不同W含量Al/W活性材料的冲击压缩特性

宋超慧; 任会兰; 李尉; 郝莉

doi:10.11858/gywlxb.20210738

不同W含量Al/W活性材料的冲击压缩特性

doi: 10.11858/gywlxb.20210738

宋超慧^1,,
任会兰^1,*, ,,
李尉¹,
郝莉²

1.
北京理工大学爆炸科学与技术国家重点实验室，北京　100081
2.
北京建筑大学理学院，北京　100044

基金项目: 国家自然科学基金（11872124）

详细信息

作者简介:
宋超慧（1996－），男，硕士研究生，主要从事材料动力学性能研究. E-mail：chaohuisong@bit.edu.cn

通讯作者:
任会兰（1973－），女，教授，主要从事多孔材料动力学行为研究. E-mail：huilanren@bit.edu.cn

中图分类号: O347.3; TB333
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出版历程
- 收稿日期: 2021-03-09
- 修回日期: 2021-04-02

Impact Compression Characteristics of Al/W Active Materials with Different W Additions

SONG Chaohui^1
,,
REN Huilan^{1,*
, ,},
LI Wei¹,
HAO Li²

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2.
School of Science, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

摘要

摘要: 采用模压烧结工艺制备不同W含量的Al/W活性材料，基于分离式霍普金森压杆（SHPB）技术，采用紫铜片和橡胶片进行波形整形，研究不同配比Al/W材料的动态压缩和破坏特性。实验结果表明：随着W含量增多，Al/W材料内部的孔洞、微裂纹逐渐增多；W含量不同，Al/W材料的动态压缩变形和破坏特性呈现明显的差异；W的质量分数为44%和64%时，不同应变率下Al/W的应力-应变曲线呈现出弹性-塑性强化的变形特点，破坏应变随应变率增加而增大； W的质量分数为83%的Al/W材料则表现为塑性阶段的应变软化特点；当W的质量分数达到91%时，Al/W材料达到破坏强度后便迅速失效，破坏应变保持在0.03左右。W含量增加时，Al/W变形模式的转化是增强相W和材料内缺陷相互竞争的结果。
- Al/W活性材料 /
- 波形整形技术 /
- 动态压缩强度
Abstract: In this paper, Al/W active materials with different W additions were prepared by molding and sintering processes. Based on the split Hopkinson pressure bar (SHPB) technology, copper sheets and rubber sheets were used for wave shaping, and dynamic compression and destruction characteristics of Al/W materials with different ratios were evaluated. The experimental results showed that with the increase of W additions, the pores and microcracks inside the Al/W material gradually increased. With different W additions, the dynamic compression deformation and failure characteristics of the Al/W material exhibited obvious differences. When the mass fractions of W are 44% and 64%, the stress-strain curves of Al/W under different strain rates exhibited elastic-plastic strengthening deformation characteristics, and the failure strain increased with the increase of strain rate. Al/W materials with a W mass fraction of 83% exhibited the strain softening characteristic in the plastic deformation stage. When the W mass fraction reached 91%, the Al/W material failed quickly after reaching the breaking strength, and the breaking strain is maintained at about 0.03. With the increase of W additions, the transformation of Al/W deformation mode is the result of the interaction between the reinforcing phase W and the internal defects of the material.
- Al/W active material /
- waveform shaping technology /
- dynamic compression strength

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图 1 Al/W试样

Figure 1. Al/W samples

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图 2 Al/W活性材料的微观形貌

Figure 2. Micrographs of Al/W materials with different W additions

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图 3 SHPB系统

Figure 3. SHPB system

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图 4 不同整形器产生的入射波

Figure 4. Incident waves generated by different pulse shapers

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图 5 紫铜整形器对不同配比的Al/W试件应力均匀性和加载应变率的影响

Figure 5. Effect of copper pulse shapers on the stress uniformity and loading strain rate of specimens with different Al/W ratios

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图 6 使用橡胶整形器的SHPB实验结果

Figure 6. SHPB experiment results using rubber pulse shaper

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图 7 Al/W材料的动态真应力-真应变曲线

Figure 7. Dynamic true stress-true strain curves of Al/W materials

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图 8 SHPB实验后 Al/W 试件的破坏情况

Figure 8. Deformation of Al/W specimens after SHPB tests

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图 9 不同应变率下Al/W压缩的真应力-应变曲线

Figure 9. Al/W dynamic true stress-strain curves under different strain rates

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表 1 Al/W试件相关参数

Table 1. Al/W specimen parameters

Test No. Specimen code Mass fraction of W/% Density/(kg·m⁻³) Volume porosity/%

1 AW-44 44 3740 14.5
2 AW-64 64 4950 18.1
3 AW-83 83 6860 27.7
4 AW-91 91 8370 32.9

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表 2 不同配比Al/W试件的动态压缩力学性能

Table 2. Dynamic compression mechanical properties of Al/W with different W additions

Material Strain rate/s⁻¹ Dynamic compression yield strength/MPa

AW-44 1745 137.2
AW-64 1716 168.2
AW-83 1715 187.4
AW-91 1770 157.7 (failure strength)

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