或る貨物船のウインドラスの破壊原因について
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As the windlass frame of a cargo-ship was broken in a harbor in the course of leaving the shore, we carried out the material test of the anchor chain and the windlass frame including destructive test and strength calculation of the frame, and the measurement of the deformation and the calculation of load on the anchor chain to investigate the causes of its failure. Results of these tests showed that there was no defect in the material of the frame and anchor chains. It could be suspected that there might have been some traces of minor cracks at the fractured surfaces of the frame prior to its failure, but it is highly questionable due to the various opinions regarding its existence. The microstructure of the part of the material which was doubted to be incipient cracks seems to be a little inferior to the other parts. But the starting point of the fracture was not found in that part but in the part which is sound. And from the view point of propagation of the cracks we are sure that the cause of the fracture is not in the materials involved. In the destructive test of the windlass frame the breaking load was found to be 112 tons which coincides both with the results of strength calculation and the measurement of the deformation of the chain links inside the hawse pipe. At the outside of the hawse pipe the load acted on the chain cable was found to be 220〜240 tons considering from the measurement of the deformation of the links and this value is comparatively consistent with the calculation. This load is much larger than the breaking load of 174 tons specified in the AB rule and it is reasonably believed that the anchor chain itself was about to break. According to the above consideration it is within reason to believe that the cause of the trouble lies in some undue large load which acted on the windlass frame. If we make the strength of windlass frame much stronger than chain cable, the breaking of anchor chain would take place prior to the frame failure and it would then be easier to handle the situation. But the windlass frame of any ship today are equipped with almost the same strength for a given requirement and we don't believe that the frame of this particular ship was especially weak in comparison with other ships.
- 社団法人日本船舶海洋工学会の論文
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