One method of thermal fatigue testing of turbine blades

1976 ◽  
Vol 8 (6) ◽  
pp. 723-728 ◽  
Author(s):  
G. S. Pisarenko ◽  
A. I. Petrenko
Keyword(s):  
Thermal Fatigue ◽  
Fatigue Testing ◽  
Turbine Blades

Mathematical Techniques Applying to the Thermal Fatigue Behaviour of High Temperature Alloys

1962 ◽  
Vol 13 (4) ◽  
pp. 368-396 ◽  
Author(s):  
P. W. H. Howe
Keyword(s):  
Differential Equation ◽  
Thermal Fatigue ◽  
Gas Flow ◽  
Thermal Stresses ◽  
Fatigue Testing ◽  
Turbine Blades ◽  
Periodic Coefficient ◽  
Fatigue Behaviour ◽  
Temperature Distributions ◽  
Strain And Strain Rate

SummaryDuring thermal fatigue testing of a specimen with a thin edge, or during rapid temperature changes in the gas flow past turbine blades, the thin edges are deformed plastically in compression during heating and subsequently creep in tension as the bulk of the specimen or blade heats up. The plastic deformation is determined from temperature distributions, which are calculated by Biot’s variational method. The creep deformation is determined as a function of time by a differential equation, which expresses the balance between increasing elastic stress and reduction of stress due to creep relaxation, and which is solved(i)by digital computer,(ii)by transformation to a Riccati equation soluble in terms of Bessel functions, or(iii)by transformation to a second-order differential equation with a periodic coefficient. Using the thermal stresses obtained from the solution of the differential equation, the theoretical thermal fatigue endurance is determined from cyclic (mechanical) stress endurance data. Agreement between theoretical and experimental thermal fatigue endurances is obtained, over ranges of temperature, strain and strain rate, or, equivalently, over ranges of temperature, edge radius and heat transfer coefficient. This agreement supports the use of the theoretical methods in wider contexts. The accuracy of the temperature distributions is better than the accuracy of other factors entering into the correlation between theoretical and experimental endurances. Improvement in the interpretation of experimental results requires consideration of the alteration of the stress cycles during the course of thermal fatigue testing. This requirement is catered for partially by the various solutions of the differential equation for thermal stress.

scholarly journals Thermal Fatigue Testing of Simulated Turbine Blades

1971 ◽  
Author(s):  
D. A. Spera ◽  
F. D. Calfo ◽  
P. T. Bizon
Keyword(s):  
Thermal Fatigue ◽  
Fatigue Testing ◽  
Turbine Blades

Modeling of an equipment for thermal fatigue testing

2017 ◽  
Author(s):  
Ayrton Brandim ◽  
Antônio Edson Rocha Filho ◽  
Flávio Alves dos Santos ◽  
José Oliveira Neto ◽  
Sérgio Alves da Silva
Keyword(s):  
Thermal Fatigue ◽  
Fatigue Testing

Thermal Fatigue Testing of SiMoCr Compacted Graphite Cast Iron for HPDC Tooling Application

2020 ◽  
Vol 14 (3) ◽  
pp. 846-852
Author(s):  
Primož Mrvar ◽  
Sebastjan Kastelic ◽  
Milan Terčelj ◽  
Mitja Petrič ◽  
Branko Bauer ◽  
...  
Keyword(s):  
Cast Iron ◽  
Thermal Fatigue ◽  
Fatigue Testing ◽  
Compacted Graphite ◽  
Graphite Cast Iron

Thermal Fatigue Testing and Analysis of a Thick Perforated Ring

2007 ◽  
Author(s):  
T. M. Damiani ◽  
J. E. Holliday ◽  
M. J. Zechmeister ◽  
R. D. Reinheimer ◽  
D. P. Jones
Keyword(s):  
Crack Initiation ◽  
Thermal Fatigue ◽  
Fatigue Testing ◽  
Fatigue Crack Initiation ◽  
Three Dimensional ◽  
Fatigue Cracking ◽  
Forced Flow ◽  
Test Loop ◽  
Rapid Changes ◽  
Oxygenated Water

Thermal fatigue cracking has been observed for thick perforated spacer rings used as part of a thermal fatigue test loop operating at Bechtel Bettis, Inc. The perforated rings are used for instrumentation access to the fluid flow at the test specimen inlet and outlet, and are subject to alternating hot and cold forced flow, low oxygenated water every three minutes so that rapid changes in water temperature impart a thermal shock event to the inner wall of the rings. Thermal and structural three dimensional elastic and elastic-plastic finite element analyses (FEA) were conducted for the ring and the results used to predict fatigue crack initiation using strain-based fatigue-life algorithms. Predicted cycles-to-crack initiation agreed well with the observed cracking when alternating shear strain intensity analogous to the Tresca stress was used. This analysis qualifies the use of FEA for thermal fatigue assessments of complicated three-dimensional components.

Thermal fatigue testing of low-Z coatings on molybdenum and Inconel 625

1982 ◽  
Vol 111-112 ◽  
pp. 856-860 ◽  
Author(s):  
R. Yamada ◽  
K. Nakamura ◽  
M. Saidoh ◽  
Y. Murakami
Keyword(s):  
Thermal Fatigue ◽  
Fatigue Testing ◽  
Inconel 625

Thermal Fatigue Testing of Actively Cooled Divertor Mock-Ups after Neutron Irradiation

1998 ◽  
Vol 34 (3P2) ◽  
pp. 464-468
Author(s):  
Manfred Roedig ◽  
Reiner Duwe ◽  
Jochen Linke ◽  
Guenther Pott ◽  
Bernhard Wiechers
Keyword(s):  
Neutron Irradiation ◽  
Thermal Fatigue ◽  
Fatigue Testing
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