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Validation of a Crack Initiation Life Analysis Procedure
Technical Paper
2000-01-1666
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Any analysis tool should be validated to verify computation accuracy. Fatigue analysis processes are inherently complex to validate due to the sensitivity and interdependency of variables. In the current work the authors systematically separate the variables for independent evaluation and verification. The approach is the result of new Neuber notch analysis equations, derived by the authors, and draws upon the experience of the authors as well as several other analysts in developing an approach that reduces interaction between variables. The extension of the Neuber’s Rule into multiaxial format is presented. Each building block of the process is discussed: loads and load histories, stresses, stress concentrations, notch analyses (uniaxial and multiaxial), material properties (stress-strain response as well as life data), and damage accumulation. A method to account for fretting is discussed. Occasionally, during an evaluation, a variable is either overlooked or not quantified well. The deviations in life computations due to the effects of these omissions or inaccuracies are presented. These effects arise from different aspects such as omission of residual stresses, accuracy of stress computation, inadequacy of stress concentration values, and unknown or inaccurate representations of surface finish.
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Citation
Leist, R. and Shi, Y., "Validation of a Crack Initiation Life Analysis Procedure," SAE Technical Paper 2000-01-1666, 2000, https://doi.org/10.4271/2000-01-1666.Also In
References
- Impellizzeri, L.F. Cumulative Damage Analysis in Structural Fatigue Effects of Environment and Complex Load History on Fatigue Life, ASTM STP 462, American Society for Testing and Materials 1970 40 68
- Rich, D.L. Impellizzeri, L.F. Fatigue Analysis of Cold-Worked and Interference Fit Fastener Holes Cyclic Stress-Strain and Plastic Deformation Aspects of Fatigue Crack Growth, ASTM STP 637, American Society for Testing and Materials 1977 153 175
- De Jonge, J. E. The Monitoring of Fatigue Loads, National Luncht-En Ruimtevaartlaboratorium (NLR), MP 700104
- Neuber, H. Theory of Stress Concentration for Shear-Strained Prismatical Bodies With Arbitrary Nonlinear Stress-Strain Law Transactions of the ASME, American Society of Mechanical Engineers, December 1961
- Pilkey, W.D. Peterson’s Stress Concentration Factors, 2 nd John Wiley & Sons, 1997
- Stippes, M. Wilson, H.B., Jr Krull, F.N. A Contact Stress Problem for a Smooth Disk in an Infinite Plate 1962 Proceeding of the Fourth U.S. National Congress of Applied Mechanics
- Niu, Michael, C. Y., Airframe Structural Design Conmilit Press Ltd. Hong Kong Technical Book Company, Los Angeles, CA 1988
- Jarfall, L.E. Optimum Design of Joints: The Stress Severity Factor Concept, The Aeronautical Research Institute of Sweden 1967
- Engineering Sciences Data Unit 81006, Stress Concentration Factors at Holes
- Fuchs, H. O. Stevens, R.I. Metal Fatigue in Engineering Wiley Interscience 1980
- Stroede, C.L. Characterization and Prediction of Fatigue Crack Formation and Fatigue Crack Growth Behavior of the 7050-T73511 Aluminum Alloy Using Strain-Life and Linear Elastic Fracture Mechanics Techniques M.S. Thesis Kansas State University 1998
- SAE 930401 Klann, D.A Tipton, S.M. Cordes, T.S. Notch Stress and Strain Estimation Considering Multiaxial Constraint SAE special publication SP-93/1009.
- Johnson, R.C. Designing for Surface Finish Tech Notes, Machine Design 45 11 108 3 May 1973
- SAE J1099, Technical Report on Fatigue Properties.