The Fatigue Fracture Progress of Valve Springs

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  • 弁ばねの疲労破壊の進展
  • ベンバネ ノ ヒロウ ハカイ ノ シンテン

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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:<br>(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.<br>(2) On non-electropolished spring, the depth of initial cracks has certain critical values, which probably depend on applied stress.<br>(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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