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The influence of temperature on the course of fatigue damage cumulation of P91 steel
This paper presents low-cycle fatigue test results of P91 steel. Tests were performed for two temperatures T = 20 °C and T = 600 °C. The tests were performed under constant-amplitude and under programmed loadings. In both cases the occurrence of cyclic softening without a distinct period of stabilization was found. Moreover the influence of temperature on fatigue life was found and it depends on the strain level and is the highest for the lowest strain levels. Furthermore the influence of the program type on the test results and fatigue life calculations was found. Based on the performed analysis of the test results conclusions were formulated as follows: (1) P91 steel is a material which cyclically softens in the temperature of 20 and 600 °C during LCF tests. (2) Temperature and level of total strain influence the size of changes of cyclic properties. At the temperature of 600 °C the size of the changes is definitely larger than at the temperature of 20 °C. (3) Fatigue life of steel is influenced by both the level of total strain and the test temperature. The influence of the temperature depends on the level of total strain and is low at high levels of total strain and increases with lowering the level of total strain. (4) The emerged changes of cyclic properties (hysteresis loop parameters) and lack of clear stabilization period in the temperature of 20 and 600 °C make it difficult to determine basic material data. Their values depend on the period of fatigue life which is assumed oneself. Assuming half of fatigue life it only reflects momentary properties from this period of fatigue life. (5) Experimental verification of the Palmgren-Miner hypothesis revealed that the load history and test temperature influence the effectiveness. With the temperature increase the effectiveness of the hypothesis decreases slightly.
The influence of temperature on the course of fatigue damage cumulation of P91 steel
This paper presents low-cycle fatigue test results of P91 steel. Tests were performed for two temperatures T = 20 °C and T = 600 °C. The tests were performed under constant-amplitude and under programmed loadings. In both cases the occurrence of cyclic softening without a distinct period of stabilization was found. Moreover the influence of temperature on fatigue life was found and it depends on the strain level and is the highest for the lowest strain levels. Furthermore the influence of the program type on the test results and fatigue life calculations was found. Based on the performed analysis of the test results conclusions were formulated as follows: (1) P91 steel is a material which cyclically softens in the temperature of 20 and 600 °C during LCF tests. (2) Temperature and level of total strain influence the size of changes of cyclic properties. At the temperature of 600 °C the size of the changes is definitely larger than at the temperature of 20 °C. (3) Fatigue life of steel is influenced by both the level of total strain and the test temperature. The influence of the temperature depends on the level of total strain and is low at high levels of total strain and increases with lowering the level of total strain. (4) The emerged changes of cyclic properties (hysteresis loop parameters) and lack of clear stabilization period in the temperature of 20 and 600 °C make it difficult to determine basic material data. Their values depend on the period of fatigue life which is assumed oneself. Assuming half of fatigue life it only reflects momentary properties from this period of fatigue life. (5) Experimental verification of the Palmgren-Miner hypothesis revealed that the load history and test temperature influence the effectiveness. With the temperature increase the effectiveness of the hypothesis decreases slightly.
The influence of temperature on the course of fatigue damage cumulation of P91 steel
Der Temperatureinfluss im Zuge der Ermüdungsschädigungsakkumulierung von P91-Stahl
Mrozinski, S. (author) / Shocki, R. (author)
2013
6 Seiten, 7 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
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