FATIGUE ANALYSIS OF A SHIP DECK
Abstract
The predicted lifespan of the ship deck can be confirmed by navigational exploitation, structural imperfections and geometry are sources of excitation in the vertical and longitudinal direction and have a decisive influence on the structure's vibration levels and implicitly on the evolution over time as a random signal of specific deformations and stresses respectively.
For the static calculation, the maximum stresses σ were obtained from 536.57 MPa, 500.15 MPa and 481.92 MPa for the analyzed cases: with right angle, connection radius R=0.5 m and R=1 m. The recommended construction method is definitely the one in which the connection radius R=1 m.
For the fatigue calculation, a wear factor of 0.6118, 0.5368 and 0.5170, respectively, was obtained because it was considered the worst case where the cuts in the ship deck do not have a stiffening bracket that directly affects the stress, displacement and wear factor. Stresses in the rest of the deck are below the critical limit. Due to the studied case, a life expectancy of about 1.92 years, 2.20 years and 2.28 years is estimated, after which cracks can occur in the area of cuts.
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