Torsional velocity measurements in wire, with application to metal‐matrix composites
作者:
H. M. Frost,
J. H. Prout,
Robert W. Reed,
期刊:
Journal of Applied Physics
(AIP Available online 1982)
卷期:
Volume 53,
issue 6
页码: 4218-4225
ISSN:0021-8979
年代: 1982
DOI:10.1063/1.331246
出版商: AIP
数据来源: AIP
摘要:
A technique is described for measuring torsional wave velocity in (nonferromagnetic) wire with diameters of less than 1 mm. Transduction is noncontacting, via Lorentz forces acting across a gap between transducer and wire, so that velocity can be ’’scanned’’ along the length of the wire. A double‐receiver approach permits the scan to be made in a ’’point‐by‐point’’ fashion. The wires are a metal‐matrix composite of 6061 aluminum and pitch mesophase graphite. Some data are presented, together with a discussion of the effects of metal‐matrix‐composite parameters, such as graphite content and porosity, on torsional velocity. An extrapolation of our metal‐matrix‐ composite data yields a value forc44, of the graphite fiber, that was within 1% of a value determined from data of Fischbach and Scrinivasagopalan. Good predictions of experimental results were obtained through use of theory of Hashin and of Achenbach and Herrmann. Some differences, and their implications, between torsional and longitudinal waves propagating in metal‐matrix‐composite wire are described.
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