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Delayed Failure - The Griffith Problem for Linearly Viscoelastic Materials

Knauss, W. G. (1970) Delayed Failure - The Griffith Problem for Linearly Viscoelastic Materials. International Journal of Fracture, 6 (1). pp. 7-20. ISSN 0376-9429.

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The unstable growth of a crack in a large viscoelastic plate is considered, within the framework of continuum mechanics. Starting from the local stress and deformation fields at the tip of the crack, a non-linear, first order differential equation is found to describe the time history of the crack size if the stress applied far from the crack is constant. The differential equation contains the creep compliance and the intrinsic surface energy of the material. The surface energy concept for viscoelastic materials is clarified. Inertial effects are not considered, but the influence of temperature is included for thermorheologically simple materials. Initial crack velocities are given as a function of applied load in closed form, as well as a comparison of calculated crack growth history with experiments. Above a certain high stress, crack propagation ensues at high speeds controlled by material inertia while at a lower limit infinite time is required to produce crack growth. Thus an upper and lower limit criterion of the Griffith type exists. For rate insensitive (elastic) materials the two limits coalesce and only the brittle fracture criterion of Griffith exists. The implications of these results for creep fracture in metals and inorganic glasses are examined.

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Additional Information:© 1970 Wolters-Noordhoff Publishing. (Received January 2, 1969; in revised form November 6, 1969) This work was supported by the National Aeronautics and Space Administration Research Grant No. NGL-05-002-005 GALCIT 120.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55937
Deposited By: George Porter
Deposited On:19 Mar 2015 23:33
Last Modified:03 Oct 2019 08:09

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