Download or read book Model Analysis of Fatigue Life Estimation of Welded Structures microform written by Muhammad A. Wahab and published by National Library of Canada. This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study includes both an experimental and theoretical analysis of the effect of residual stresses on the fatigue life of butt-welded low-alloy steel structures. The purpose is to develop a more complete method to estimate the total fatigue life of a weldment. To theoretically calculate the total fatigue life the process was considered as a combination of crack initiation and crack propagation lives. The initiation portion was based on an extension of the local-strain fatigue life initiation model to accomodate the effect of residual and mean stresses. To determine the local notch-root stress-strain condition more accurately a relationship between the fatigue notch and stress concentration factors was developed. Using elastic superposition and modifying Neuber's equation, which relates nominal stress-strain to local notch-root stress-strain residual stresses at the weld-toe were simulated. This analysis allows a more complete estimation of crack initiation life. For the theoretical analysis of fatigue crack propagation life Forman's equation with an appropriate combination effective stress ratio, axial and bending stresses along with residual stress effects was considered. To incorporate the residual stress distribution at the weld-toe a theoretical expression which correlates closely with experimentally determined distributions was developed. Unlike previous investigations this analysis allows the study of the combined effects of axial loading, bending stresses and residual stresses on the fatigue crack propagation life to be considered. With this theoretical model the total fatigue life can be predicted using basic material properties and the loading history including any surface treatment. To test the suitability of this analysis it was applied to welds with mechanically and thermally induced surface stresses. The residual stresses due to various treatments (annealing, tensile preloading, glass and steel shot peening, single and multiple point hammer peening and stress peening) were used to theoretically predict the total fatigue life. The more complete theoretical analysis of the total fatigue life was compared to the experimental results for all the treated and untreated welded specimens. The results show very good agreement; the variations in applied stress for a given fatigue life were between four to 15% for all the treatments listed above.
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1995 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Bibliography of Technical Reports written by and published by . This book was released on 1954 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Fatigue Life Analyses of Welded Structures written by Tom Lassen and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Avoiding or controlling fatigue damage is a major issue in the design and inspection of welded structures subjected to dynamic loading. Life predictions are usually used for safe life analysis, i.e. for verifying that it is very unlikely that fatigue damage will occur during the target service life of a structure. Damage tolerance analysis is used for predicting the behavior of a fatigue crack and for planning of in-service scheduled inspections. It should be a high probability that any cracks appearing are detected and repaired before they become critical. In both safe life analysis and the damage tolerance analysis there may be large uncertainties involved that have to be treated in a logical and consistent manner by stochastic modeling. This book focuses on fatigue life predictions and damage tolerance analysis of welded joints and is divided into three parts. The first part outlines the common practice used for safe life and damage tolerance analysis with reference to rules and regulations. The second part emphasises stochastic modeling and decision-making under uncertainty, while the final part is devoted to recent advances within fatigue research on welded joints. Industrial examples that are included are mainly dealing with offshore steel structures. Spreadsheets which accompany the book give the reader the possibility for hands-on experience of fatigue life predictions, crack growth analysis and inspection planning. As such, these different areas will be of use to engineers and researchers.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1986 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
