![]() ![]() 95,96 However, the reliability of the even more difficult shear stress calculation becomes questionable, in the inelastic range in particular. An alternative is to test specimens of rectangular cross-section. One distinct limitation in testing solid circular rods is that it is only practical to fabricate and test unidirectional composites. ![]() Thus calculation of the maximum stress at shear failure is more difficult. The variation is linear when the material is in the linear range, but the slope of the shear stress versus radius curve decreases with radius in the inelastic range. Unlike for a thin-walled tube, the shear stress across the radius varies from zero at the center (axis of twist) to a maximum at the outer surface. Rods can be molded to finished dimensions, or machined from thick fiat laminates. 94 Their principal attributes are that they are relatively simple to fabricate, and very rugged, both in terms of handling and gripping. A 6-mm-diameter rod, perhaps 100 mm long, is a very viable specimen size, although rods as small as 3 mm in diameter can be tested. Solid rods of circular cross-section, with the reinforcement oriented axially, are a viable alternative to thin-walled tubes, and also determine the in-plane shear modulus and strength. Whitney, in Comprehensive Composite Materials II, 2018 7.2.7.3.1.2 Solid rods Testing, Nondestructive Evaluation and Structural Health MonitoringÄonald F. ![]()
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