Fatigue strength of machined screw thread. Effects of loading modes in fatigue test.

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  • 機械各部締結用切削ねじの疲労に関する研究　　繰返し負荷方法の影響
  • キカイ カクブ テイケツヨウ セッサク ネジ ノ ヒロウ ニ カンスル ケンキ

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Abstract

The effects of various kinds of factors on the fatigue strength of machined screw thread connection generally used as the fastener of machine components are examined. Effects of materials (i. e. heat-treatment), fastening force, yielding pre-tension or pre-compression before the oscillating loading test and lubrication between the connecting surfaces are chosen as the factors. Fatigue tests are performed for both types of screw thread, and bolt-nut connections made of normalized or tempered S 45 C, and obtained results are investigated in detail. Consequently, the effects on the fatigue strength are clarified. Furthermore, the strain hardening caused at each step of the machining and loading process is discussed.

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