The principle of fatigue strength assessment consists in comparing stresses with their critical values as a function of number of cycles to failure. Stresses are mainly given by theoretical means, whereas the critical values, i.e. number of cycles to failure, are mainly based on experimental results. Taking into account that local stress assessment needs complex numerical simulations (e.g. finite elements or crack propagation methods) and moreover fatigue tests aren’t always costs effective, they must live together with simplified fatigue life prediction methods. Nevertheless both complex calculations and simplified methods should be calibrated by the comparison with experimental data. Three robust fatigue assessment approaches to predict the fatigue behavior of welded structures, are presented and the results are discussed on the light of experimental data coming from a series of fatigue tests still under course in the Ship Structures Laboratory of the Dipartimento di Ingegneria Navale e Tecnologie Marine (DINAV) on a particular ship structure detail: an ordinary Tsection stiffener intersecting a deep web girder.
Fatigue of a typical structural detail: comparison between test results and simplified local approaches
RIZZO, CESARE MARIO;TEDESCHI, RODOLFO
2003-01-01
Abstract
The principle of fatigue strength assessment consists in comparing stresses with their critical values as a function of number of cycles to failure. Stresses are mainly given by theoretical means, whereas the critical values, i.e. number of cycles to failure, are mainly based on experimental results. Taking into account that local stress assessment needs complex numerical simulations (e.g. finite elements or crack propagation methods) and moreover fatigue tests aren’t always costs effective, they must live together with simplified fatigue life prediction methods. Nevertheless both complex calculations and simplified methods should be calibrated by the comparison with experimental data. Three robust fatigue assessment approaches to predict the fatigue behavior of welded structures, are presented and the results are discussed on the light of experimental data coming from a series of fatigue tests still under course in the Ship Structures Laboratory of the Dipartimento di Ingegneria Navale e Tecnologie Marine (DINAV) on a particular ship structure detail: an ordinary Tsection stiffener intersecting a deep web girder.
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