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Wednesday, July 22, 2020 | History

3 edition of A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite found in the catalog.

A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite

A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite

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  • 10 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Metals -- Fatigue.,
  • Metallic composites.

  • Edition Notes

    StatementYong-Suk Kim and Michael J. Verilli and Gary R. Halford.
    SeriesNASA technical memorandum -- 105780., NASA technical memorandum -- 105780.
    ContributionsVerilli, Michael J., Halford, G. R., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14686363M

    A viscosity-based life prediction model for strain control mode was derived in the authors’ pre-vious work (Zhu et al., b) and applied to a number of LCF tests on a GH Superalloy. Since the existing ductility model was not suitable for life prediction under stress control mode, this article. A novel phenomenological model taking into account the creep-fatigue interaction in composite materials’ fatigue performance is introduced in this paper. The model is based on the derivation of a master curve by using existing experimental fatigue data from a wide range of composite laminates and adhesively bonded composite joints. The developed model can subsequently be used in order to.

    CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The creep-fatigue interaction has been studied and innovative mathematical models are proposed to predict the operating life of aircraft components, specifically gas turbine blades subject to creep-fatigue at high temperatures. The historical evolution of the creep-fatigue lifetime prediction is given in order to. Three cavity growth models were applied to four types of solder alloys to predict creep-fatigue life by taking into account the tensile loading component as well as the compressive loading component when reversed process can occur. An algorithm to more».

    initiation. The present work primarily focuses on development of a new approach in life prediction under creep-fatigue interaction. The elastic finite element analysis were carried out with ABAQUS/CAE and life prediction calculations are done with fe-safe/TURBOlife tool. In this paper, creep-fatigue tests were performed to investigate the relationship between the cavity and creep-fatigue life under various tensile hold times. Test materials were HAZ and base metal of P (12 Cr-2 W) alloy weldment. The effect of hold times on the cavity damage was examined and the fraction of cavity area was analyzed.


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A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite Download PDF EPUB FB2

The methodology uses a cavity growth model developed for prediction of creep fracture. Instantaneous values of strain rate and stress in the copper matrix during fatigue cycles. The methodology uses a cavity growth model developed for prediction of creep fracture.

Instantaneous values of strain rate and stress in the copper matrix during fatigue cycles were calculated and incorporated in the model to predict cyclic : Young-Suk Kim, Michael J.

Verrilli, Gary R. Halford. A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite - NASA/ADS A microstructural model was developed to predict creep-fatigue life in a (0)(sub 4), 9 volume percent tungsten fiber-reinforced copper matrix composite at the temperature of : Young-Suk Kim, Michael J.

Verrilli, Gary R. Halford. Get this from a library. A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite. [Yong-Suk Kim; Michael J Verilli; Gary R Halford; United States. National Aeronautics and Space Administration.].

The methodology uses a cavity growth model developed for prediction of creep fracture. Instantaneous values of strain rate and stress in the copper matrix during fatigue cycles were calculated and incorporated in the model to predict cyclic life.

A simulation-based procedure of probabilistic creep fatigue life prediction of composite materials is presented with the proposed damage accumulation model. Uncertainties in loading are considered.

Under cyclic deformation, the dominant damage mechanism of in situ composite solders is proposed to be growth of cavities. A constrained cavity growth model is applied to predict creep-fatigue life by taking into account the tensile loading component as well as the compressive loading component when reversed processes can occur.

To improve creep fatigue life calculation, Saxena proposed a model for predicting the creep–fatigue cracking. A threshold frequency was introduced to indict that the creep crack propagation only started up under the frequency f total crack growth rate has the following form,()dadN=CΔKm+DΔK2ϕfϕf0ϕ the NASA HOST Program, "Creep Fatigue Life Prediction for Engine Hot Section Materials (Isotropic)", being conducted by Pratt & Whitney Aircraft.

The program is a 5-year, two part effort aimed at improving the high temperature crack initiation prediction technology for gas turbine hot section components.

predict the operating life of aircraft components, specifically gas turbine blades subject to creep-fatigue at high temperatures. The historical evolution of the creep-fatigue lifetime prediction is given in order to place the present study in the context.

A literature review of the life estimation under creep-fatigue envi-ronment is presented. A model for predicting low-cycle fatigue life under creep-fatigue interaction is suggested. The reduction in fatigue life in this region is caused by the nucleation and growth of grain boundary cavities.

The crack advance will be unstable if the crack tip opening displacement becomes equal to a critical cavity configuration.

A CREEP CAVITY GROWTH MODEL FOR CREEP-FATIGUE LIFE PREDICTION OF A UNIDIRECTIONAL W/Cu COMPOSITE Yong-Suk Kim Research Institute of Industrial Science and Technology Metallic Materials Division P.O.

BoxPohangKorea Michael J. Verrilli and Gary R. Halford National Aeronautics and Space Administration Lewis Research Center Cleveland.

• Creep cavity growth model can describe fatigue failure. • Contribution of cavity nucleation to fatigue life is neglected (preexisting cavities experimentally observed).

Takahashi, Yukio, Dogan, Bilal, and Gandy, David. "Systematic Evaluation of Creep-Fatigue Life Prediction Methods for Various Alloys." Proceedings of the ASME Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Prague, Czech Republic. July 26–30, pp. ASME. A creep cavity growth model for creep-fatigue life prediction of a unidirectional W/Cu composite Conference Kim, Youngsuk ; Verrilli, M J ; Halford, G R A microstructural model was developed to predict creep-fatigue life in a (0)[sub 4], 9 volume percent tungsten fiber-reinforced copper matrix composite at the temperature of K.

Results of life prediction The “modified ductility exhaustion (MDE) method” outlined above was applied to calculate accumulated creep damage at failure in creep-fatigue tests performed on three kinds of high chromium ferritic steels used in recent fossil plants.

Fatigue damage is simply calculated as a. creep-fatigue interaction factor which is the ratio of the creep-fatigue interaction life obtained from any condition of engine operation to a reference creep-fatigue interaction life. The developed creep-fatigue interaction life consumption analy-sis procedure was applied to 8.

Damage rate equations (DRE). A single crack growth equation for combined creep-fatigue was originally developed by Majumdar and Maiya (, ). A coupled crack-growth and cavity- growth model was later developed by Majumdar () for the particular case of strain cycling an austenitic stainless steel.

Computational Modeling and Analysis of a Center-Cracked Panel Repaired by Bonded Composite Patch Analysis of Stress Distributions in a Fibre/Matrix Fragment p Theoretical Consideration on Cavity Growth Process under Creep-Fatigue Condition p Cavity Growth Model, Creep, Creep Cavity, Creep Fatigue, Damage Mechanics.

The first part of the book reviews the modeling of viscoelastic and viscoplastic behavior as a way of predicting performance and service life. Final sections discuss techniques for modeling creep rupture and failure and how to test and predict long-term creep and fatigue in polymer matrix composites.

Creep-Fatigue Life Prediction - A Ductility Model Creep-Fatigue Life Prediction - A Ductility Model Goswami, Tarun Creep-fatigue life prediction methods are briefly reviewed. Phenomenological methods of life prediction are very popular, since they use several test and metallographic parameters in model formulation.

A uniform nonlinear creep fatigue damage model based on “disorder” and a modified failure rule coupled with the load history effect were presented in the paper.

The creep fatigue life under 2-step load at high temperature was evaluated by the damage model and the modified rule.In materials science, creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of persistent mechanical can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material.

Creep is more severe in materials that are subjected to heat for long periods and.