Fractgraphy on Fatigue Fractore of Wire Springs

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  • 線ばねの疲労破壊起点部の特徴について
  • センバネ ノ ヒロウ ハカイ キテンブ ノ トクチョウ ニ ツイテ

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Abstract

This paper describes the features of fatigue fracture of coil spring fractured in a fatigue test or actual use through the observation with an electron microscope.<br>The starting point of fatigue fracture of silicon chrome steel wire and piano wire for the valve spring fractured in a spring fatigue test is classified into the following three forms.<br>a. Fracture form with fish eye where the starting point of fatigue fracture is on non-metallic inclusion.<br>b. Fracture form where an initial crack of shear type exists on the starting point of fatigue fracture.<br>c. Fracture form where an initial crack of tension type is caused on the starting point of fatigue fracture.<br>The paper also describes the features of fracture caused by surface flaw, fretting damage insufficient shot peening, decarburization and corrosion in actual use.

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