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Thursday, May 14, 2020 | History

3 edition of Cyclic creep analysis from elastic finite-element solutions found in the catalog.

Cyclic creep analysis from elastic finite-element solutions

Cyclic creep analysis from elastic finite-element solutions

  • 75 Want to read
  • 35 Currently reading

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

    Subjects:
  • Crack initiation.,
  • Creep analysis.,
  • Cyclic loads.,
  • Elastic properties.,
  • Finite element method.,
  • Stress relaxation.,
  • Thermodynamic cycles.

  • Edition Notes

    StatementA. Kaufman and S.Y. Hwang.
    SeriesNASA technical memorandum -- 87213
    ContributionsHwang, S. Y., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17115594M

    surface; subsequently, the elastic modulus is set to zero in all directions (ANSYS ), and the element effectively disappears. During this study, it was found that if the crushing capability of the concrete is turned on, the finite element beam models fail prematurely. Crushing of the concrete started to. S. Methods of Structural Analysis Elastic-Viscoelastic Analogy for Aging Materials Homogeneous Structures and McHenry's Analogy A. McHenry's Analogy Numerical Step-by-Step Methods Conversion of Inelastic Strains to Applied Loads Approximate Solutions Based on Simplified Creep Laws A. Effective Modulus Method.

      Traditionally, mechanical properties as determined from sensile-test specimens are assumed to be truly uniaxial and are used directly in finite-element codes for design purposes. In this paper, the stress and strain distributions in two test geometries, an hourglass specimen and a cylindrical specimen, are critically examined by means of the nonlinear finite-element code by: 7. A Simplified Method for Elastic-Plastic-Creep Structural Analysis A. Kaufman. A. Kaufman. Good agreement was found between these analytical results and nonlinear finite element solutions for these problems. The simplified analysis program used less than 1 percent of the CPU time required for a nonlinear finite element analysis. Issue Cited by: 3.

    Creep deformation of solid structures has become of increasing concern to the design and application of engineering structures in a high temperature environment. Most nuclear reactor core and high temperature, high performance engine components are vulnerable to creep failure. Creep can also cause catastrophic failure of pressure : Tai-Ran Hsu.   "Creep Modeling for Structural Analysis" develops methods to simulate and analyze the time-dependent changes of stress and strain states in engineering structures up to the critical stage of creep rupture. The principal subjects of creep mechanics are the formulation of constitutive equations for creep in structural materials under multi-axial stress states; the application of structural.


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Cyclic creep analysis from elastic finite-element solutions Download PDF EPUB FB2

Get this from a library. Cyclic creep analysis from elastic finite-element solutions. [A Kaufman; S Y Hwang; United States. National Aeronautics and Space Administration.].

FINITE ELEMENT ELASTIC-PLASTIC-CREEP AND CYCLIC LIFE ANALYSIS OF A COWL LIP Vinod K. Arya University of Toledo Toledo, Ohio and Matthew E.

Melis and Gary R. Halford National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio Summary Results are presented of elastic, elastic-plastic, and elastic-File Size: 3MB. Results are presented of elastic, elastic-plastic and elastic-plastic-creep analyses of an actively cooled cowl lip.

A cowl lip is part of the leading edge of an engine inlet of proposed hypersonic aircraft and is subject to severe thermal loadings. This book is aimed at analysts who have a minimum of one year’s experience of static elastic stress analysis and who wish to undertake a creep analysis.

Whilst elastic/plastic stress analysis commonly involves designing a structure to sustain a load, creep analysis is used to design a structure for a life. A finite element elastic-plastic and creep analysis of a nozzle-to-cylinder intersection subject to cyclic thermal shock, internal pressure, and mechanical loads is presented.

The nozzle configuration is that of the intermediate heat exchanger (IHX) for the Fast Flux Test Facility (FFTF). Bathe, K. J., et al. “On Some Current Procedures and Difficulties in Finite Element Analysis of Elastic-Plastic Response.” Computers & Structures 12 (October ): Snyder, M.

D., and K. Bathe. “A Solution Procedure for Thermo-Elastic-Plastic and Creep Problems.” Nuclear Engineering and Design 64 (March ): Usually these techniques are benchmarked against a few simple cases with algebraic solutions such as the Bree problem, or a full plastic cyclic analysis using a non-linear commercial finite element code.

It is our experience that the advantages of one of the alternative techniques (the rapid cycle solution) over full cyclic analysis are by: The cyclic strength coefficient K’ and the cyclic strain hardening exponent n’ are related by Equation Instead of using the nonlinear least-squares method (Langlais and Vogel, ) for the Masing equation, Equationthe fitting procedure illustrated here is to use the linear least-squares analysis to fit the entire range of the logarithms of stress and plastic strain data.

Cyclic creep analysis from elastic finite-element solutions A uniaxial approach was developed for calculating cyclic creep and stress relaxation at the critical location of a structure.

@article{osti_, title = {Biaxial ratcheting and cyclic plasticity for Bree-type loading. Part 1: Finite element analysis}, author = {Ng, H W and Nadarajah, C}, abstractNote = {The Bree diagram has been incorporated in the ASME B and PV Code in the elevated temperature Code Case N47 as a design approach for limiting strain accumulation in cylinders subjected to cyclic thermal loadings.

A common approach adopted in analytical [11] [12][13] and finite element (FE) models [11,14] for estimating the creep deformation rate of materials under cyclic loading conditions is to use a.

interaction between creep and plasticity in a simple fashion. Numerical results are presented for cyclic plasticity and creep, in order to verify the validity of the present theories.

It is shown that the present constitutive relations are simple in form, and the material constants involved are few in number. PROFESSOR: Ladies and gentlemen, welcome to this lecture on nonlinear finite element analysis of solids and structures.

In this lecture, I'd like to continue with our discussion of inelastic material descriptions we use in finite element analysis. Particularly, I'd. Finite element analysis of cyclic indentation of an elastic-perfectly plastic half-space by a rigid sphere S L Yan and L Y Li Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 5, Cited by: Mats G.

Larson, Fredrik Bengzon The Finite Element Method: Theory, Implementation, and Practice November 9, SpringerFile Size: 2MB. In the analysis of materials containing regularly placed in-homogeneities, the evaluation of homogenized properties is an important issue.

Common procedure for the homogenization is to define a unit cell, load it somehow, and investigate its structural response. A periodic variation of strain appears when the periodically heterogeneous material is under uniform macro-stress, and therefore, the Cited by: 1.

Biaxial Ratcheting and Cyclic Plasticity for Bree-Type Loading—Part I: Finite Element Analysis Comparison Between Finite Element Analysis and Theory,” A Simplified Method for Elastic-Plastic-Creep Structural Analysis.

Eng. Gas Turbines Power (January, )Cited by: 8. His experience includes Fitness-for-service assessments and design support of pressurized equipment including elastic-plastic Finite Element Analysis, transient heat transfer analysis, creep, high-and low cycle fatigue, fracture mechanics, fluid surge and piping flexibility analysis.

implemented in equation (7) in ABAQUS for the solution of creep analyses by finite element methods. 4 CREEP OF A LAP-JOINT SPECIMEN A creep analysis has been carried out of a lap joint having the dimensions and geometry shown in figure 1.

A load of N was applied to the specimen for a duration of s. The material parameters for the adhesive. computational creep damage is very active among research community and high temperature industry. This paper presents a development and preliminary validation of in-house finite element analysis software for creep damage analysis.

The Fortran 90 and existing finite element library were adopted and used in the software development. composite was analysed using finite element techniques. The analysis, based on the elastic and creep properties of each constituent, considered the influence of fibre-matrix bonding and processing-related residual stresses on creep and creep-recovery behaviour.

Both two- and three- dimensional finite element models were by: For the general case of including a creep law in a more complex finite element analysis, accumulating creep strain in the model will result in increased deformation, reduced stress or a combination of both behaviors.

If an element is free to deform, the creep strain will produce an increase in total strain.In order to obtain the viscoelastic constitutive relation of High Modulus Asphalt Concrete (HMAC), the constitutive relationship is used to carry on the various numerical calculation, utilize integral transforming in its Bailey-Norton creep rule, and establish new practical model.

Combining with the collection data from creep tests of uniaxial compression, regression calculation is carried out Cited by: 2.