ばね論文集
Online ISSN : 1348-1479
Print ISSN : 0385-6917
ISSN-L : 0385-6917
弁ばねの疲労破壊の進展
山本 進山尾 憲人小林 智
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ジャーナル フリー

1996 年 1996 巻 41 号 p. 7-11

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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.

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