Evidence Against Oriented Structure in Glass Fibres

JSGT 1950 V34 T063-T068

Heat-treated glass fibres are shown experimentally to undergo contraction equally in the longitudinal and cross-sectional directions of the fibre, thus showing them to consist of isotopic material and without appreciably stronger longitudinal than transverse bonds. Determination of fibre strength yielded approximately the same results whether made by tensile or torsion tests, that is, under stresses applied longitudinally or at 45° to the length; and this being so, the so-called Griffith flaws cannot be oriented in any one direction.

W. H. Otto & F. W. Preston