Low Cycle Fatigue Estimation Based on the Critical Distance Stress Theory

Abstract:

Generally the critical distance stress theory was applied for the fatigue limit estimation of general structures using fatigue limit of smooth specimen (σ_w0), and threshold stress intensity factor range (K_th). In this paper we extended this method for the estimation of low cycle fatigue life too. In this method we define the critical distance (r_c) on static strength conditions, which is calculated using ultimate tensile strength (σ_B) and fracture toughness (K_IC), in addition to the critical distance on fatigue limit condition (r_c). Then the critical distances of any low cycle fatigue conditions can be calculated by interpolation of critical distance on fatigue limit (r_c) with critical distance on static strength (r_c). By unifying these low cycle fatigue life estimation method with high cycle fatigue limit estimation method we can estimate the full range fatigue life easily. And to confirm the availability of this estimation method we perform the fatigue test for any stress concentration specimens.s

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 1773-1778
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.1773
• Online since: March 2014
• Authors: Toshio Hattori*, Muhammad Amiruddin Bin Ab Wahab, Minoru Yamashita
• Keywords: Critical Distance Stress Theory, Fatigue Life, Fracture Toughness, High Cycle Fatigue (HCF), Low Cycle Fatigue, Threshold of Stress Intensity Factor Range

References

[1] Taylor, D., Geometrical Effects in Fatigue: A Unifying Theoretical Model, Int. J. Fatigue, 21, 413-420 (1999).

DOI: 10.1016/s0142-1123(99)00007-9