Calculation of thermal-fatigue life based on accumulated creep damage

  • 37 Pages
  • 4.20 MB
  • English
National Aeronautics and Space Administration; [for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.] , Washington
Nimonic alloys -- Testing., Metals -- Thermal fatigue., Metals -- C
Statementby David A. Spera.
SeriesNASA technical note, NASA TN D-5489
LC ClassificationsTL521 .A3525 no. 5489
The Physical Object
Pagination37 p.
ID Numbers
Open LibraryOL5275636M
LC Control Number71604195

CALCULATION OF THERMAL-FATIGUE LIFE BASED ON ACCUMULATED CREEP DAMAGE by David A. Spera Lewis Research Center SUMMARY A method is presented for predicting the onset of thermal-fatigue cracking in high- temperature components such as turbine blades and disks which are subjected to arbi- trary, complex cycles of temperature and Size: 1MB.

Calculation of Thermal-fatigue Life Based on Accumulated Creep Damage. David A. Spera. National Aeronautics and Space Administration, - Metals - 37 pages. CALCULATION OF THERMAL-FATIGUE LIFE BASED ON ACCUMULATED CREEP DAMAGE by David A.

Spera Lewis Research Center SUMMARY A method is presented f o r predicting the onset of thermal-fatigue cracking in hightemperature components such as turbine blades and disks which a r e subjected t o arbit r a r y, complex cycles of temperature and load.

Creep Damage Calculation for Thermo Mechanical Fatigue Article (PDF Available) in Strojniski Vestnik 57(05) May with Reads How we measure 'reads'. This paper reviews the various methods available for correlating and predicting life to failure in low cycle fatigue at high temperature.

Spera D A,“Calculation of thermal fatigue life based on accumulated creep damage”. NASA report TND Google Scholar. Spera D A,“Comparison of experimental and theoretical Cited by: damage mechanisms between isothermal fatigue and TMF. Numerous examples from the literature have been surveyed recently (5).

and a wide range of behaviors between isothermal and TMF have been noted. Thermal fatigue lives are frequently less than isothermal lives when the basis for comparison is constant, inelastic strainrange.

Calculation of Thermal-Fatigue Life based on Accumulated Creep Damage, National Aeronautics and Space Administration, Washington, D.C.

() NASA TND Google ScholarAuthor: F. Rezai-Aria, L. Rémy, C. Herman, B. Dambrine. In this paper, a new model for life prediction of turbine disk alloys (GH) is proposed. Based on plastic strain energy density, a generalized energy-based fatigue–creep damage parameter is.

A theoretical calculation of the residual life can be obtained simply by the difference between expected rupture time (given by the catalogue minimum curve) and effective service time.

The theoretical residual life is compared with the experimental evaluation of residual life, based on the creep data of deformed samples (type B1 and B3 samples).Cited by: 5.

Thermo-mechanical fatigue (short TMF) is the overlay of a cyclical mechanical loading, that leads to fatigue of a material, with a cyclical thermal loading.

Thermo-mechanical fatigue is an important point that needs to be considered, when constructing turbine engines or gas turbines. The aim of this paper is to investigate different factors, including dwell time, strain range, and strain ratio on creep-fatigue endurances in nickel-based Inconel and GH superalloys.

We also summarize classic approaches for life assessments based on the generalizations of Coffin–Manson equation, linear damage summation (LDS), and Cited by: 5.

Spera, D. A., Calculation of Thermal-Fatigue Life Based on Accumulated Creep Damage, NASA TND,National Aeronautics and Space Administration.

Google Scholar by: 3. Calculation of Thermal-fatigue Life Based on Accumulated Creep Damage - Free download as PDF File .pdf), Text File .txt) or read online for free.

Scribd is the world's largest social reading and publishing site. A thermal fatigue life prediction model of microelectronic chips based on thermal fatigue tests and solder/substrate interfacial singularity analysis from finite element method (FEM) analysis is established in this paper.

To save the calculation of interfacial singular parameters of new chips for life prediction, and improve the accuracy of prediction results in actual applications, a hybrid Cited by: 1.

It is necessary to estimate the accumulated tube damage (the life fraction used up) based on the operating history—i.e., the influence from the operating pressure, the tube-metal temperature and the corrosion rate of the tube.

The uncertainties in these factors, particularly the governing temperature, may have a significant effect on the. The paper presents the results of numerical analysis of creep-fatigue damage development in a steam turbine rotor under cyclic duty.

Description Calculation of thermal-fatigue life based on accumulated creep damage EPUB

Investigations were performed for a full cycle representing the most accurate description of real operation and three simplified cycles representative of different levels of simplification in inelastic strains : Mariusz Banaszkiewicz.

Consequently, a model for cumulative damage analysis was developed using an exhaustion of ductility concept in which the total available ductility is derived from baseline thermal fatigue tests or, alternatively, estimated from stress-rupture by: Damage Mechanisms and Life Assessment of High Temperature Components Ramaswamy Viswanathan.

Year: Edition: creep temperature stress crack fatigue damage steel fig steels strain You can write a book review and share your experiences. Other readers will always be interested in.

The American Society for Testing and Materials defines fatigue life, N f, as the number of stress cycles of a specified character that a specimen sustains before failure of a specified nature occurs. For some materials, notably steel and titanium, there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles, called a fatigue limit.

Life prediction models for solders are based on methods defined by strain ranges, accumulated creep/plastic strain and accumulated strain energy density during a temperature-loading cycle studied crack propagation of SnAg based on accumulated creep/plastic strain prediction method as damage by: Thermal fatigue cracking is the cracking that happens after a metal is repeatedly heated and cooled rapidly.

Heat resistant alloys all have high coefficients of thermal expansion; most of which expand at a rate close to 1/5” per foot when heated from room temperature up to °F. Based on these stress distributions solutions, the present report presents a methodology for assessment of thermal fatigue crack growth life.

The critical sine wave frequency is calculated for both axial and hoop stress components as the value that produces the maximum tensile stress component at the inner surface. Using these.

The 1,page book contains key analyses of design and life assessment as these relate to creep and fracture in many high-temperature components in power plants, piping, and other high-temperature environments.

The chapters are based on presentations made at the EEEC Creep Conference, organized by the European Creep Collaborative published: 30 Sep,   As for turbine rotor, the simple stress on-line monitoring models of rotors temperature and thermal stress based on Greens function method are obtained.

Details Calculation of thermal-fatigue life based on accumulated creep damage EPUB

Using perturbation method, the models can deal with nonlinear problems resulting from temperature dependent properties. The working medium temperature change curve and the temperature Author: Li Kun Zheng, Yan Zhou, Dan Mei Xie.

A Fatigue Damage Analysis of Composite Construction Composed Asphalt Concrete Pavement and Steel-Box Beam Deck of Steel Bridge p Constitutive Model for the Subsequent Time-Dependent Deformations of Type Stainless Steel at Room TemperatureAuthor: Yi Sun, Rui Zhang, Jun Ma.

Load Factor Based Calculation for Gasketed Flange Connection With Cover Plate Subjected to Internal Pressure Thermal Fatigue Appears to be More Damaging Than Uniaxial Isothermal Fatigue: A Complete Analysis of the Results Obtained on the CEA Thermal Fatigue Device SplashFatigue, Pipes, Stress, Creep, Damage, Failure, Failure.

A computational approach to thermomechanical fatigue life predictions of dissimilarly welded superheater tubes - Ram Kumar Krishnasamy - Doctoral Thesis / Dissertation - Engineering - Mechanical Engineering - Publish your bachelor's or master's thesis, dissertation, term.

For upper-level undergraduate engineering courses in Mechanical Behavior of Materials. Mechanical Behavior of Materials, 4/e introduces the spectrum of mechanical behavior of materials, emphasizing practical engineering methods for testing structural materials to obtain their properties, and predicting their strength and life when used for machines, vehicles, and.

Low Temperature and Thermal Fatigue Cracking SR-OSU-AA by Ted S. Vinson Professor of Civil Engineering Oregon State University Corvallis, OR Vincent C.

Janoo Research Engineer US Army Cold Regions Research and Engineering Lab Hanover, NH and Ralph C.G. Haas Professor of Civil Engineering University of Waterloo Waterloo.

The objective of this thesis is a development of methodology for the fatigue life prediction based on damage-tolerant approach. More specific attention of framework should be given to sub-modeling of TMF crack propagation in turbine blade to achieve both computational efficiency and accuracy.

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The methodology should combine CADFile Size: 4MB. The calculations indicate that increasing the operating temperature from ° to °F ( to °C) may reduce the thermal fatigue life of the recuperator by as much as %.

Based on these calculations and practical difficulties in achieving higher degree of skin temperature regulation, the option of operating recuperators at a higher. FRACTURE TOUGHNESS The fracture resistance of a material in presence of crack is called as fracture toughness It is important as most of the engineering materials have some impurities as well as crack These comes during solidification of the metals One of the measures of fracture toughness is the elastic strain release rate G When the rate of.The Pb-Free Alloy Characterization Program sponsored by International Electronics Manufacturing Initiative (iNEMI) is conducting an extensive investigation using accelerated temperature cycling (ATC) to evaluate ball grid array (BGA) thermal fatigue performance of a significant number of commercial and experimental Sn based Pb-free solder alloys.