Al

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图 3 SHPB加载下试样动态响应过程

Figure 3. Dynamic response of the sample under SHPB impact

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图 4 SHPB测试部分示意图

Figure 4. Testing section of SHPB

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图 5 钢杆测试系统冲击下的实验波形

Figure 5. Experimental waveforms under the impact of a steel bar test system

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图 6 PTFE/Al试样在钢杆冲击加载下的动态响应过程

Figure 6. Dynamic response process of PTFE/Al sample under impact loading by steel bar

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图 7 PTFE/Al试样在铝杆冲击加载下的动态响应过程

Figure 7. Dynamic response process of PTFE/Al sample under impact loading by aluminum bar

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图 8 PTFE/Al试样在钢杆冲击加载下的动态响应过程

Figure 8. Dynamic response process of PTFE/Al sample under impact loading by steel bar

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图 9 冲击应力和应变率关系

Figure 9. Relation between impact stress and strain rate

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图 10 压缩过程中PTFE/Al细观结构应力分布

Figure 10. Stress distribution of PTFE/Al under compression at microscale

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图 11 PTFE/Al在SHPB加载下反应预测曲线的拟合

Figure 11. Curves fitting for predicting the impact initiation of PTFE/Al samples by SHPB

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表 1 SHPB冲击加载实验结果

Table 1. Experimental results of SHPB impact loading

编号	压杆材质	应变率/s^-1	应力/MPa	反应
1	铝	9400	202	否
2	钢	9300	620	是
3	钢	7200	553	是
4	钢	7400	444	否
5	钢	4950	554	否
6	铝	5000	187	否

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表 2 SHPB冲击加载实验参数

Table 2. Parameters for SHPB impact loading experiment

图号	压杆材质	试样尺寸	冲击速度/(m·s^-1)	应变率/s^-1	应力/MPa	脉冲宽度/μs	反应
6	钢	$\emptyset $6 mm×4 mm	28	6840	535	120	是
7	铝	$\emptyset $6 mm×3 mm	31	9400	202	120	否
8	钢	$\emptyset $8 mm×8 mm	43	5150	576	120	否

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