Publication History Issue online: The projectile structure is the main factor affecting the projectile penetration performance, including the penetration ability, and the trajectory and structural stabilities under the condition of a given quality, velocity, and material. Thus, the crater depth Hc m can be expressed as follows:. The physicist Sir Isaac Newton first developed this idea to get rough approximations for the impact depth for projectiles traveling at high velocities. The projectile can be considered as a rigid body at low velocities. The nose shape coefficients change because of the variation in nose shape and CRH; thus, penetration resistance varies.
A unified approach for concrete impact - ScienceDirect
SCS panel is an effective means of protecting structures against extreme impact and blast loading due to its high strength and high ductility characteristics. With the dimensional analysis, main non-dimensional parameters which control the penetration depth are obtained with some reasonable hypothesis. Over the course of time, the rate of heat transfer is decreasing. Figures - uploaded by Chenguang Huang. Martin SQ Modelling of local impact effects on plain and reinforced concrete.
The rate of heat transfer depends on the material through which heat is transferred. UK Nuclear Electric NE initiated a major research program on the impact behaviour of reinforced concrete structures in The assessment of impact on nuclear power plant structures in the United Kingdom. NDRC Effects of impact and explosion. We will not discuss that equation here.
However, as shown in Figures 7 and 8 , the comparisons of the penetration abilities of the projectiles with the same structures and different materials indicated that the effects of these two types of materials on the test results were not obvious under these experimental conditions. Thus, the quadratic polynomial form of is expressed as follows: To stop the impactor, this momentum must be transferred onto another mass. Most of the existing crater depth models Forrestal et al. Hence, the penetration depth curve is calculated as. Mathematical Problems in Engineering.