NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Anelastic deformation of boron fibersThe flexural deformation behavior of vapor-deposited boron fibers is investigated in the temperature range from 100 to 1100 K by stress-relaxation and internal friction methods. Strong thermally-activated anelasticity is uniquely observed, and no evidence of plasticity is found up to surface strains of 0.006. The parameters governing the relaxation processes within the anelastic spectra of untreated and annealed fibers are determined and correlated with the results of X-ray structural studies to develop preliminary models for the possible causes of boron's anelasticity. The large relaxation strengths of the dominant Ia processes together with their relaxation times and energies are shown to suggest a sliding mechanism between certain basic structural subunits common to both the beta-rhombohedral and vapor-deposited boron structures.
Document ID
19750051798
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dicarlo, J. A.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1975
Subject Category
Composite Materials
Accession Number
75A35870
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available