Development of Empirical formula Prediction on Critical Impact Energy for Perforation Phenomena on Concrete Structures

Abstract

Concrete is basic construction material used for most structures. However, the vital structures have to be designed as selfprotective such as nuclear plants, power plants, weapon industries, weapons storage places, water retaining structures, highway structures, and etc. These structures should have to be offer self shield against any natural disaster tragedy incidents and intentionally produced horrible incidents such as dynamic loading, incident occurs in nuclear plants, terrorist attack, missile attack, tsunami and etc. In modern science, the impact energies are crucial way to study the local impact effects on concrete structures together with the influence of relative target thickness (H/d). This study is focused on minimum required kinetic energy for perforation of the concrete structures generated by flat nose hard missile in terms of relative target thickness (H/d), by using curve fitting empirical study with the implementation of dimensional analysis of non-dimensional numbers. For verification, the proposed developed empirical formula was well compared with other established empirical formulae such as NDRC, UMIST and Semi Empirical formulae and it is expected that the outcome of the proposed formulae can be applied in design recommendations and design procedures for determining the dynamic reaction of the concrete target to foil perforation of flat nose hard missile.

Experimental Investigation of Projectile Impact Local Damage on Cementitious Composite Slabs

“…It was shown by tests that 50% penetration of element thickness generates problem of scabbing and for 63% or more penetration, one may expect full perforation [2]. Another possible local responses described in [3] are cone cracking and plugging for punching-shear inflicted by projectile impact and radial cracking for low energy impacts. The magnitude of damage depends on a variety of factors such as impact velocity, the mass, geometry and material properties of the projectile or fragment, as well as the material properties and reinforcement of the concrete target structures.…”