タフピッチ銅平板の変動応力下の疲労寿命推定法の検討

概要

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In spite of the tough pitch copper material is used for the many kinds of conductors of electrical machining devices, the fatigue phenomenon of the tough pitch copper material does not still clarify under variable stresses considering to a service loading. Then, constant stress amplitude fatigue tests were carried out for the tough pitch copper sheet material and then the fatigue life under variable stresses were predicted by Miner's law using constant stress tests results as shown S-Ndiagram. The program fatigue tests consist of two steps and multifold stress levels were carried out for tough pitch copper sheet specimens compared with the fatigue lives predicted by using Miner's law. As it was clear that the fatigue lives predicted by using Miner's law were shorter than the experimental program fatigue lives under variable stresses in service loading, so new practical diagram modified from original S-N diagram was proposed. The fatigue lives predicted by using new S-N diagram coincide with experimental fatigue lives under variable stress consist of two or three step and multifold stress levels.
社団法人日本機械学会の論文
2000-11-25