Experiment on crater characteristics of aluminium targets impacted by magnesium projectiles at velocities of about 10 km/s

WANG Mafa; ZHOU Zhixuan; HUANG Jie; LUO Qing; LONG Yao; JIAO Dezhi; LIU Sen

doi:10.11883/bzycj-2020-0129

Volume 41 Issue 5

May 2021

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WANG Mafa, ZHOU Zhixuan, HUANG Jie, LUO Qing, LONG Yao, JIAO Dezhi, LIU Sen. Experiment on crater characteristics of aluminium targets impacted by magnesium projectiles at velocities of about 10 km/s[J]. Explosion And Shock Waves, 2021, 41(5): 053302. doi: 10.11883/bzycj-2020-0129

Citation:

WANG Mafa, ZHOU Zhixuan, HUANG Jie, LUO Qing, LONG Yao, JIAO Dezhi, LIU Sen. Experiment on crater characteristics of aluminium targets impacted by magnesium projectiles at velocities of about 10 km/s[J]. Explosion And Shock Waves, 2021, 41(5): 053302. doi: 10.11883/bzycj-2020-0129

Citation:

WANG Mafa, ZHOU Zhixuan, HUANG Jie, LUO Qing, LONG Yao, JIAO Dezhi, LIU Sen. Experiment on crater characteristics of aluminium targets impacted by magnesium projectiles at velocities of about 10 km/s[J]. Explosion And Shock Waves, 2021, 41(5): 053302. doi: 10.11883/bzycj-2020-0129

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Experiment on crater characteristics of aluminium targets impacted by magnesium projectiles at velocities of about 10 km/s

doi: 10.11883/bzycj-2020-0129

Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center,Mianyang 621000, Sichuan, China

Received Date: 2020-05-06
Rev Recd Date: 2020-09-03

Available Online: 2021-03-05

Publish Date: 2021-05-05

Abstract

Abstract

Crater characteristics formed by the impact of the 5 cm thick Al 6061 targets with magnesium projectiles with length-diameter ratio l/d_p=1/2 and diameter d_p=0.8 cm at velocity of 10 km/s were investigated. The implosion-driven launcher designed by McGill University was manufactured by China Aerodynamics Research and Development Center. Eight experiments were carried out and the obtained maximal projectile velocities were in the range of 9.36−11.43 km/s. The profiles and flight attitude of projectile were snapped by use of the sequence laser shadowgraph imaging instrument. The results show that the projectiles deform obviously during the launching period in some experiments, but more than half projectiles could hold the initial shape well. Craters on targets were recovered and analyzed. A shallow damage area appeared around the semi-spherical crater. Such crater feature was compared with those craters impacted at velocity lower than 8 km/s in literatures and from other experiments with different projectile materials and aluminum types of targets. Typical dimensions of craters were measured. The crater depths P_c/d_p was 1.5−2.0, crater diameters d_c/d_p was 3.0−3.5, crater-shape coefficient P_c/d_c was about 0.50 and cratering efficiency E/V_c was about 3.74 kJ/cm³. Finally, the influences of l/d_p, impact velocity and energy of projectiles on crater dimensions were analyzed along with the experimental data from literatures. An effective diameter of cylindrical projectile was proposed to reduce the effect of l/d_p on the crater depth. And a crater depth formula of aluminum targets impacted by projectiles with different materials and velocities were fitted. Results show that the typical impact crater should not only be the central semi-sphere crater, but also contain shallow damage area formed by surface spallation. The type of target material influences the carter feature significantly. However, the projectile material and flight attitude have little influence on the crater feature. As for projectiles with l/d_p≤1, the crater depth normalized by effective diameter would not vary with l/d_p, but correlate with the impact velocity in form of 2/3 power law.
- crater characteristics,
- impact experiment,
- magnesium alloy projectile,
- thick aluminium target

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References(18)

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