## Energy criterion for initiation and spread of fracture in viscoelastic solidsEngineering Experiment Station, South Dakota State University, 1968 - Fracture mechanics - 130 pages |

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### Contents

Energy criterion Latent period preceding fracture | 4 |

Equation of motion An asymptotic solution Initial velocity | 13 |

Examples of integration of the equation of motion Evaluation of the lifetime of a cracked element | 18 |

8 other sections not shown

### Common terms and phrases

2Trrdr applied load brittle Bueche Continuum Mechanics correspondence principle crack tip creep compliance delayed fracture denotes derived elastic energy balance epoxy resin P52 equation 3.4 equation of motion equivalence principle evaluate flaw fracture in viscoelastic fracture initiation function GALCIT geometry Glass Temperature glass transition temperature Griffith stress Halaunbrenner and Kubisz history of loading immediate fracture increment incubation period initial crack length initial velocity integral kinetic energy Knauss 37 L(ln large plastic deformations linear viscoelastic solid material properties obtained penny shaped crack plastic zone polymers Pq/Pg Pq/Pq prior to fracture ratio regions adjacent residual displacement result rheological Schapery Sendai shown in Fig slow crack propagation slow propagation solution specific surface energy spherical void stages of fracture standard linear solid step load condition strain energy temperature tensile strength term terminal velocity ttE g universal curve universal equation viscoelastic displacement vp vp Wnuk and Knauss yield stress