Post-impact flexural capacity of UHPFRC plates

Candida Talone,Jindřich Fornůsek,Michal Mára,Radoslav Sovják,D Papán,M Ščotka,Z Zvaková

doi:10.1051/matecconf/202135200006

Abstract

This work aims to demonstrate the effective use of fibre reinforcement in thin plate elements made of UHPFRC under projectile impact loading. The use of fibre reinforcement is very efficient in case of ballistic loading, as fibres are evenly distributed over the entire volume of the material body and possible damage to the plate is thus suppressed in all points of the plate element equally. The aim of this study is therefore to provide data on the residual flexural capacity of plates that have been significantly damaged by the impact of the projectile and to demonstrate the benefits of using fibre reinforcement for localized impact loading.

Highlights

Concrete is a material that has been used for ballistic protection for decades
The biggest advantage of fibrous reinforcement is its even distribution over the volume of the examined element. This fact is essential from the point of view of terminal ballistics because the projectile can hit an element in virtually any place. This ensures the uniform resistance of the ballistic element in its entire volume, which is a clear advantage over conventional concrete bar reinforcement
The experimental campaign aimed to test the flexural capacity of thin plates made of ultra-highperformance fibre-reinforced cementitious composites (UHPFRC) and to determine the load-deflection diagram of these plates in flexure

Summary

Introduction

With the development of building chemistry and dispersed fibre reinforcement in the form of microfibres, development and research in the field of concrete structures has reached ultra-highperformance fibre-reinforced cementitious composites (UHPFRC), which have a very high ability to absorb and dissipate mechanical energy at different strain rates This is primarily determined by the use of fibrous reinforcement, which slowly begins to be pulled out of the cement matrix when the micro-cracks are opened, consuming a large amount of mechanical energy [1]. The biggest advantage of fibrous reinforcement is its even distribution over the volume of the examined element This fact is essential from the point of view of terminal ballistics because the projectile can hit an element in virtually any place. Previous research on the dynamic testing of high-performance fibre-reinforced concrete and foam concrete is described in [6, 7, 8, 9]

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