Numerical simulation of the structural behaviour of orthotropically stiffened aircraft panels under short time duration loading

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Numerical simulation of the structural behaviour of orthotropically stiffened aircraft panels under short time duration loading

Bisagni, Chiara / Linde, Peter

This paper presents exemplarily the results of a numerical study of the structural behaviour of orthotropically stiffened aircraft panels subjected to short time duration loading. Focus is placed on a stringer-frame stiffened circular aircraft fuselage panel loaded by different duration load pulses. The simulation of the behaviour under a static load through buckling and the post-buckling regime is presented. The panel's own dynamic characteristics are presented followed by the application of different time pulses. The panel could carry dynamic buckling loads larger than the static buckling loads, provided their duration is very short. If the load duration is longer, the panel may only carry a dynamic buckling load smaller than the static one, which means that taking the static buckling load as the design point for dynamic problems might be misleading. The ratio between the dynamic buckling load and the static buckling load may become of practical interest for the designer, since it provides a direct indication of the load carrying capacity of the structural elements exposed to rapidly applied loads relative to almost statically applied loads.