应变率和孔隙率对规则多孔钛压缩力学性能的影响

王婧; 任会兰; 申海艇; 宁建国

doi:10.11858/gywlxb.2017.00.003

应变率和孔隙率对规则多孔钛压缩力学性能的影响

doi: 10.11858/gywlxb.2017.00.003

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 11572049

详细信息

作者简介:
王婧(1988—), 女，博士研究生，主要从事多孔材料动力学性能研究.E-mail:wangjing1988@bit.edu.cn

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

中图分类号: O347; TB34
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出版历程
- 收稿日期: 2017-02-06
- 修回日期: 2017-03-13

Effects of Strain Rate and Porosity on the Compressive Behavior of Porous Titanium with Regular Pores

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

摘要

摘要: 采用普通材料测试机和分离式霍普金森压杆(SHPB)实验装置对孔隙规则排布的多孔钛试样进行准静态及动态单轴压缩实验，研究了应变率和孔隙率对多孔钛材料弹性模量、屈服强度和能量吸收能力的影响。结果表明：在不同应变率下，规则多孔钛应力-应变曲线在特定区域均可近似为双线性模型；孔隙率对弹性模量、屈服强度和能量吸收能力有直接影响，屈服强度和能量吸收能力均与应变率相关，并给出了同时考虑孔隙率和应变率对屈服强度影响的经验公式。
- 多孔钛 /
- 应变率 /
- 孔隙率 /
- 杨氏模量 /
- 屈服强度 /
- 能量吸收
Abstract: Using a material testing machine and the split Hopkinson pressure bar (SHPB) system, we investigated the quasi-static and dynamic compressive behaviors of porous titanium with regular pores, and studied the effects of the strain rate and porosity on the Young's modulus, yield strength and energy absorption of the porous titanium.The experimental results show that the stress-strain curves of the porous titanium can be approximately described by a bi-liner model in a specific range, and the porosity directly affects the Young's modulus, while the yield strength and energy absorption of the porous titanium vary with the stain rate.An empirical relation of the yield strength of the porous titanium was developed using these findings.
- porous titanium /
- strain rate /
- porosity /
- Young's modulus /
- yield strength /
- energy absorption

HTML全文

图 1 孔隙率为20%的试样照片

Figure 1. Picture of titanium sample (porosity 20%)

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图 2 霍普金森压杆装置示意图

Figure 2. Schematic of SHPB

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图 3 准静态压缩下多孔钛和实体钛的应力-应变曲线

Figure 3. Stress-strain curves of porous andsolid titanium under quasi-static loading

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4(a) 动态压缩下孔隙率20%多孔钛试样的应力-应变关系

4(a). Stress-strain curves of porous titaniumwith porosity 20% under dynamic loading

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4(c) 动态压缩下孔隙率45%多孔钛试样的应力-应变关系

4(c). Stress-strain curves of porous titaniumwith porosity 45% under dynamic loading

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图 5 不同应变率下孔隙率对试样应力-应变曲线的影响

Figure 5. Effect of strain rate and porosity on the stress-strain curve

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图 6 准静态压缩下试样及其截面变形

Figure 6. Deformed porous titanium samples and their cross-section views under quasi-static loading

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图 7 动态载荷下试件的变形情况

Figure 7. Deformed porous titanium samples under dynamic loading

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图 8 动态载荷下试件截面的变形情况

Figure 8. Cross-section views of deformed porous titanium samples under dynamic loading

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4(b) 动态压缩下孔隙率33%多孔钛试样的应力-应变关系

4(b). Stress-strain curves of porous titaniumwith porosity 33% under dynamic loading

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图 9 杨氏模量的实验和拟合结果对比

Figure 9. Comparison between experimentaland fitting results of Young's modulus

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图 10 不同应变率及孔隙率下屈服强度的实验(实心符号)和拟合(线)结果对比

Figure 10. Comparison between experimental (solid symbols) and fitting (line) results ofyield strength at different strain rates and porosities

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图 11 屈服强度的实验和拟合结果三维对比

Figure 11. Three-dimensional comparison between experimental and fitting results of yield strength

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图 12 压缩应变为4%时应变率对能量吸收的影响

Figure 12. Energy absorption vs. strain ratefor porous titanium samples at strain 4%

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表 1 不同应变率和孔隙率下失效应变大小顺序

Table 1. ize order of failure strain with different porosities and strain rates

Strain rate/(s^-1)	Sequence
600	ε_45%^f≥ε_33%^f≥ε_20%^f
1 100	ε_33%^f≥ε_20%^f≥ε_45%^f
1 500	ε_33%^f≥ε_20%^f≥ε_45%^f
2 100	ε_20%^f≥ε_33%^f≥ε_45%^f

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