Fatigue crack growth is studied in welded, stiffened panels through the use of analytical, numerical, and experimental means. Full scale testing is conducted by integrating welded, stiffened panels into a box girder configuration subjected to cyclic fatigue loading. Analytical modeling is performed based on of superposition of linear elastic fracture mechanics, assuming a worst-case residual stress field representation. Numerical modeling is performed using finite element models, with temperature gradients simulating residual stresses, to calculate the J-Integral around the crack tip at different stages of crack development, and transforming the results into a propagation rate prediction. An initial crack is introduced and crack propagation behavior is observed, noting variations due to interaction with the inherent residual stress field of welded stiffeners. The two modeling techniques are compared in their ability to predict worst-case crack growth rates and correlated with experimental results
One new wheel and two used wheels (one with a thermal crack in the tread) were examined for mechanical properties, macrostructure, microstructure, and...
John A. Volpe National Transportation Systems Center (U.S.) ...
1999-02-01
Abstract:
The handbook is presented in two volumes. Volume I introduces the damage tolerance concept with an historical perspective followed by the fundamentals...
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