Closed-Form Methodology for the Structural Analysis of Composite Plates With Cutout

• Autores: Daniel Pastorino Junquero
• Directores de la Tesis: Antonio Blázquez Gámez (dir. tes.), Federico Paris Carballo (dir. tes.)
• Lectura: En la Universidad de Sevilla ( España ) en 2021
• Idioma: inglés
• Número de páginas: 260
• Enlaces
  • Tesis en acceso abierto en: Idus
• Resumen

  • The use of composite materials in the aerospace industry shows an increasing tendency due to its excellent specific mechanical properties. The long fibre reinforced polymers are well suited for its application in plate and shell structures. These structures are commonly weakened by cutouts of different shapes, which provide access to the internal systems and structures, allow system integration, or simply reduce the weight of the structure. These cutouts lead normally to a concentration of stresses around them, that requires a thoroughly analysis in order to provide an optimum design of the component. To this end, it is usual to perform a structural analysis on the basis of the methodologies in the existing literature: FEM, BEM and closed-form formulations. The closed-form formulations provide a simple and powerful tool for the first phases of the component's design, considering that they are well suited for the resolution of parametric analyses with a competitive amount of computational power compared to FE methodologies. However, these formulations have a limited application, since they rely on a set of hypotheses that should be taken into account, e.g. analytical formulations are solved by assuming that the plate under study is infinite in comparison with the cutout. The main objective of the present dissertation is to develop a closed-form formulation that allows the stress analysis of composite panels with cutouts, and that simulates as detailed as possible the real features that are found in aeronautical parts. In this regard, the formulation must allow, among other features, the introduction of local reinforcements, non-uniform lay-ups over the panel, and the inclusion of stiffeners.