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Impact Damage Tolerance of Multilayer Epoxy-Glass Composites with Xps Core and Polyurethane Prepolymer Modified Matrix

Masiewicz Joanna, Przybyłek Paweł, Szczepaniak Robert, Zahorski Tomasz, Kostrzewa Marcin, Czyż Mateusz

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 6

218--226

A significant need within the design of materials for vehicles or other engineering structures is to determine their potential to mitigate impact loads. The material acting as a shield during an impact absorbs energy, dissipating the excess in a process of irreversible deformation. In order to prevent this, or to limit the areas of damage as much as possible, have begun to be used materials that absorb impact energy without drastically compromising their strength. Energy Absorbing Composite Structures (EACS) have the ability to convert impact energy into some form of energy absorbed through deformation. Compared to homogeneous materials, a numer of factors also point to the increasing advantage of using composite sandwich structures, which, in addition to their high strength ratings, have a lower weight and a much more effective ability to absorb shock or impact load energy. This paper presents the results of damage tolerance testing of epoxy-glass sandwich composites with chemical modified matrix. The damage tolerance of the composites was determined using an Instron CEAST 9340 testing machine with an impact energy ranging from 5-35J and indicated the value at which visible damage to the composite occurs while it retains some of its strength properties. It was the most important test to determine the damage tolerance, but additional tests to characterise the strength of the composite more comprehensively were also performed. Experimental studies were used to present a methodology for the preliminary characterisation of the material strength and to analyse the relation between structure and mechanical response of the composite.