Download or read book A System for Estimating Cumulative Fatigue Damage by Using the Miner Rule Corrected for Residual Stress written by C. R. Smith and published by . This book was released on 1961 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the Miner rule for estimating cumulative damage is being used rather extensively in estimating service life, it is well known that such estimates can be off by several hundred percent. The largest contribution to these discrepancies is the residual stress acquired at concentrations at upper level loading. While this effect is usually beneficial, structures employing riveted connections usually suffer losses where highest loads do not exceed 30% of ultimate strength. This paper proposes using the Miner relationship in conjunction with S-N curves obtained after one application of a load equivalent to the highest load statistically probable in the first 10% of service life. Test data comparing the basic and modified methods are presented. An extension of this work would indicate that fatigue-life prediction for spectrum type loading can be based on single-load level tests. (Author).
Download or read book SAE Technical Paper Series written by and published by . This book was released on 1961 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt: Online version: Technical papers portion of the SAE Digital Library references thousands of SAE Technical Papers covering the latest advances and research in all areas of mobility engineering including ground vehicle, aerospace, off-highway, and manufacturing technology. Sample coverage includes fuels and lubricants, emissions, electronics, brakes, restraint systems, noise, engines, materials, lighting, and more. Your SAE service includes detailed summaries, complete documents in PDF, plus document storage and maintenance
Download or read book Journal of the American Helicopter Society written by American Helicopter Society and published by . This book was released on 1964 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1961-04 with total page 1746 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Society of Automotive Engineers preprints written by and published by . This book was released on 1961 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral method for fatigue damage estimation with non zero mean stress written by Pedro H. Alves Corrêa and published by Editora Dialética. This book was released on 2022-08-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis consists of a fatigue study carried out on an aluminum alloy 2024-T3 in both time domain and frequency domain. Non-zero mean random signals of strain and stress are analyzed in time domain using usual Rainflow method and the damage is accumulated with the Palmgren-Miner rule, according to mean stress equations. The signals are analyzed in frequency domain using the power spectral density and the probability density function. The spectral domain analysis does not consider the negative effect of the mean stress in metal life under fatigue, so the correction factors for mean stresses developed by Goodman, Morrow, and Smith-Watson-Topper are used to change the power spectral density and, thus, the damage calculated by the probability density functions postulated by Dirlik and Tovo and Benasciutti. It is found that both Dirlik and Tovo and Benasciutti are non-conservative for a non-zero mean stress signal when comparing the damage to the one obtained in time domain analysis. When the spectral method is corrected, the results vary from Rainflow 4.9% for wide band and 6.8% for narrow band signals, always in the conservative zone, therefore predicting more damage. Tovo and Benasciutti 2 method is found to be the spectral function with the closest results when compared to the usual Rainflow method in time domain.
Download or read book ASTM Special Technical Publication written by and published by . This book was released on 1963 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1971 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residual Stress Effects in Fatigue written by H. S. Reemsnyder and published by ASTM International. This book was released on 1982 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulative Damage Analysis in Structural Fatigue written by LF. Impellizzeri and published by . This book was released on 1970 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of residual stress on fatigue is studied using electron microscopy on fracture surfaces of specimens tested under spectrum loading. The level of residual stress that exists at the point of stress concentration is shown to be one of the parameters affecting striation spacing. A review of numerous variable amplitude test results generated by government agencies and aerospace companies further suggests that a straightforward technique quantitatively defining the effect of continually changing residual stress patterns should provide a reliable tool for predicting cumulative damage in fatigue. The two major difficulties relating to the utilization of residual stress considerations in a cumulative damage rule are: (a) determining the level of residual stress existing at the notch root; and (b) computing its effect on N, cycles to failure. A cumulative damage rule including the developments in (a) and (b) above is presented. Essentially, the rule involves the use of conventional ?n/N computations, except the selection of a value for N is affected by the levels and variations of residual stress existing at a discontinuity. Loading parameters that affect fatigue-life predictions using the cumulative damage rule include peak load level, load ratio, block size, and load-level sequence. Typical laboratory spectrum-test results that are investigated include the NASA gust spectrum. Specimens tested to this spectrum sustained 9 blocks to failure in a low-high sequence, 26 blocks in a high-low sequence, and 20 blocks in a high-low-high-sequence. Corresponding life predictions are 10.9, 25.2, and 19.6 blocks to failure.
Download or read book Application of a Double Linear Damage Rule to Cumulative Fatigue written by S. S. Manson and published by . This book was released on 1967 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Establishment of the Approach To and Development Of Interim Design Criteria for Sonic Fatigue written by G. E. Fitch and published by . This book was released on 1962 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: A literature survey provided the background from which an approach was selected for development of design criteria for sonic fatigue. The approach selected was accelerated, discrete frequency life-testing, the results of which are interpreted using a sine-random equivalence analysis. This approach offers the best compromise between economy, accuracy, and lead time to cover structural design problems for advanced design, design development, and prooftesting of completed vehicle structure. Methods were extracted from the literature with which to predict the acoustic environment and determine the duration of various environments from mission analysis. Fatigue data and an examination of cumulative damage are presented in support of the sine-random equivalence technique. This method takes advantage of the extensive fatigue S-N data available in the industry. Examples of the application of the analytical-empirical techniques are presented.
Download or read book Local Stress strain Approach to Cumulative Fatigue Damage Analysis written by JoDean Morrow and published by . This book was released on 1974 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: A cumulative fatigue damage procedure for estimating the fatigue crack initiation life of notched structural members subjected to known load histories is outlined. This procedure assumes that a knowledge of the local cyclic stress-strain response of the metal at the most severely strained region in a member is sufficient to predict when a crack will form there. Some of the steps in this procedure that are of current interest and which are especially applicable to a local stress-strain approach are discussed. Alternative, approximate and/or abbreviated steps in the cumulative fatigue damage procedure are given wherever possible. Limitations of the method and areas where research is needed are pointed out. Cumulative fatigue test results for smooth specimens, notched plates and built-up box beams are compared to life calculations made using the local stress-strain approach. Cyclic deformation and fracture properties, used in the analysis, were obtained from tests on a limited number of axially loaded unnotched specimens. These examples indicate that a cumulative fatigue damage analysis based on the local stress-strain approach employing a minimum amount of materials test data can be used to make reasonable life estimates for members similar to many practical structural members. (Modified author abstract).
Download or read book The SAE Journal written by and published by . This book was released on 1961-07 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 30-54 (1932-46) issued in 2 separately paged sections: General editorial section and a Transactions section. Beginning in 1947, the Transactions section is continued as SAE quarterly transactions.
Download or read book Cumulative Index of The SAE Papers written by Society of Automotive Engineers and published by . This book was released on 1990 with total page 1482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Re examination of Cumulative Fatigue Damage Analysis an Engineering Perspective written by S. S. Manson and published by . This book was released on 1986 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CUMULATIVE FATIGUE DAMAGE DUE TO SPECTRAL LOADING written by JOHN P. HARRIS, CHARLES LIPSON and published by . This book was released on 1964 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
