Experimental Study And Numerical Simulation On Enery Projectile Penetrating Into Concrete Vertically

The effect of high-velocity projectile dynamic impact penetrating into concrete is the premise of the research on military engineering protection technique, and also is the basic of optimization of projectile shape design and physical-geometric parameters, so it is becomes a research hotspot of military technique domain over the recent ten years. By using experiment and numerical simulation on model penetration projectile of BLU-109B with different shrink ratio size, this article analysising the damage effect and influencing factors on concrete under dynamic impact penetration, and the analysising shows that the conclusion is correct by combining with the penetration experiment results of model penetration projectile with large ratio size, meanwhile, predicting the penetration depth and caving area diameter of the original shape projectile.Through the vertical penetration experiment on high-intensity concrete of C80 by using oval-type model projectile of (p30mm, studied the depth of projectile and the radius of projectile of concrete under different speeds. The experimental results indicate that: under the same target intensity and the same projectile, the diameter and the depth of caving area in the target after impacted related to the penetration initial velocity of projectile; with the penetration initial velocity fast, the penetration depth get more deeper and the area the caving area get more bigger; the penetration depth is 3～5 times as much as that of the projectile diameter, the diameter of caving area is the ten times that of the projectile diameter. Choosing the H-J-C model and the Johnson-Cook model respectively as the constitutive model of concrete and projectile, taking the process of oval-type projectile ofφ30mm penetrating concrete for study object, by the use of large finite element analytical software LS-DYNY, numerical simulating of energy projectile penetration of semi-infinite concrete target. Comparing with the result of experiment, the constitutive model and the calculation model including parameters in this article can simulate accurately for the damage effect of energy projectile penetrating into concrete, the error is lower than 5%.Completeφ100mm model projectile with large ratio size penetration experiment base onφ30mm model projectile penetration experiment, the depth and the diameter of caving area respectively is 83.5cm and 102.5cm, which is 8.4 times and 10.3 times as much as that of the projectile diameter, it indicates the experiment results of the small ratio size model penetration experiment have good coherence to the big ratio size model penetration experiment. What's more, the numerical simulation method based on the small ratio size model penetration experiment also can simulate big ratio size model penetration experiment; the errors is only 3.6%, and give simulating the depth of BLU-109B projectile penetrating into concrete is 1.60m.