弁ばねの疲労破壊の進展
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概要
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By using new technique which enables us to measure the depth of initial fatigue cracks in springs, the mechanism of fatigue on engine valve springs was made clear:(1) The initial cracks on non-electropolished springs start from the surface of wire. By contraries, on electropolished springs, they start from inside of wire.(2) On non-electropolished spring, the depth of initial cracks has certain critical values, which probably depend on applied stress.(3) When the initial crack on non-electropolished springs reaches the critical depth, failure occurs suddenly. On the other hands, when the initial crack on electropolished springs comes to surface, sudden failure takes place.
- 日本ばね学会の論文
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