繰り返し応力による累積疲れ損傷の概念と管端スピニング加工に対するその応用

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  • Review of a concept of cumulative fatigue damage under various repeated loads and an application of this concept for the experimental tube end spinning
  • クリカエシ オウリョク ニ ヨル ルイセキ ツカレ ソンショウ ノ ガイネン ト カン タン スピニング カコウ ニ タイスル ソノ オウヨウ

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The phenomenon of cumulative fatigue damage under various repeated loads have been investigated by many reporters. The purpose of this paper is to present a simple theoretical concept of fatigue damage that is shown in reports and literatures and introduce this concept to predicting workabilities for the experimental tube end spinning. On the tube end spinning process, the material encountered with (i) Cyclic lateral bending at relief areas of the shaping die and (ii) Cyclic heating by friction, so the tube end spinnability of any metal would be affected by cumulative damage fatigue under cyclic lateral bending, strain-rate and forming temperature.

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