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Title: Creep fatigue analysis of a nickel superalloy over the range 750-1040°C
Author: de Abreu e Antunes, V. T.
ISNI:       0000 0004 2694 2872
Awarding Body: Cranfield University
Current Institution: Cranfield University
Date of Award: 1979
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After the review of the predictive methods in the high temperature fatigue field the characterization of the low cycle fatigue behaviour of a nickel superalloy, MARM002, is carried out using one of those predictive methods, the Strainranqe Partitioning method. The basic concepts and procedures of this method are reviewed and applied to MARM002 over the range 750° - 1040°C. These procedures involved the determination of the four basic life relationships at 850°C and 1040°C and their use in conjunction with a damage rule were then employed to assess the degree of insensitivity of the four basic strainrange versus life relationships to test temperature. Three damage rules and the assumptions behind them are discussed within the context of their application with the Strainrange Partitioning approach. An alternative analysis based on Ostergren's method is studied in a separate chapter and proved to be an easy and helpful method in predicting high temperature low cycle fatigue of several superalloys. The characterization of the creep-fatigue behaviour of MARM002 was completed by separation of initiation and propagation periods within two temperature intervals. A situation of early formation of cracks at the higher temperature interval 950°- l040°C with accelerated growth at lower tennperatures 750° - 250°C showed that great care is necessary when applying MARM002 isothermal results to cases where temperature varies.
Supervisor: Hancock, P. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available