【作者】

Tomoya Shinozaki

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。In the forged crankshafts for diesel engines, there inevitably exist non-metallic inclusions which have been generated in the steel making and casting process of large ingot. It is generally known that fatigue cracks frequently initiate from inclusions especially for high strength steel. The design fatigue strength of crankshafts, however, is defined only by the tensile strength of used steel grade in accordance with such as IACS UR M53, so that it has adequate safety margin even if crankshafts contain large size inclusions in the steel. Nowadays, the remarkable progress in steel making technology has enabled manufacture of “clean steel”, which contains a lower number of and a smaller size of inclusions. A higher design fatigue strength could conceivably be applied to such clean steel by clarifying the effect of inclusion size on the fatigue strength of crankshafts. Therefore, the following are discussed in this study. (1) To estimate the relationship between the fatigue strength and the maximum inclusion size in the crankshaft. (2) To confirm that this relationship is valid to the full scale of crankshafts. (3) To estimate the fatigue strength under multiaxial loading of axial and torsion to them in the operating condition taking inclusion size into account.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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