analytical model of laminar composites having fibre reinforced polyester faces and a polypropylene honeycomb core; experimental testing of the model/kiudarmeeritud poluesterpinnaga ja polupropuleenist kargtaidisega laminaatkomposiitide analuutiline mudel
INTRODUCTION Sandwich structures are used for safety important objects such as aircrafts, transport means, vessels, and pipes, since they offer great energy absorption potential and increase the flexural inertia without significant weight penalties. By varying the core, the thickness, and the material of the facesheet of the sandwich structures, it is possible to obtain various properties of battery the structure [1-3]. Sandwich materials have been a topic of many scientific investigations. The behaviour of the sandwich material under crushing loads and the ductile fracture limits are usually determined with the help of compression tests [4]. Cores are the weakest part of sandwich structures and they fail due to shear stress. The shear strength properties of the sandwich core are important in the design of sandwich structures subjected to flexural loading. Three-point bending tests are performed to find the flexural and shear stiffness of sandwich beams [5]. Mechanical behavio...