[논문]On the effects of hull-girder vibration upon fatigue strength of a Post-Panamax container ship disaggregated by short-term sea state

Fukasawa, Toichi; Mukai, Keiichi

doi:10.2478/ijnaoe-2013-0190

On the effects of hull-girder vibration upon fatigue strength of a Post-Panamax container ship disaggregated by short-term sea state 원문보기

International journal of naval architecture and ocean engineering, v.6 no.2, 2014년, pp.431 - 441

Fukasawa, Toichi (Osaka Prefecture University) , Mukai, Keiichi (Osaka Prefecture University)

Abstract ▼ AI-Helper

The effects of hull-girder vibration on the fatigue strength of a Post-Panamax container ship are discussed in the present paper. Firstly, the short-term sea states are categorized according to the occurrence probability of each sea state. Time histories of hull-girder stress in short-term sea states are calculated by means of a nonlinear simulation code of ship response assuming that the hull-girder is rigid and flexible. Then, the calculated stress peaks are processed by the rainflow counting method, where two different counting procedures are used based on the considerations of crack propagation behaviors. Finally, the fatigue damage in life time of the ship in each categorized short-term sea state is estimated by means of Miner's rule. Based on the calculated results, the effects of hull-girder vibrations on the fatigue damage are clarified by disaggregated damage from short-term sea state.

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대상 데이터

A Post-Panamax type container ship is used in the study, of which particulars are L × B × D - d = 280.0m × 42.8m × 24.5m - 14.20m.

성능/효과

(1) If the ship is assumed to encounter 100,000 sea states according to the occurrence probability of the short-term sea state given in the IACS North Atlantic wave scatter diagram, the total cumulative fatigue damage factor is almost unity in the case where the ship’s hull is assumed to be rigid.
(4) The stress range around 100MPa has a significant effect on the fatigue damage in the present ship, and a peak can be seen in the fatigue damage factor around the stress range of 100MPa. It is important to confirm whether this phenomenon can be observed or not in the actual fatigue damage of a ship taking account of the nonlinearity in crack initiation/propagation behavior.
5s are shown in Fig. 4. The generated stress range is mostly below 100 MPa in this case, and the fatigue damage factor is increasing with the increase of the stress range. On the other hand, the histograms of the hull-girder stress range and the corresponding fatigue damage factors in the short-term sea states of significant wave height Hs = 13.
5s are shown in Fig. 5. The stress range over 100MPa is frequently observed in this case, and the fatigue damage factor has a peak around the stress range of 100 MPa. This is interprettable as the effects of the abovementioned stress range of 100MPa shown in Fig.
, 2012; Sumi, 2012). According to the results of such research works, the smaller amplitude component of higher frequency superposed on the larger amplitude component of lower frequency has not significant effect on the fatigue damage, but only the enlargement effect of the total amplitudes of the superposed stress is effective. This means that the smaller amplitude component of stress range does not affect the fatigue strength so much even if the number of cycles is large, but the enlargement effect in stress range by the smaller amplitude component of higher frequency is important in the fatigue strength.

후속연구

(7) The crack initiation and propagation behaviors are nonlinear phenomena and there may be some limitation in the application of Miner’s rule to estimate the fatigue damage precisely. Further investigation would be necessary to clarify the effect of hull-girder vibration upon the fatigue strength of a ship by taking account of stress histories which is effective in the crack initiation and propagation as well as the mean stress effect due to still water bending moment.
The crack initiation and propagation are nonlinear phenomena and there may be some limitation in the application of Miner’s rule to estimate the fatigue damage precisely, because Miner’s rule is based on the linear cumulative law. Including the behavior of fatigue damage factor around 100MPa stress range, further investigation would be necessary to clarify the effect of hull-girder vibration upon the fatigue strength of a ship by taking account of stress histories which is effective in the crack initiation and propagation. Hasty conclusions obtained by Miner’s rule by using only the load histories leads sometimes to misunderstandings on the fatigue strength of a ship.

참고문헌 (11)

Derbanne, Q., Rezende, F., de Hauteclocque, G. and Chen, X.B., 2011. Evaluation of rule-based fatigue design loads associated at a new probability level. Proceedings 21st International Offshore and Polar Engineering Conference, ISOPE 2011, Maui, Hawaii, USA, 19-24 June 2011, pp.929-935.
Fukasawa, T., 2012. Some Considerations on the effect of wave-induced vibrations upon hull-girder fatigue strength of a Post-Panamax container ship. Hydroelasticity in Marine Technology, Hydroelasticity 2012, Tokyo, Japan, 19-21 September 2012, pp.389-398.
Fukasawa, T., Kawabe, H. and Moan, T., 2007. On extreme ship response in severe short-term sea state, Advancements in Marine Structures. 1st Int. Conf. on Marine Structures, Advancement in Marine Structures, MARSTRUCT 2007, Glasgow, UK, 12-14 March 2007, pp.33-40.
Gotoh, K., Matsuda, K. and Kitamura, O., 2012. Numerical simulation of fatigue crack propagation under superposed loading histories with two different frequencies. Hydroelasticity in Marine Technology, Hydroelasticity 2012, Tokyo, Japan, 19-21 September 2012, pp.287-297.
Nippon Kaiji Kyokai, 2003. Guidelines for container carrier structures. Chiba Japan: ClassNK.
Kitamura, O., Sugimura, T., Nakayama, S. and Hirota, K., 2012. A study of the results of fatigue crack propagation tests under combination loads of high & low cycles -Consideration to the effect of whipping on the fatigue strength-, 2012SOS1-4. Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers, Japan, 17-18 May 2012, pp.13-16.
Maddox, S.J., 1991. Fatigue strength of welded structures. Cambridge, UK: Abington Publishing.
Matsuda, K., Takahashi, H. and Gotoh, K., 2011. Numerical simulation of fatigue crack propagation under variable amplitude loading with different frequency components. 25th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures, TEAM 2011, Incheon, Korea, 26-29 September 2011, pp.736-742.
Matsuishi, M. and Endo, T., 1968. Fatigue of metals subjected to varying stress. Proceedings Kyushu Branch, Japan Society of Mechanical Engineers, March 1974, pp.37-42.
Sumi, Y., 2012. The effect of slam-induced whipping stress for fatigue crack growth under random seaway loading, 2012SOS1-3. Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers, Kobe, Japan, 17-18 May 2012, pp.9-12.
Yamamoto, Y., Fujino, M. and Fukasawa, T., 1983. Longitudinal strength of ships in rough seas. Technical Bulletin of Nippon Kaiji Kyokai, 1, pp.1-12.

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On the effects of hull-girder vibration upon fatigue strength of a Post-Panamax container ship disaggregated by short-term sea state 원문보기

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On the effects of hull-girder vibration upon fatigue strength of a Post-Panamax container ship disaggregated by short-term sea state 원문보기

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