The pronounced anisotropy of pultruded material permits the propagation of a diametral crack along its length by torsion. It is shown that the torque required to propagate this crack is independent of the crack length. Accordingly, the fracture energy of pultruded material is easily approximated by a simple torsion testing system and can provide a measure of the glass-resin interaction and bonding.
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References
1.
Lockwood, P.A., Hoover, W.C. and Gauchel, J.V., "Mechanical Evaluation of Pultruded Rod Using Flexural Shear Strength Criterion," 38th SPI Tech. Conf., Sect. 11-E (1983).
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Outwater, J.O. and Gerry, D.J., "On the Fracture Energy of Glass,"U.S. Naval Research Laboratory Report, Contract NONR 3219 (01) (1) (1966).
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Roark, R.J., "Formulas for Stress and Strain,"4th Ed., McGraw-Hill Book, New York (1965 ).
