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The crack opening behavior of a fatigue crack in a centrally cracked panel was studied using a discretized version of the Dugdale and Barenblatt model. The effect of crack growth was also included. Results obtained for constant amplitude loading were in agreement with data reported in the open literature. The effect of application of single overload-underload combinations and of simple block loading programs on the crack opening behavior were analyzed. The results were compared with predictions based on an existing empirical model (CORPUS). In this way the criteria used in the CORPUS model to select significant load excursions in the applied load sequence were checked. Finally, both models were used to predict crack growth under a simplified landing gear load sequence. The predicted crack opening loads and the crack growth lives were in agreement with experimental data.
crack propagation, crack closure, plastic deformation, plastic zone, cyclic loads, stress analysis, retardation, fatigue life, predictions, crack opening model, crack growth model
de Koning, AU
Research engineer, National Aerospace Laboratory, NLR, Marknesse,
Research assistantstructural engineer, Twenty University of TechnologyFokker Space and Systems B.V., EnschedeAmsterdam,