Download or read book Correlation of Nondestructive and Mechanical Testing of Graphite written by J. L. COOK and published by . This book was released on 1969 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: A PROGRAM WAS UNDERTAKEN TO CORRELATE DISCONTINUITIES DETECTED IN GRAPHITE BY NONDESTRUCTIVE MEANS WITH ACTUAL FAILURE LOCATION AND THE APPEARANCE OF THE DISCONTINUITY ON THE FRACTURE SURFACE OF TENSILE SPECIMENS. A SERIES OF 83 TENSILE SPECIMEN BLANKS OF POCO AXF-5Q GRAPHITE WERE ULTRASONIC PULSE-ECHO C-SCAN MAPPED AND THESE DATA COMPARED WITH POST FRACTURE ANALYSIS OF SPECIMEN FAILURE LOCATION AND DISCONTINUITY SIZE. CORRELATION WAS MADE BETWEEN THE C-SCAN MAPS AND FAILURE LOCATION, BUT THE SPECIFIC SIZE OF ACTUAL DISCONTINUITIES WAS NOT ACCURATELY PREDICTED. DISCONTINUITIES LARGER THAN 0.020 INCH MAXIMUM DIMENSION AS MEASURED ON THE FRACTURE SURFACE SIGNIFICANTLY LOWERED THE ULTIMATE TENSILE STRENGTH OF THE GRAPHITE USED IN THIS STUDY.
Download or read book The Correlation of Nondestructive Test Techniques with the Fracture Behavior of ATJ S Graphite written by W. L. Shelton and published by . This book was released on 1972 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected specimens of ATJ-S graphite were nondestructively evaluated and tensile tested in gas-bearing test facilities. The nondestructive test methods used on billets, specimen blanks, and finished specimens were visual inspection, alcohol wipe, radiography, and radiographic enhancement techniques. Correlations were made between nondestructive test indications and fracture location and strength. Low density areas were found to be the predominant weakening defect in this graphite. Fractographic examination of the fractured specimens revealed flaws which could be correlated with those flaws detected nondestructively and predicted from Griffith's theory. (Author).
Download or read book Investigation of Nondestructive Methods for the Evaluation of Graphite Materials written by G. E. Lockyer and published by . This book was released on 1966 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program of investigation was begun in April 1964, to determine nondestructive methods and techniques for evaluating and characterizing graphite materials. The properties and behavior characteristics of graphite which are important to ablative applications were identified and correlated with the applicable NDT methods and techniques during the first year. Emphasis was directed in verification of the applicability of the various NDT techniques and correlation to characterize graphite in relation to service performance has been an item of major concern. Statistical analysis of these correlations has established the significance of the correlations for predicting the related material properties. An extensive analysis of the application of NDT flaw testing and properties evaluation in regard to quality and reliability is presented. A detailed discussion of infrared technique development activities for measuring thermal properties is also presented. The influence of attenuation and the related effects of frequency distortion on velocity measurements is evaluated and described.
Download or read book Investigation of Nondestructive Methods for the Evaluation of Graphite Materials written by R. C. Stinebring and published by . This book was released on 1969 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the program was to utilize the nondestructive testing information, correlations, and techniques, developed during the previous year, for characterizing and evaluating zirconium and hafnium diboride systems and aerospace graphite materials.
Download or read book The Quantitative Significance of Nondestructive Evaluation of Graphite and Ceramic Materials written by John W. Orner and published by . This book was released on 1970 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the research was to utilize the nondestructive testing (NDT) information, correlations, and techniques developed during previous years for the formulation of an experimental approach for verifying the quantitative significance of nondestructive evaluation of graphite and high temperature ceramic materials intended for aerospace structures and systems. As a part of the program, nondestructive evaluation was carried out on a series of billets of hot pressed diboride compositions of zirconium and hafnium with various additions hot pressed. Two grades of graphite (ATJ and RVA) were investigated to determine the significance of typical defective conditions on the physical behavior of the material. Tensile specimens containing various types of flaws, as determined by nondestructive tests, were broken and the results correlated with the NDT findings. (Author).
Download or read book Nondestructive Testing Methods for Graphite Aluminum Composites written by LW. Davis and published by . This book was released on 1979 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of the C-scan method for nondestructively inspecting graphite/aluminum metal matrix composites is discussed. Specific test results are shown and mechanical properties are correlated with anomalous regions which were detected by the C-scan technique.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974-07 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation Between Non Destructive Inspection Results and Performance of Graphite Epoxy Structural Parts written by Franco Cipri and published by . This book was released on 1983 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: During production of advanced composite structural parts, because of material manufacturing process anomalies, some typical defects, such a porosity and/or delaminations, may become embodied into the final product. In order to improve the accept/reject criteria for typical defects, AERITALIA's G.V.C. Laboratories have carried out a static/fatigue test program on specimens in which various porosity levels were simulated. Further, an attempt has been made to correlate mechanical performance with the ultrasonic energy absorption measures.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Solid mechanics research for quantitative non destructive evaluation written by Jan D. Achenbach and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the Solid Mechanics Program at the Office of Naval Research (ONR), our primary mission is to establish a basic research program which addresses the funda mental issues in solid mechanics where a clear scientific understanding is lacking. Our approach involves first identifying the various scales at which material and structural response and failure occur. Within each level of behavior we address the basic mechanical phenomena for which a clear physical description is not available. ONR's program emphasizes experimental research to identify and quantify the interacting behavior and response mechanisms. Theoretical and computational approaches are developed to explain the details of the physical processes and to establish the technology necessary to control the thermomechanical behavior of materials and structures. Within the Department of Defense, it is a natural evolution that all new systems must generally operate in more demanding environments than the systems they replace. Thus, structural designers are pushed towards lighter weight, precision structures utilizing new materials. In such an environment, structural design mar gins simultaneously shrink and become more critical. Such trends make it essential that a well founded scientific base for the nondestructive detection and assessment of subcritical flaws in structural materials and structures exist. Within the ONR Solid Mechanics Program we are interested in both the identification of flaws and assessment of their degree of criticality.
Download or read book Materials Evaluation written by and published by . This book was released on 1993 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Testing for Mechanical Defects in ATJ S Graphite written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Testing of Nuclear Graphite written by and published by . This book was released on 1968 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Evaluation and Flaw Criticality for Composite Materials written by R. B. Pipes and published by ASTM International. This book was released on 1979 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collection of Technical Papers on Structures and Materials written by and published by . This book was released on 1969 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Characterization of Materials VI written by Robert E. Green and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally the vast majority of materials characterization techniques have been destructive, e. g. , chemical compositional analysis, metallographic determination of microstructure, tensile test measurement of mechanical properties, etc. Also, traditionally, nondestructive techniques have been used almost exclusively for the detection of macroscopic defects, mostly cracks, in structures and devices which have already been constructed and have already been in service for an extended period of time. Following these conventional nondestructive tests, it has been common practice to use somewhat arbitrary accept-reject criteria to decide whether or not the structure or device should be removed from service. The present unfavorable status of a large segment of industry, coupled with the desire to keep structures in service well past their original design life, dramatically show that our traditional approaches must be drastically modified if we are to be able to meet future needs. The role of nondestructive characterization of materials is changing and will continue to change dramatically. It has become increasingly evident that it is both practical and cost effective to expand the role of nondestructive evaluation to include all aspects of materials' production and application and to introduce it much earlier in the manufacturing cycle. In fact, the recovery of a large portion of industry from severe economic problems is dependent, in part, on the successful implementation of this expanded role.
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.
