The design of welded structures is mostly based on guidelines and rules, suggesting simplified procedures based on tests carried out on standard structural details. Such S-N curves procedures are a practical tool for the evaluation of the fatigue strength of a ship structural detail. The basic assumption of them is that the captioned detail has the same fatigue behavior of a class of standard details. The reference structural details presented by the guidelines are necessarily limited. From this point of view designers are implicitly driven to use mainly standard structural solutions. A way to generalize fatigue strength assessment is the adoption of a local approach, which requires the determination of the stresses in way of the crack starting location to be compared with their critical value at a given cycles number. In this paper different finite element techniques have been used and compared in evaluating the stress concentration factors. A calibration of finite element techniques is achieved involving knowledge of parameters sensitivity based on the experimental results of a typical ship structural detail tested in the Ship Structures Laboratory of DINAV.
Finite element procedures for fatigue assessment of ship structural details
BOOTE, DARIO;RIZZO, CESARE MARIO;TEDESCHI, RODOLFO;
2003-01-01
Abstract
The design of welded structures is mostly based on guidelines and rules, suggesting simplified procedures based on tests carried out on standard structural details. Such S-N curves procedures are a practical tool for the evaluation of the fatigue strength of a ship structural detail. The basic assumption of them is that the captioned detail has the same fatigue behavior of a class of standard details. The reference structural details presented by the guidelines are necessarily limited. From this point of view designers are implicitly driven to use mainly standard structural solutions. A way to generalize fatigue strength assessment is the adoption of a local approach, which requires the determination of the stresses in way of the crack starting location to be compared with their critical value at a given cycles number. In this paper different finite element techniques have been used and compared in evaluating the stress concentration factors. A calibration of finite element techniques is achieved involving knowledge of parameters sensitivity based on the experimental results of a typical ship structural detail tested in the Ship Structures Laboratory of DINAV.
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