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Analysis of Aeronautical Composite Structures under Static Loading
Cejpek, Jakub ; Juračka, Jaroslav (oponent) ; Cabrnoch, Bohuslav (oponent) ; Jebáček, Ivo (vedoucí práce)
Relatively large number of private companies in the Czech Republic are producing light sport aircraft. Significant number of these airplanes use composite landing gear springs. These springs are either smaller parts that absorb energy (nose and tail gear springs) or they can be used for the main landing gear. All these types of springs share very similar characteristics: they are made mostly of unidirectional composite of significant thickness, the main loading character is bending moment and large deformations are expected. In fact the wing main spar shares similar characteristic. How are these products designed and analysed? Generally there are two possibilities. First possible way, to design such product, is to make just a simple analysis (closed-form solution, perhaps some spreadsheet table). The drawbacks of this method are limited capabilities and inflexible application. Second option is to perform an analysis study, perhaps even optimization loops in a professional dedicated finite element program. Of course the drawback is the price (for the program and for the engineer). This dissertation thesis aims to develop a computer program, that will offer third possibility: thorough analysis of given products without expensive software. This program will simplify and speed up the design and strength analysis. It will allow user to quickly test different variants. Specifics of the targeted products (such as large deformations, local through-thickness stress concentrations and wrap plies) will be taken into account. From the user's point of view the program should be simple to work with. Minimum input data with clear graphical user interface layout ensures comfortable use. Having a stand alone program (executable without any supplementary software) improves the distribution potential.
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Analysis of Aeronautical Composite Structures under Static Loading
Cejpek, Jakub ; Juračka, Jaroslav (oponent) ; Cabrnoch, Bohuslav (oponent) ; Jebáček, Ivo (vedoucí práce)
Relatively large number of private companies in the Czech Republic are producing light sport aircraft. Significant number of these airplanes use composite landing gear springs. These springs are either smaller parts that absorb energy (nose and tail gear springs) or they can be used for the main landing gear. All these types of springs share very similar characteristics: they are made mostly of unidirectional composite of significant thickness, the main loading character is bending moment and large deformations are expected. In fact the wing main spar shares similar characteristic. How are these products designed and analysed? Generally there are two possibilities. First possible way, to design such product, is to make just a simple analysis (closed-form solution, perhaps some spreadsheet table). The drawbacks of this method are limited capabilities and inflexible application. Second option is to perform an analysis study, perhaps even optimization loops in a professional dedicated finite element program. Of course the drawback is the price (for the program and for the engineer). This dissertation thesis aims to develop a computer program, that will offer third possibility: thorough analysis of given products without expensive software. This program will simplify and speed up the design and strength analysis. It will allow user to quickly test different variants. Specifics of the targeted products (such as large deformations, local through-thickness stress concentrations and wrap plies) will be taken into account. From the user's point of view the program should be simple to work with. Minimum input data with clear graphical user interface layout ensures comfortable use. Having a stand alone program (executable without any supplementary software) improves the distribution potential.
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