Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7175005 | International Journal of Pressure Vessels and Piping | 2018 | 8 Pages |
Abstract
Notched thermal mechanical fatigue (TMF) of a directionally solidified (DS) superalloy applied for turbine blades has been studied experimentally and numerically. The test results, failure analysis, constitutive model and life prediction method of the notched superalloy were presented. Two types of notched specimens with the theory stress concentration (Kt) of 1.5 and 2 were designed. The temperature applied to the specimens ranged from 500 to 1000â¯Â°C. With a developed constitutive model for TMF, the cyclic stress and strain responses at the notches were analyzed. The dominated damage area which was defined as 1â¯mm zone was identified with the basis of the scanning electron microscope (SEM) observations as well as the finite element analysis results. Finally, an averaged stress based life model corresponding to the damage process zone was proposed with good accuracy to prediction TMF lives with or without notches.
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Authors
Xiaoan Hu, Gaole Zhao, Xiaoguang Yang, Duoqi Shi,