Ti-6Al-4V在高应变率下的动态剪切特性及失效机理

张炜琪; 许泽建; 孙中岳; 仝毅; 黄风雷

doi:10.11883/bzycj-2017-0107

Ti-6Al-4V在高应变率下的动态剪切特性及失效机理

doi: 10.11883/bzycj-2017-0107

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 11772062

国家自然科学基金项目 11302030

爆炸科学与技术国家重点实验室自主研究项目 YBKT17-03

详细信息

作者简介:
张炜琪(1991-), 女, 硕士研究生

通讯作者:
许泽建, xuzejian@bit.edu.cn

中图分类号: O346.1
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- 文章访问数: 5789
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- 被引次数: 0
出版历程
- 收稿日期: 2017-04-01
- 修回日期: 2017-09-11
- 刊出日期: 2018-09-25

Dynamic shear behavior and failure mechanism of Ti-6Al-4V at high strain rates

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

摘要

摘要: 采用基于霍普金森压杆的新型加载技术对Ti-6Al-4V材料的动态剪切特性及失效机理进行了测试研究。获得了Ti-6Al-4V材料在超过10⁴ s^-1应变率下的剪应力-剪应变曲线及失效参数。研究发现，材料的流动应力存在明显的应变率强化效应；随着应变率的增加，材料的失效应力逐渐增大，而失效应变逐渐减小。采用ABAQUS/Explicit对加载过程进行了数值模拟。结果显示，剪切区材料基本处于平面剪切状态，应力应变场分布较为均匀，计算得到的剪应力-剪应变曲线与实验结果吻合较好。经断口分析可知，随着应变率的升高，Ti-6Al-4V的失效机理存在由韧窝、拉伸韧窝至台阶及河流花样的演化过程，材料的失效模式主要表现为韧性断裂。
- 动态剪切 /
- 双剪切试样 /
- 高应变率 /
- 微观机理
Abstract: Dynamic shear properties and failure mechanism of Ti-6Al-4V were studied at strain rates in excess of 10⁴ s^-1, with a new loading method based on the split Hopkinson pressure bar (SHPB) technique. The shear stress-shear strain curves and failure parameters of Ti-6Al-4V were acquired in a wide range of high shear strain rates. It is found that the flow stress of the material shows an obvious strain rate hardening effect. With the increase of strain rates, the failure stress of the material increases gradually, while the failure strain decreases. The loading process was modeled by ABAQUS/Explicit software. The results show that the shear zone material is substantially in the state of plane shear. The tested stress-strain curves have good agreement with the simulated results. The fracture surface examination shows that with the increase of strain rate, the failure of Ti-6Al-4V is closely related to the different behaviors of dimples, and it indicates an evolution process from dimples and tensile dimples to steps and river patterns. The fracture analyses show that the failure mode of the material is mainly ductile fracture.
- dynamic shear /
- double shear specimen /
- high strain rate /
- micro-mechanism

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图 1 试样结构示意图

Figure 1. Schematic diagram of sample

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图 2 典型实验波形图

Figure 2. Typical stress waves measured in Hopkinson bars

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图 3 Ti-6Al-4V在不同应变率下的剪应力-剪应变曲线

Figure 3. Shear stress-shear strain curves ofTi-6Al-4V at different strain rates

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图 4 Ti-6Al-4V在不同应变率下的失效应变

Figure 4. Failure strains of Ti-6Al-4Vat different shear strain rates

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图 5 Ti-6Al-4V在不同应变率下的失效应力

Figure 5. Failure stresses of Ti-6Al-4Vat different shear strain rates

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图 6 模型装配图

Figure 6. Model assembly drawing

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图 7 入射、反射和透射应变信号的实验和模拟结果比较

Figure 7. Comparison of incident, reflected and transmittedstrain waves between experimental and simulated results

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图 8 试样剪切区的应力、应变分量

Figure 8. Stress/strain components in whole shear zone

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图 9 应力-应变曲线的实验与数值模拟结果对比

Figure 9. Comparison of stress-strain curvesbetween experimental and simulation results

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图 10 Ti-6Al-4V剪切断口形貌

Figure 10. Fractography of Ti-6Al-4V

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图 11 Ti-6Al-4V剪切断口形貌

Figure 11. Fractography of Ti-6Al-4V

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图 12 Fractography of Ti-6Al-4V

Figure 12. SEM microstructure of Ti-6Al-4V fracture surfaces

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表 1 数值模拟的主要材料参数

Table 1. Material parameters in FE simulation

部位	材料	ρ/(g·cm^-3)	E/GPa	ν	λ/(W·m^-1·K^-1)
入射杆	18Ni钢	8.0	190	0.3	-
试样	Ti-6Al-4V	4.43	114	0.33	6.7
透射杆	7075铝合金	2.7	70	0.3	-

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