COLLAPSE BEHAVIOUR OF THIN-WALLED CFRP STRUCTURES DUE TO MATERIAL AND GEOMETRIC NONLINEARITIES - EXPERIMENTS AND SIMULATION

摘要

Aerospace industry strives for significantly reduced development and operating costs. Reduction of structural weight at safe design is one possibility to reach this objective. Another one is the use of reliable simulation methods in order to minimize expensive and time consuming experimental design studies. DLR has developed improved concepts and tools for fast and reliable simulation of the buckling and the postbuckling behaviour of thin-walled structures up to collapse, respectively, which allow the exploitation of considerable reserves in primary fibre composite structures in aerospace applications [1-4]. For the validation of these concepts and tools, a sound database of experiments is needed. Such has grown considerably through many recent projects (e.g. EU-"COCOMAT" [5,6], EU-"POSICOSS", ESA- "Probabilistic Aspects of Buckling Knock Down Factors - Tests and Analysis", etc.). The paper presents first the experimental activities at the buckling test facility of the DLR Institute of Composite Structures and Adaptive Systems with an overview about buckling, postbuckling and collapse tests in combination with advanced measurement systems. Secondly, suitable computational methods are presented.