The authors validate a macro-element model of the post-buckling behavior of a stiffened metal airplane frame. They then compare the accuracy and calculation cost of a 476-regular-element model with the new model, which employs 300 elements. They found the 300-element model to be much more representative of the frame's structural behavior. In fact, inaccuracy in calculating the critical load was reduced from 20 to under 5 percent. Computation time for a 20-mm crash analysis was cut in half (180 CPU hours for the 476 regular elements and 90 CPU hours for the 300-element model). Furthermore, the authors estimate that once the model is integrated into a cylindrical commercial airplane structure with only four frames, it will allow a gain of nearly 700 CPU hours per crash calculation using an IBM/9221 with 24 Mb of central memory and CPU of 3.2 Mflops.
Crash des Avions sur Piste: Validation et Evaluation Finale de la Methodologie de Modelisation d'une Structure de Cadre Avion (Runway Plane Crashes: Validation and Final Assessment of the Methodology for Modeling an Airplane Frame)
1991
60 pages
Report
No indication
English
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