Dynamic Fracture Criteria

The dynamic fracture of a double cantilever beam of fiber-reinforced material is discussed. The material is modeled by assuming that the fibers are inextensible and continuously distributed. The examples considered reduce to the solution of the wave equation on a time-dependent interval; the method of characteristics is used. Two fracture criteria are used to calculate the crack speed. One of these criteria is the energy release rate commonly used in elastic fracture mechanics. In the present model some fibers can carry a finite force; the second criterion is based on the force in the fiber through the crack tip. Three simple examples are given to illustrate the model.

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Dynamic Fracture Criteria Evaluation of Bridge Structural Steel

The Baltic Journal of Road and Bridge Engineering ◽

10.3846/bjrbe.2011.12 ◽

2011 ◽

Vol 6 (2) ◽

pp. 91-95 ◽

Cited By ~ 2

Author(s):

Antanas Žiliukas ◽

Marius Gintalas

Keyword(s):

Structural Steel ◽

Dynamic Fracture ◽

Fracture Criteria

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A Model for Dynamic Fracture

Journal of Mechanical Engineering Science ◽

10.1243/jmes_jour_1971_013_032_02 ◽

1971 ◽

Vol 13 (3) ◽

pp. 200-204 ◽

Cited By ~ 9

Author(s):

B. Steverding ◽

A. H. Werkheiser

Keyword(s):

Differential Equation ◽

Dynamic Fracture ◽

Incubation Time ◽

Fracture Criterion ◽

Elevated Temperatures ◽

High Stress ◽

Fracture Criteria ◽

Loaded Material ◽

Long Time ◽

Static Fracture

It is shown that the dynamic fracture criterion for metals is equivalent to the failure criterion of a Voigt body containing a non-Newtonian dashpot. Integration of the differential equation leads to the concept of a critical incubation time for fracture. Contrary to static fracture criteria, not only is a sufficiently high stress necessary but this stress has also to be present for a sufficiently long time, so that large stresses afford small duration and vice versa. Some consequences of the dynamic fracture law are applied to dynamic metal behaviour at elevated temperatures, as well as to the size of the shock loaded material.

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