The main objective of the present research is to develop a number of tools for the numerical simulation of crack behavior in pressurized fuselages. In these calculations the geometrically nonlinear effects described above and the influence of stiffening components on the crack behavior will be taken into account. Since the flapping phenomenon that is observed in experiments on pressurized aircraft fuselages with initially longitudinal cracks is not yet well understood, a major goal of the present research is to simulate crack flapping numerically and to predict whether a crack will flap and at what crack length. In real structures there will always be a plastic zone around the crack tip. However, the behavior of such 'real' cracks is still believed to be dictated by a number of linear elastic crack tip parameters. Therefore in our research we will assume that linear-elastic fracture mechanics conditions hold and that the state of stress around the crack tip is characterized by these linear-elastic crack tip parameters.
Numerical Simulation of Crack Growth in Pressurized Fuselages
1994
216 pages
Report
Keine Angabe
Englisch
Aircraft , Transportation Safety , Air Transportation , Structural Mechanics , Fuselages , Crack propagation , Structural failure , Finite element method , Computerized simulation , Aircraft structures , Theses , Failure modes , Computational grids , Elastic properties , Stiffness , Cracking(Fracturing) , Fracture(Mechanics) , Fatigue(Mechanics) , Nonlinear systems , Crack tips , Foreign technology , Pressurized fuselages
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