Cratering for Impact of Hypervelocity Projectiles into Granite Targets within a Velocity Range of 1.91–3.99 km/s: Experiments and Analysis

Applied Sciences

Xin Bao¹  Xiaofeng Wang¹  Jingbo Liu¹  Jiarong Huang²  Defeng Kong²  Xiangyun Xu²  Biao Wu² 

[1] Department of Civil Engineering, Tsinghua University, Beijing 100084, China;Institute of Defense Engineering, AMS, PLA, Beijing 100036, China;

关键词: projectile;    hypervelocity impact;    crater;    granite target;    scaling law;   

DOI  :  10.3390/app10041393

来源: DOAJ

【 摘 要 】

To understand and analyze crater damage of rocks under hypervelocity impact, the hypervelocity impact cratering of 15 shots of hemispherical-nosed cylindrical projectiles into granite targets was studied within the impact velocity range of 1.91−3.99 km/s. The mass of each projectile was 40 g, and the length−diameter ratio was 2. Three types of metal material were adopted for the projectiles, including titanium alloy with a density of 4.44 g/cm³, steel alloy with a density of 7.81 g/cm³, and tungsten alloy with a density of 17.78 g/cm³. The projectile−target density ratio (ρ_p/ρ_t) ranged from 1.71 to 6.86. The depth−diameter ratios (H/D) of the craters yielded from the experiments were between 0.14 and 0.24. The effects of ρ_p/ρ_t and the impact velocity on the morphologies of the crater were evaluated. According to the experimental results, H/D of craters is negatively correlated with the impact velocity, whereas the correlation between H/D and ρ_p/ρ_t is weak positive. The crater parameters were expressed as power law relations of impact parameters by using scaling law analysis. The multiple regression analysis was utilized to obtain the coefficients and the exponents of the relation equations. The predicted values of the regression equations were close to the experimental results.

【 授权许可】

Unknown