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Fatigue life assessement of engine lateral supports (CROSBI ID 467676)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Domazet, Željko ; Barle, Jani ; Đukić, Predrag Fatigue life assessement of engine lateral supports // 15th Symposium "Danubia-Adria" / Freddi, Alessandro (ur.). Bolonja: DIEM - Bologna, 1998. str. 105-106-x

Podaci o odgovornosti

Domazet, Željko ; Barle, Jani ; Đukić, Predrag

engleski

Fatigue life assessement of engine lateral supports

Fatigue failures of the main engine lateral supports (top engine bracing) of several bulk carrier vessels have been analyzed. Failures occurred after a few months of service. In order to solve the problem and avoid future time and money losses, it was necessary to establish main causes of failures. The strain gage measurements were performed in large scale during the sea trial. Possible reasons for these fatigue failures are: - loads are higher than one used for design of supports, - weldments are not correctly manufactured, - design of supports is inadequate. To obtain operational loads (axial force and the bending moments) strain gages were installed on each beam (1÷5 on Fig. 1.). The significant difference of measured axial forces between supports was discovered. One of the beams was loaded with approx. 50% lower load than the others. However, maximal axial force (20kN) was within a range of design load values. Measurements gave no significant bending moments. Stresses at the crack initiation points were measured to describe the quality of design. Strain gages 6÷8 were used for extrapolation of maximal stresses. Typical time record of measured local stresses is shown in Fig.2. The values of maximal stresses at the end of the weld are extrapolated, Fig. 3. According to [1], and to the determined maximal stresses it is possible to predict the fatigue life of approx. 5ˇ106 cycles, or a few weeks of service. This service life is too short, compared with expected 20 years. This prediction is in good agreement with the time to failure observed on former failures. Failures are mainly caused by inadequate design, of the joint of support and ship (hull) structure from one side, and insufficient weld quality.

Fatigue cracks; engine lateral support; hot-spot stresses

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Podaci o prilogu

105-106-x.

1998.

objavljeno

Podaci o matičnoj publikaciji

15th Symposium "Danubia-Adria"

Freddi, Alessandro

Bolonja: DIEM - Bologna

Podaci o skupu

15th Symposium "Danubia-Adria" on Experimental Methods in Solid Mechanics

predavanje

30.09.1998-03.10.1998

Bertinoro, Italija

Povezanost rada

Strojarstvo