Thermal fatigue (TF) cracks often initiate and propagate at the edge of holes, which leads to the failure of blades [5, 6]. Therefore, understanding the crack initiation and propagation around the cooling holes during thermal cycles provides important information for Low-Cycle Thermal Fatiguethermal fatigue cracks initiate and grow to readily detectable proportions. Pressure vessel and piping components in the electric power industry also must be designed to resist thermal fatigue cracking. This is done at great expense, because the consequences of suffering low-cycle thermal fatigue crack-
- The 3 Stages of Fatigue Failurein OperationsThe S-N CurveForms of FatigueReferencesRelated TopicsTopic ToolsInfluence of High Cycle Thermal Loads on Thermal Fatigue May 01, 1997 · Thick thermal barrier coating systems in a diesel engine experience severe thermal Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF) during engine operation. In the present study, the mechanisms of fatigue crack initiation and propagation, as well as of coating failure, under thermal loads which simulate engine conditions, are investigated using a high power CO2 laser.
Mechanisms of Fatigue Crack Initiation and GrowthJul 02, 2014 · Fatigue crack initiation at an inclusion Cyclic slip steps (PSB) Fatigue crack initiation at a PSB. FCP 12 Effects of strength and ductility 0.001 0.01 0.1 1 determines the behavior of the fatigue crack, i.e.. Stage I and Stage II behavior. FCP 17 Stage I crack growth Single primary slip system individual grain near - tip plastic zone S S
Numerical simulation of thermal fatigue behavior in a the thermal fatigue crack propagation . Others used cyclic J integral [37,38] and strain intensity factor [3235,39,40] for char-acterizing thermal fatigue crack propagation. Most researchers deal with thermal fatigue as a special case of isothermal fatigue.
Aug 29, 2018 · That is, the thermal crack initiation and propagation are two important stages of thermal fatigue crack growth. Xiao xuan et al [ 18] studied the thermal fatigue behavior of three different superalloys. The results show that the thermal crack propagation mode of the alloy changes with the increase in temperature.Fatigue crack initiation and propagation behavior of Apr 15, 2021 · The strain fatigue crack initiation and propagation mechanism of Alloy 690TT SG tube is studied by combining experiment with numerical simulation, and the influence of shape factor and secondary crack on micro fracture mechanism is analyzed, which provide effective data and reliable theoretical basis for fatigue design of this kind of nuclear power SG tube.