Abstract
Numerical analysis was used to estimate influence of orientation of composite material layers on strain changes in a constructive element. A finite element method was used to conduct a strain-stress state analysis. A cylindric shell with a radius of 300 mm, a height of 600 mm and a wall thickness of 1,56 mm was examined. The shell consisted of eight differently oriented carbon fiber layers, that were impregnated with epoxy resin. Plate Laminate type elements were used to imitate composite layers orientation and to create a model of cylindric shell walls. Lower base of the cylinder had rigid fasteners and the upper base was under external loading. During strain-stress state analysis of composite layers were examined following loading types: axial tension, bend, torsion, internal pressure. Numerical analysis revealed that tension distribution in layers of composites depends on layer orientation and the cylindric shell loading type. Moreover, this paper defines estimated fatigue life of the shell under pulsatory load. It was determined that characteristics of fatigue strength of the constructive element depend on loading type.
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