Download or read book Detection of Fatigue Crack Growth Using Nondestructive Testing Methods written by Zoran Stankovic and published by . This book was released on 2009 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Detection of Fatigue Cracks by Nondestructive Testing Methods written by Ward D. Rummel and published by . This book was released on 1974 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-RADIOGRAPHIC, PENETRANT, ULTRASONIC, EDDY CURRENT, HOLOGRAPHIC, AND ACOUSTIC EMISSION TECHNIQUES WERE OPTIMIZED AND APPLIED TO THE EVALUATION OF 2219-T87 ALUMINUM ALLOY TEST SPECIMENS. ONE HUNDRED EIGHTEEN SPECIMENS CONTAINING A TOTAL OF 328 FATIGUE CRACKS WERE EVALUATED. THE CRACKS RANGED IN LENGTH FROM 0.500 INCH (1.27 CM) TO 0.007 INCH (0.018 CM) AND IN DEPTH FROM 0.178 INCH (0.451 CM) AND 0.001 INCH (0.003 CM). SPECIMEN THICKNESSES WERE NOMINALLY 0.060 INCH (0.152 CM) AND 0.210 INCH (0.532 CM) AND SURFACE FINISHES WERE NOMINALLY 32 AND 125 RMS AND 64 AND 200 RMS RESPECTIVELY. SPECIMENS WERE EVALUATED IN THE 'AS-MILLED' SURFACE CONDITION, IN THE CHEMICALLY MILLED SURFACE CONDITION AND, AFTER PROOF LOADING, IN A RANDOMIZED INSPECTION SEQUENCE. RESULTS OF THE NONDESTRUCTIVE TEST (NDT) EVALUATIONS WERE COMPARED WITH ACTUAL CRACK SIZE OBTAINED BY MEASUREMENT OF THE FRACTURED SPECIMENS. INSPECTION DATA WERE THEN ANALYZED TO PROVIDE A STATISTICAL BASIS FOR DETERMINING THE THRESHOLD CRACK DETECTION SENSITIVITY (THE LARGEST CRACK SIZE THAT WOULD BE MISSED) FOR EACH OF THE INSPECTION TECHNIQUES AT A 95% PROBABILITY AND 95% CONFIDENCE LEVEL.
Download or read book Fatigue Crack Measurement written by Kenneth James Marsh and published by . This book was released on 1991 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Crack Growth written by Hans Albert Richard and published by Springer. This book was released on 2016-06-13 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a concise introduction to fatigue crack growth, based on practical examples. It discusses the essential concepts of fracture mechanics, fatigue crack growth under constant and variable amplitude loading and the determination of the fracture-mechanical material parameters. The book also introduces the analytical and numerical simulation of fatigue crack growth as well as crack initiation. It concludes with a detailed description of several practical case studies and some exercises. The target group includes graduate students, researchers at universities and practicing engineers.
Download or read book Nondestructive Testing written by Warren J. McGonnagle and published by CRC Press. This book was released on 1961 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Testing Methods for Steel Bridges written by and published by . This book was released on 1986 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Test Methods for Fracture and Fatigue Crack Growth written by W. H. Cullen and published by ASTM International. This book was released on 1985 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Fatigue Crack Growth at Welds written by C. C. Monahan and published by Computational Mechanics. This book was released on 1995 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Welded components are inspected periodically to ensure safety in operation, but cost effective inspection planning demands that accurate non-destructive test techniques be used to detect and size fatigue cracks. This text contains research on monitoring and predicting early fatigue cracks.
Download or read book Research on Exploratory Development of Nondestructive Methods for Crack Detection written by Rudi M. Schroeer and published by . This book was released on 1970 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a research study devoted to exploratory development of a nondestructive method for crack detection are reported. The method investigated is based upon an Acoustic Impact Technique (AIT), which consists of the analysis of the vibrations in the test specimens produced by mechanical pulses. The 'time-to-damp' of these vibrations was the primary factor evaluated. General design considerations for the test probes are discussed. The possibility of improving the accuracy and sensitivity of the AIT by a Damping Decrement Computer was investigated and a breadboard model constructed. Fatigue crack investigations were performed and the AIT-measurements correlated with fatigue cycles, crack detection and crack growth. The test results presented indicate that changes in the material are detected before a microscopic crack can be observed on the surface of the fatigue sample. During a fatigue life time test on a specimen with Taper-Lok fasteners, cracks in the hole walls were indicated by the AIT and later verified after removing the fasteners. Tests on adhesively bonded interfaces in honeycomb, dual and multilayer assemblies proved that defects can be detected with the AIT and that the spatial location and the nature of defects can be determined through use of the appropriate frequencies. (Author).
Download or read book Investigation of the Effects of Manufacturing Variations and Materials on Fatigue Crack Detection Methods in Gear Teeth written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue life of a gear tooth can be thought of as the sum of the number of cycles required to initiate a crack, N(sub i), plus the number of cycles required to propagate the crack to such a length that fracture occurs, N(sub p). The factors that govern crack initiation are thought to be related to localized stress or strain at a point, while propagation of a fatigue crack is a function of the crack tip parameters such as crack shape, stress state, and stress intensity factor. During a test there is no clear transition between initiation and propagation. The mechanisms of initiation and propagation are quite different and modeling them separately produces a higher degree of accuracy, but then the question that continually arises is 'what is a crack?' The total life prediction in a fracture mechanics model presently hinges on the assumption of an initial crack length, and this length can significantly affect the total life prediction. The size of the initial crack is generally taken to be in the range of 0.01 in. to 0.2 in. Several researchers have used various techniques to determine the beginning of the crack propagation stage. Barhorst showed the relationship between dynamic stiffness changes and crack propagation. Acoustic emissions, which are stress waves produced by the sudden movement of stressed materials, have also been successfully used to monitor the growth of cracks in tensile and fatigue specimens. The purpose of this research is to determine whether acoustic emissions can be used to define the beginning of crack propagation in a gear using a single-tooth bending fatigue test. Wheitner, Jeffrey A. and Houser, Donald R. Unspecified Center ACOUSTIC EMISSION; ACOUSTIC MEASUREMENT; BENDING FATIGUE; CRACK PROPAGATION; FATIGUE LIFE; FATIGUE TESTING MACHINES; FRACTURE MECHANICS; GEAR TEETH; NONDESTRUCTIVE TESTS; BEND TESTS; CRACKS; DETECTION; FATIGUE TESTS; STIFFNESS; STRESS WAVES...
Download or read book Structural Integrity Assessment written by P. Stanley and published by CRC Press. This book was released on 1992-03-10 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: The assessment of structural integrity is a vitally important consideration in many fields of engineering, which has an influence on the full range of professional activities from conception, design and analysis, through operation to residual life evaluation and possible life extension. In devising satisfactory procedures for this purpose there is
Download or read book Emerging Technologies in Non Destructive Testing V written by Alkiviadis S. Paipetis and published by CRC Press. This book was released on 2012-01-26 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-destructive evaluation (NDE) methods have dominated most of the fields of applied research and technology over the last twenty years. These techniques provide information on the functional efficiency of materials and structures without causing any structural impact on the structure itself. Their use enables the monitoring of the structural integrity, the structural condition as well as the service in-duced degradation of materials and structures during their service life. In this respect, they address a vast field of applications ranging from the aerospace and automotive industry to civil engineering structures and material quality control. This volume comprises scientific papers presented during the Fifth Conference on Emerging Technologies in Non-Destructive Testing (Ioannina, Greece, 19–21 September 2011). A broad spectrum of related research was presented during the course of the conference, including optical, acoustic, thermal, electrical and electromagnetic methods together with imaging tomographic and signal processing techniques. Special attention was given to NDE for Civil Engineering Structures and for the first time in the conference series, a multiple session on NDE for the protection of cultural heritage was organized. Emerging Technologies in Non-Destructive Testing V contains contributions by experts in this field from 22 different countries worldwide. Reflecting the stateof-the-art in Non-Destructive Evaluation, the book will prove to be a valuable companion to students, engineers and industrial partners who are active in the field of non-destructive evaluation and testing. This volume will also provide students and researchers with insight into the focal points of contemporary research efforts in the field of non-destructive evaluation.
Download or read book Research on Exploratory Development of Nondestructive Methods for Crack Detection written by Rudi Schroeer and published by . This book was released on 1971 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a research study devoted to exploratory development of a non-destructive method for crack detection are reported. The method investigated is based upon and Acoustic Impact Technique (AIT), which consists of the analysis of the vibrations in the test specimens produced by mechanical pulses. Specimens of 6061-T6 aluminum and D6ac steel were fatigue while their acoustic impact responses were measured in order to correlate their AIT responses with the beginning and growth of cracks. In several instances the beginning of subsurface defects that could only be verified by metallographic examination were indicated by the AIT measurements. The influence of metallurgical conditions upon the Acoustic Impact Technique was investigated. Specimens of 4340 steel and 2024 aluminum, having various metallurgical treatments, were AIT tested and their signal responses analyzed. Fatigue tests made on 1020 steel and 6Al-4V titanium specimens showed a common pattern in the function: Bending Fatigue Cycles vs AIT Signal Responses. (Author).
Download or read book Fatigue Crack Growth Measurement and Data Analysis written by S. J. Hudak and published by ASTM International. This book was released on 1981 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Small crack Test Methods written by James M. Larsen and published by ASTM International. This book was released on 1992 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the most recent methods for testing small cracks in a variety of materials, providing detailed quantitative information on necessary procedures for data acquisition. Emphasizes the characterization of small, three-dimensional fatigue cracks, initiated either naturally or artificially. The ei
Download or read book Mechanics of Nondestructive Testing written by Stinchcomb and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synergism of the mechanics of nondestructive testing and the mechanics of materials response has great potential value in an era of rapid development of new materials and new applications for con ventional materials. The two areas are closely related and an advance in one area often leads to an advance in the other. As our understanding of basic principles increases, nondestructive testing is outgrowing the image of "black box techniques" and is rapidly becoming a legitimate technical area of science and engineering. At the present time, however, an understanding of the mechanics of nondestructive testing is lagging behind other advances in the field. The key to further development in the mechanics of nondestructive testing lies in the mechanics of the phenomena or response being investigated - a better understanding of materials response suggests better nondestructive test methods to investigate the response which, in turn, advances our understanding of materials response, and so on. With this approach in mind, the Materials Response Group of the Engineering Science and Mechanics Department at Virginia Polytechnic Institute and State University hosted a Conference on the Mechanics of Nondestructive Testing on September 10 through 12, 1980. Sponsors of the conference were the Army Research Office, the National Science Foundation, and the Engineering Science and Mechanics Department.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
