• Jemielita, Grzegorz Eugeniusz
• Kruszka, Leopold
• Kozyra, Zofia Józefa

Abstract

<p>An experimental analysis is carried out to model transverse impact of free-free and free supported square duralumin beams loaded at various locations along their length. The applied impact load is acquired from tests perform on a single Hopkinson measuring bar (SHB) fitted up with a high speed camera. The experimental stand consisted of a Hopkinson measuring bar brought in contact with the beam. In this one-point impact test, a cylindrical striker, fired by the air gun, impacts the Hopkinson bar and generates stress waves that travel along the bar and interfere with the aluminum beam. The stress waves are recorded by strain gages installed on the Hopkinson measuring bar. These are used to calculate the implemented load on the beam. Dynamical displacements of the impact zone of the examined beam are registered with the high speed camera. The dynamic tests demonstrate that the plastic deformation, adjacent to the impact location, results from combined dominant bending and stretching modes. Most of the plastic deformation is confined to the impact zone of the tested beams. The plastic strain magnitude and distribution close to the impact zone is comparable for all tested impact locations, however it is higher for the more symmetrical impacts. The transformation of impact energy into kinetic, elastic strain energy and plastic dissipation work is distinguished for various impact locations along the specimen of beam.</p>

Topics

• impedance spectroscopy
• polymer
• aluminium
• impact test