| Abstract [eng] |
Strength properties better than steel and extremely low weight of composite structures, especially using carbon and glass fiber reinforced polymer composites (CFRP and GFRP), can be achieved. The use of GFRP and CFRP for lightweight constructions is very promising. A new type composite construction of glider “LAK 17A” wing is analyzed and its numerical model is created in this project. Nowadays, there is a lack of researches of composite constructions. Their strength evaluation methods are not as well–known as the methods of the same steel structures. Mostly the strength of composite structures is analyzed by performing experiments what is expensive and time consuming. When factories do not have possibilities for experimental testing, these constructions are designed by adding additional layers of the composite to make them safe. This increases the necessity of materials and also the cost of all construction. The problem, mentioned before, can be solved by using a reliable numerical model to evaluate composite structures. The aim of this project is to create a reliable validated finite element model (FEM) which could be used for the similar type composite constructions evaluation. There are several tasks to achieve the aim identified: (1) to analyze glider “LAK 17A” wing and similar constructions and their researches. The main construction features, requirements are identified and the similarities between analyzed composite constructions are found. Composite constructions research analysis helps to choice suitable type of FEM and shows the lack of numerical models of these constructions; (2) to create a FEM of glider wing component validated by experiment. During this step experiments, necessary to find mechanical properties of the wing construction, are done. According to the experimental results, validated FEM of experiment specimen is done; (3) to make the all wing “LAK 17A” construction FEM. The computational scheme is selected and the model is created according to the validated FEM of specimen and by evaluating the most critical areas of the construction; (4) to analyze the results of simulation of glider wing “LAK 17A” composite construction and evaluate the strength of it, also the reliability of this created model. Conclusions about construction strength are made. Results are compared with deformation results of real structures. Finally, conclusion about model reliability and possibility to use it for the similar type constructions is made. |
