The Development Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites
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The Development Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites
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Author : A. W. Schultz
language : en
Publisher:
Release Date : 1971
The Development Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites written by A. W. Schultz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Nondestructive testing categories.
Development And Application Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites
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Author : C. H. Hastings
language : en
Publisher:
Release Date : 1973
Development And Application Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites written by C. H. Hastings and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Boron compounds categories.
This report concerns itself with a detailed evaluation and development of ultrasonic interval velocity measurement technique. Results indicate that it is a practical and powerful tool applicable to the evaluation of boron/epoxy laminates for structural hardware components. Best results are achieved in the 0 and 90 degree directions of the laminates studied. Unbalanced laminates lead to greater errors in the 45 degree direction. Measurements off-angle with respect to reinforcing filaments do not now seem to be reliable. Based on interval velocity measurements, correlations have been developed for modulus calculation and tensile strength prediction. Accuracies appear to be better than tensile tests for modulus (less scatter) and as good as tensile tests for strength determination. Yield strengths did not appear to be predictable because of excessive scatter in the densile data. Degradation of boron/epoxy laminates studied, because of prior tensile loading did not exist. (Author-PL).
Development And Applications Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites
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Author : A. W. Schultz
language : en
Publisher:
Release Date : 1971
Development And Applications Of Nondestructive Methods For Predicting Mechanical Properties Of Advanced Reinforced Nonmetallic Composites written by A. W. Schultz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
A detailed evaluation of the interval velocity, one side access technique was conducted and results indicate that it has, at its present stage of development, a limited usefulness for routinely measuring relative values of polar velocity, and hence polar modulus, for many fiber reinforced composites including boron/epoxy. Although the usefulness of nondestructive modulus measurements for predicting elastic modulus and ultimate strength for fiber composites has been confirmed, these studies strongly indicate that this capability can be extended to include all fiber configurations at any polar orientation. It has been shown that ultrasonic modulus affords a useful means for predicting yield strength in these boron/epoxy composites, defined here as the point of departure from linearity on the stress-strain curve. Ultrasonic velocity measurements performed at various frequencies between 0.5 and 5.0 MHz following boron/epoxy specimen loadings to successively higher strain levels only suggest, that 0.5 MHz measurements made in the thickness direction and possibly the length direction may be correlatable with the onset, or existence of degradation. Cursory analysis of ultrasonic energy transmission spectra at various frequencies suggests that the technique is very sensitive to changes in material characteristics, but its usefulness may be limited by the influence of extraneous variables. Work will continue using these techniques, as well as other in the pursuit of detecting degradation through non- destructive means. (Author, modified-PL).
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date :
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Aeronautics categories.
Star
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Author :
language : en
Publisher:
Release Date : 1973
Star written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Aeronautics categories.
Extractives In Eastern Hardwoods
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Author : John W. Rowe
language : en
Publisher:
Release Date : 1979
Extractives In Eastern Hardwoods written by John W. Rowe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The Development Of Nondestructive Methods For The Quantitative Evaluation Of Advanced Reinforced Plastic Composites
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Author : A. W. Schultz
language : en
Publisher:
Release Date : 1970
The Development Of Nondestructive Methods For The Quantitative Evaluation Of Advanced Reinforced Plastic Composites written by A. W. Schultz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Nondestructive testing categories.
This final report documents the completion of the fifth year of a continuing study concerned with the development of nondestructive testing techniques for quantitatively evaluating advance fiber- reinforced plastic composites. Five boron/ epoxy panels, one plain weave carbon/carbon panel, and a 3-D quartz/phenolic ssphere were nondestructively and destructively tested for mechanical properties behavior and physical properties characteristics. It was the purpose of this program to: (a) ESTABLISH PREDICTIVE CORRELATIONS BETWEEN ULTRASONICALLY-DETERMINED MODULUS VALUES AND DESTRUCTIVELY-MEASURED TENSILE, COMPRESSION, FLEXURE AND SHEAR MODULUS AND STRENGTH VALUES FOR THE 2-D composites; (b) relate 2- D and 3-D ultrasonic polar modulus values with apreviously-derived micro-mechanics- based theory for generating polar modulus values; (c) demonstrate the feasibility of applying a recently-conceived 6Interval Velocity Technique6 to reinfroced composites; (d) demonstrate the capability of a nondestructive, multiple-energy, gamma- ray radiometric technique for predicting mixture concentrations in boron/epoxy composites; and (e) investigate the use of width-and across-ply measurements of ultrasonic velocity for predicting the mechanical modes of failure occurring in composite test specimens. (Author, modified-PL).
Technical Abstract Bulletin
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Author :
language : en
Publisher:
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Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.
Non Destructive Testing Of Fibre Reinforced Plastics Composites
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Author : J. Summerscales
language : en
Publisher: Springer Science & Business Media
Release Date : 1990-09-30
Non Destructive Testing Of Fibre Reinforced Plastics Composites written by J. Summerscales and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-09-30 with Technology & Engineering categories.
Nbs Special Publication
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Author :
language : en
Publisher:
Release Date : 1980
Nbs Special Publication written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Weights and measures categories.