Affiliation:
1. Bureau Standards of the U. S. Department of Commerce
Abstract
An instrument is described with which the flexural work, flexural resilience, and flexural hysteresis of cloth, paper, sheet rubber, and similar materials can be evaluated. A pair of test specimens of standard dimensions are mounted in opposite angles formed by two vertical intersecting plates, one of which is fixed and the other movable on a spindle. The work done in folding the specimens to various angles between the plates, the work recovered when they are allowed to unfold, and the work lost are measured. These quantities are a measure respectively of flexural work, flexural resilience, and flexural hysteresis of the specimens. They are related to the stiffness and crease-ability of cloth and affect the sensations which contribute to the psychological qualities of "handle" or "feel'' and the "drape" of fabrics. Typical results are given.
Reference5 articles.
1. H.J. McNicholas and A.F. Hedrick. The Structure and Properties of Parachute Cloths. National Advisory Committee for Aeronautics Tech. Note, No. 335, 33 pp. 1930.
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