Abstract
Concrete is basic construction material used for numerous sort of structure. However, in the mainstream crucial structures have to be designed as self-protective such as nuclear plants, Power plants, Weapon Industries, weapons storage places, water retaining structures like dams, & etc., which provides protection against any tragedy incident or intentionally produced horrible incidents such as dynamic loading, incident occurs in nuclear plants, terrorist attack, war, missile attack, and etc. This paper questioningly is paying concentration on judgment on minimum required kinetic energy for scabbing on the concrete structures generated by flat nosed hard missile using curve fitting empirical study. Argue overcome from this newly developed empirical formula can be used for making design recommendations and design procedures for determining the dynamic reaction of the target to frustrate scabbing.
Highlights
Over the years, concrete is very commonly used construction material for the defensive and civil applications to protect structures from local and explosive impact loads
Overall predictions based on both NDRC and semi-empirical formulae are closer to experimental data than those based on UMIST formulae, the NDRC and semi-empirical formulae sometimes overestimate the critical impact energy for the scabbing of concrete target
The influence of the relative target thickness (H/d) on the critical impact energies, at which scabbing in concrete targets may be initiated by hard missile, has been investigated in this paper
Summary
It is important to consider the mechanics of the impact processes and deduce the relevant non-dimensional numbers that could be involved in scabbing analyses. When a non-deformable, flat-nosed projectile strikes a concrete target, scabbing could occur due to the reflection of the impact-induced compressive stress wave from the distal free surface of the target. This occurs in a much shorter time than complete perforation or the overall structural response. The scabbing limit is normally selected as a design parameter in empirical formulae, the critical impact velocity to cause scabbing for given target thickness is another important parameter associated with scabbing. Some empirical formulae for critical impact energy are formulated for the onset of scabbing. Ft/fc and E/fc may be considered as constants
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