Download or read book Results of the Round Robin on Opening Load Measurement Conducted by ASTM Task Group E24 04 04 on Crack Closure Measurement and Analysis written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental Round Robin on the measurement of the opening load in fatigue crack growth tests was conducted on Crack Closure Measurement and Analysis. The Round Robin evaluated the current level of consistency of opening load measurements among laboratories and to identify causes for observed inconsistency. Eleven laboratories participated in the testing of compact and middle-crack specimens. Opening-load measurements were made for crack growth at two stress-intensity factor levels, three crack lengths, and following an overload. All opening-load measurements were based on the analysis of specimen compliance data. When all of the results reported (from all participants, all measurement methods, and all data analysis methods) for a given test condition were pooled, the range of opening loads was very large--typically spanning the lower half of the fatigue loading cycle. Part of the large scatter in the reported opening-load results was ascribed to consistent differences in results produced by the various methods used to measure specimen compliance and to evaluate the opening load from the compliance data. Another significant portion of the scatter was ascribed to lab-to-lab differences in producing the compliance data when using nominally the same method of measurement. Phillips, Edward P. Langley Research Center RTOP 505-63-01-05...
Download or read book Results of the Second Round Robin on Opening Load Measurement Conducted by ASTM Task Group E24 04 04 on Crack Closure Measurement and Analysis written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A second experimental Round Robin on the measurement of the crack opening load in fatigue crack growth tests has been completed by the ASTM Task Group E24.04.04 on Crack Closure Measurement and Analysis. Fourteen laboratories participated in the testing of aluminum alloy compact tension specimens. Opening-load measurements were made at three crack lengths during constant Delta K, constant stress ratio tests by most of the participants. Four participants made opening-load measurements during threshold tests. All opening-load measurements were based on the analysis of specimens compliance behavior, where the displacement/strain was measured either at the crack mouth or the mid-height back face location. The Round Robin data were analyzed for opening load using two non-subjective analysis methods: the compliance offset and the correlation coefficient methods. The scatter in the opening load results was significantly reduced when some of the results were excluded from the analysis population based on an accept/reject criterion for raw data quality. The compliance offset and correlation coefficient opening load analysis methods produced similar results for data populations that had been screened to eliminate poor quality data. Phillips, E. P. Langley Research Center RTOP 50-63-50-04...
Download or read book Results of the Round Robin on Opening Load Measurement Conducted by ASTM Task Group E24 04 04 on Crack Closure Measurement and Analysis written by National Aeronautics and Space Administration NASA and published by . This book was released on 2018-10-17 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental Round Robin on the measurement of the opening load in fatigue crack growth tests was conducted on Crack Closure Measurement and Analysis. The Round Robin evaluated the current level of consistency of opening load measurements among laboratories and to identify causes for observed inconsistency. Eleven laboratories participated in the testing of compact and middle-crack specimens. Opening-load measurements were made for crack growth at two stress-intensity factor levels, three crack lengths, and following an overload. All opening-load measurements were based on the analysis of specimen compliance data. When all of the results reported (from all participants, all measurement methods, and all data analysis methods) for a given test condition were pooled, the range of opening loads was very large--typically spanning the lower half of the fatigue loading cycle. Part of the large scatter in the reported opening-load results was ascribed to consistent differences in results produced by the various methods used to measure specimen compliance and to evaluate the opening load from the compliance data. Another significant portion of the scatter was ascribed to lab-to-lab differences in producing the compliance data when using nominally the same method of measurement. Phillips, Edward P. Langley Research Center RTOP 505-63-01-05...
Download or read book Results of the Round Robin on Opening load Measurement Conducted by ASTM Task Group E24 04 04 on Crack Closure Measurement and Analysis written by and published by . This book was released on 1989 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 804 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 Results of the Second Round Robin on Opening load Measurement Conducted by ASTM Task Group E24 04 04 on Crack Closure Measurement and Analysis written by E. P. Phillips and published by . This book was released on 1993 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A second experimental Round Robin on the measurement of the crack opening load in fatigue crack growth tests has been completed by the ASTM Task Group E24.04.04 on Crack Closure Measurement and Analysis. Fourteen laboratories participated in the testing of aluminum alloy compact tension specimens. Opening-load measurements were made at three crack lengths during constant Delta K, constant stress ratio tests by most of the participants. Four participants made opening-load measurements during threshold tests. All opening-load measurements were based on the analysis of specimens compliance behavior, where the displacement/strain was measured either at the crack mouth or the mid-height back face location. The Round Robin data were analyzed for opening load using two non-subjective analysis methods: the compliance offset and the correlation coefficient methods. The scatter in the opening load results was significantly reduced when some of the results were excluded from the analysis population based on an accept/reject criterion for raw data quality. The compliance offset and correlation coefficient opening load analysis methods produced similar results for data populations that had been screened to eliminate poor quality data.
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Download or read book A New Method for Opening Load Determination from Compliance Measurements written by D. Kujawski and published by . This book was released on 2005 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of the most popular compliance based methods for determination of the crack opening load is included in the introduction. This review reveals the demand for a noise resistant method that is especially needed in the near-threshold region where a partial crack closure prevails and the existing ASTM method does not calculate the correct opening load. With this in mind, a new technique was developed ('Q' method). It uses integration instead of differentiation of the compliance data. It also accounts for the partial crack closure situations. The derivation of the Q method is discussed together with its relation to the ASTM procedure, and both methods were used to analyze experimental data of 2324-T39 and 7475-T7351 Al alloys tested at 0.1 and 0.9 load ratios. On average, the crack opening load values from the Q method are smaller by the factor of about 2/? in comparison to those obtained from the ASTM procedure.
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 USAF Damage Tolerant Design Handbook written by J. P. Gallagher and published by . This book was released on 1984 with total page 1380 pages. Available in PDF, EPUB and Kindle. Book excerpt: The handbook provides specific background data and justification for the detailed requirements of MIL-A-83444 and provides guidelines and state-of-the-art analysis methods to assist contractor and USAF personnel in complying with the intent of the specification and in solving cracking problems, in general, for metallic aircraft structures. Cf. Report Documentation Page.
Download or read book Mechanics of Composite Materials and Structures written by Carlos A. Mota Soares and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compact presentation of the foundations, current state of the art, recent developments and research directions of all essential techniques related to the mechanics of composite materials and structures. Special emphasis is placed on classic and recently developed theories of composite laminated beams, plates and shells, micromechanics, impact and damage analysis, mechanics of textile structural composites, high strain rate testing and non-destructive testing of composite materials and structures. Topics of growing importance are addressed, such as: numerical methods and optimisation, identification and damage monitoring. The latest results are presented on the art of modelling smart composites, optimal design with advanced materials, and industrial applications. Each section of the book is written by internationally recognised experts who have dedicated most of their research work to a particular field. Readership: Postgraduate students, researchers and engineers in the field of composites. Undergraduate students will benefit from the treatment of the foundations of the mechanics of composite materials and structures.
