Recent Improvements to the ASTM-type Ultrasonic Reference Block System PDF Download
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Author: Daniel J. Chwirut
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Daniel J. Chwirut
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages : 0
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Recent activities aimed toward improving the ASTM-type ultrasonic reference block system are described. On the aluminum block system (ASTM E127 and NBS TN 924), efforts were focused on better definition of the measurement equipment (transducer and instrument), the implementation of a Measurement Assurance Program and Loaner Block Service, and modeling of the distance-amplitude relationship. It is shown that a large increase in the precision of reference block readings is easily achievable by implementing simple changes and controls in the measurement procedure. On steel and titanium blocks (e.g. ASTM E-428), efforts were directed toward quantifying the extent of reproducibility possible among blocks fabricated by both conventional drilling and by diffusion bonding. Reasonable reproducibility is achievable by both, with the diffusion-bonding process offering both advantages and disadvantages. (Author).
Author: D. G. Eitzen
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ISBN:
Category :
Languages : en
Pages : 86
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A program to improve the quality, reproducibility and reliability of nondestructive testing through the development of improved ASTM-type ultrasonic reference standards is described. Reference blocks of aluminum, steel, and titanium alloys are to be considered. Equipment representing the state-of-the-art in laboratory and field ultrasonic equipment was obtained and evaluated. RF and spectral data on ten sets of ultrasonic reference blocks have been taken as part of a task to quantify the variability in response from nominally identical blocks. Techniques for residual stress, preferred orientation, and micro-structural measurements were refined and are applied to a reference block rejected by the manufacturer during fabrication in order to evaluate the effect of metallurgical condition on block response. New fabrication techniques for reference blocks are discussed and ASTM activities are summarized.
Author: D. J. Chwirut
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Category : Ultrasonic transducers
Languages : en
Pages : 48
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Category : Calibration
Languages : en
Pages : 120
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Category : Aeronautics
Languages : en
Pages : 994
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Author: United States. National Bureau of Standards
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Category : Weights and measures
Languages : en
Pages : 128
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Calibration
Languages : en
Pages : 122
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Author: United States. National Bureau of Standards. Office of Measurement Services
Publisher:
ISBN:
Category : Calibration
Languages : en
Pages : 124
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 368
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