Abstract

English

Highlights

  • The dynamic evolution of solutions used by designers of aircraft load-bearing structures, initiated in the 1920s, resulted in establishment of aircraft operation standards based on assumptions which would be unacceptable for any other type of engineering structures

  • This paper presents a number of results obtained from experiments and numerical analyses concerning a representative fragment of semi-monocoque aircraft load-bearing structure weakened by presence of a cutout

  • As far as the quantitative comparison is concerned, the solution employing fragmentary stringers seems to be more favourable, as in this case the maximum displacements are smaller by about 10% compared to the structure in which only fragmentary frames were used as stiffening components

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Summary

Numerical analysis and experimental tests

Stany zakrytycznych deformacji półskorupowych konstrukcji walcowych z dużymi wykrojami w warunkach obciążeń eksploatacyjnych. The paper is a presentation of experimental model studies on thin-walled cylindrical structures containing large cut-outs subject to torsional deflection. The effect of rigidity of the frame reinforcing a cut-out on form and magnitude of post-buckling deformations occurring in operation conditions is analysed. A methodology based on numerical tools is proposed for determining alternative solutions in the design of structure skeleton leading to improvement of operation stability. Przeanalizowano wpływ sztywności ramy wzmacniającej wykrój na postać i wielkość deformacji zakrytycznych, występujących w warunkach eksploatacji. Zaproponowano metodykę określania alternatywnych rozwiązań konstrukcyjnych szkieletu struktury, zapewniające poprawę trwałości eksploatacyjnej, w oparciu o narzędzia numeryczne. Słowa kluczowe: obciążenia eksploatacyjne, utrata stateczności, ustroje cienkościenne, lotnicze struktury nośne, skręcanie, metoda elementów skończonych, nieliniowe analizy numeryczne, trwałość eksploatacyjna

Introduction
Science and Technology

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