Study on the impact initiated reaction of Ti-6Al-4V prejectiles by the fracture modes

HE Liling; ZHANG Fangju; YAN Yixia; XIE Ruoze; XU Aimin; ZHOU Yanliang

doi:10.11883/bzycj-2020-0046

Volume 40 Issue 12

Dec. 2020

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HE Liling, ZHANG Fangju, YAN Yixia, XIE Ruoze, XU Aimin, ZHOU Yanliang. Study on the impact initiated reaction of Ti-6Al-4V prejectiles by the fracture modes[J]. Explosion And Shock Waves, 2020, 40(12): 122301. doi: 10.11883/bzycj-2020-0046

Citation:

HE Liling, ZHANG Fangju, YAN Yixia, XIE Ruoze, XU Aimin, ZHOU Yanliang. Study on the impact initiated reaction of Ti-6Al-4V prejectiles by the fracture modes[J]. Explosion And Shock Waves, 2020, 40(12): 122301. doi: 10.11883/bzycj-2020-0046

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Study on the impact initiated reaction of Ti-6Al-4V prejectiles by the fracture modes

doi: 10.11883/bzycj-2020-0046

HE Liling^{1, 2
,},
ZHANG Fangju^{1, 2},
YAN Yixia^{1, 2},
XIE Ruoze^{1, 2
,
,},
XU Aimin^{1, 2},
ZHOU Yanliang¹

1.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621999, Sichuan, China

Received Date: 2020-02-28
Rev Recd Date: 2020-08-25
Publish Date: 2020-12-05

Abstract

Abstract

Ti-6Al-4V is a kind of important alternative material for light-weight design of warhead whose impact-initiated reaction could enhance the damage power of the weapon. However, there is not enough research on the condition and mechanism of its impact-initiated reaction. Through experimental and theoretical analyses, the influences of fracture modes of Ti-6Al-4V structure on impact initiated reaction were studied in the present paper, in order to obtain the condition and mechanism of impact-initiated reaction of Ti-6Al-4V material. Two types of projectiles were designed to normally penetrate the unreinforced concrete target, i.e., the titanium projectile with ogival nose and the composite projectile with C/C nose and hollow titanium cylinder. The impact velocity followed between 222 m/s and 1008 m/s. Two projectiles exhibit different fracture modes. In the studied velocity range, there is an impact-initiated reaction during penetration for the titanium projectile, but no reaction is observed during the impact of the composite projectile. The fracture modes of the two projectiles were analyzed in the macroscopic and microscopic views. After penetration, the structure of the titanium projectile is almost intact. Only abrasion is observed on the outer-surface of the projectile. The main failure mode for abrasion is the shear deformation of its microstructure, which induces fragments with lengths in micrometers or hundreds of micrometers. The number of fragments could be up to 3 millions. For the hollow titanium cylinder in the composite projectile, it is teared up into large fragments, whose dimensions are in millimeters. The tearing surface develops along the shear band. The largest number of fragments is almost 120. Further analyses indicate that the efficiency of oxygen and heat supply is reverse proportional to the size of the fragment. Under certain oxygen and heat supply, the necessary condition to initiate the impact reaction of Ti-6Al-4V is that the size of fragments should be small enough. This must be the essential reason for the impact reaction in an ogival titanium projectile and no reaction in a composite projectile during penetration. With the necessary condition to initiate the impact reaction, the greater the number of fragments, the higher the impact reaction intensity is.
- impact-initiated reaction,
- Ti-6Al-4V,
- fracture modes,
- size/number of fragments,
- efficiency of oxygen/heat supply,
- reaction intensity

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References(21)

References

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