Fatigue Strength and Life Estimation Methods Using Critical Distance Stress Theory

Abstract:

Generallythe critical distance stress theory was applied for the fatigue limitestimation of general structures. In thismethod, it needs only two parameters, fatiguelimit of smooth specimen (σ_w0), and threshold stress intensityfactor range (∆K_th). In this paper we extended this method for theestimation of low cycle fatigue lifetoo. In this improvement wedefine the critical distance (r_c’) on static strength conditions,which is calculated using ultimate tensile strength (σ_B) andfracture toughness (K_IC), in addition to the critical distance onfatigue limit condition (r_c). Then the critical distances of any lowcycle fatigue conditions can be calculated by interpolation of criticaldistance on fatigue limit (r_c) with critical distance on staticstrength (r_c’). By unifying these low cycle fatigue life estimationmethod with high cycle fatigue limit estimation method we can estimate the fullrange fatigue life easily. And to confirm the availabilityof this estimation method we perform the fatigue test for circlehole specimens, sharp V notch specimens andfretting fatigue specimens.

• Periodical: Advanced Materials Research (Volumes 694-697)
• Pages: 853-863
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.694-697.853
• Online since: May 2013
• Authors: Muhammad Amiruddin Bin Ab Wahab, Niu Jie, Toshio Hattori, Minoru Yamashita
• Keywords: Critical Distance Stress Theory, Fatigue Life, Fracture Toughness, High Cycle Fatigue (HCF), Low Cycle Fatigue, Threshold of Stress Intensity Factor Range

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