| Abstract [eng] |
In this work structures of composite gliders were analyzed, as well as gliders fatigue tests, their requirements and equipment. Also, cohesive behavior of composite materials was analyzed and application of cohesive parameters for design process of such structures was discussed. Results of the LAK-17A glider fatigue test were analyzed. Fatigue induced damage of the wing was presented. Changes of the wings stiffness were calculated. In order to analyze the strength properties of the LAK-17A gliders spar cap construction, while under cyclic loading, special test specimens were manufactured and tested. Static and fatigue tests, of carbon fiber rods glued with epoxy resin, were performed. Based on the tests results, an analytical life time prediction model was proposed. Numerical FEM models of the tested structure were proposed, that are used for static and cyclic loading calculations. |
