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Fatigue Life Prediction and Ratcheting behavior of the Elbrodur-NIB under Fatigue loading with mean stress

평균응력을 포함한 피로하중 하에서 Elbrodur-NIB의 피로수명예측 및 Ratcheting 거동

  • 임창범 (국방과학연구소 대함체계단)
  • Received : 2011.05.11
  • Accepted : 2011.06.20
  • Published : 2011.07.01

Abstract

An experimental study was carried out for the Elbrodur-NIB(copper alloy) at room temperature under stress-controlled uniaxial fatigue loading with and without mean stress. As a result, the effects of stress amplitude, mean stress and stress rate on ratcheting behavior were investigated. The ratcheting strain increased with increasing stress amplitude for a given mean stress, and with mean stress for a given stress amplitude. But, the ratcheting strain decreased as the stress rate increased. The three mean stress models were investigated and the mean stress models of Smith-Watson-Topper and Walker yielded good correlation of fatigue lives in the life range of $10^2-10^5$cycles.

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