| Title |
Experimental Study on Validation of Nose Shape Factors of Projectile in Existing Impact formulas for High-Strength Concrete |
| Authors |
Kim, Sang-Hee ; Kang, Thomas H.-K. ; Hong, Sung-Gul |
| DOI |
https://doi.org/10.5659/JAIK_SC.2019.35.2.13 |
| Keywords |
High-Strength Concrete ; Nose Shape Factor of Projectile ; Impact Formula ; Penetration Depth |
| Abstract |
This study was conducted in order to validate the nose shape factors of projectile in existing impact formulas for high-strength concrete in the event of collision with high-speed projectiles. In order to conduct the high-speed impact experiment, specified concrete strengths of 35, 100, and 120 MPa were prepared and tested in collision with both conical and hemispherical projectiles. The results showed that the measured penetration depth did not decrease linearly as concrete strength increased. Comparing the ratio penetration depth to the kinetic energy of the conical and hemispherical projectiles, the difference in the ratios for high strength concrete was observed to decline as concrete strength increased. However, in the modified NDRC and the Hughes formulas, the difference in the predicted penetration depth of the conical and hemispherical projectiles was constant despite increasing concrete strength. The modified NDRC and Hughes formulas should be improved upon so as to be applied to high strength concrete. |