プロペラ軸の腐蝕疲労について(その2) : 曲げ疲労による折損

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概要

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• The author has studied in this time propeller shaft damage due to repeated bending stress in which fractures take place perpendicular to the shaft axis.There are two kinds of fracture in the bending failure, one usually occurs in way of the large end of the propeller shaft cone, having flat and smooth fatigue surface with clearly visible beach marks, and the other at the location of the shafts where stress concentration and sea water corrosion exist. In the latter damage, the fracture shows the typical appearance of corrosion fatigue.Although it is believed that the damage in way of the large end of the propeller shaft cone is due to a lack of endurance strength, the reason is not yet completely explained.Among several factors which may influence the reduction of the endurance strength of the shafts, the author has studied following two important problems.(1) Sea water corrosion.After the careful study of several damaged shafts, the author has found the evidence of penetrating sea water in way of the large end of the propeller shaft cone through gum packing ring.So, he has tested small steel specimens subjected to the repeated bending stress and the corrosion of sea water as in the case of the former repeated torsional tests and found that the endurance strength falls to 3.0 Kg/mm^2 for 10^8 reversals and cracks similar to those found on the actual shafts also generates on the surface of specimens.(2) Low Charpy value of shaft steels in service temperatures.The author has studied V-notch Charpy values in various temperatures for several damaged shafts and found the results as mentioned in Fig. 19. No studies has been made of the effect of low temperatures on the endurance strength of the shaft steel, however, it is suggested that such a study may bear results similar to those obtained from the study of the variation of notch sensitivity with temperature under gradually loads.

• 社団法人日本船舶海洋工学会の論文

著者

• 原 三郎

  日本海事協会

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