Theoretische und algorithmische Beitraege zur Berechnung von Faserverbundschalen

This work presents a method for the static analysis of thinwalled composite structures. With respect to the special material properties of brittle fiber-composite-laminates it is possible to consider discrete delamination failure. This failure mode has a major impact on the maximal load of lightweight structures and therefore plays a central role in the design and inspection process, especially in combination with stability failure. Beside a priori existing delaminations also onset, propagation and arrest of delaminations can be analysed within an algorithm which involves topology changes of the structural system. The analysis of anisotropic structures is carried out within a hierarchical shell model under assumption of one-director or multi-director kinematics. Special focus is layed on the formulation of a failure criterion appropriate to delamination problems. This works out as a combined criterion of a stress-based and an energy-based part which are both necessary. Finally an adequate algorithm for automated structure calculations including delaminations within the FEM is presented. Examples illustrate the applicability and effectivity of these formulations. (orig.)SIGLEAvailable from TIB Hannover: RN 2767(2000,3)+a+b / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman