Some Viscoelastic Crack Growth Relations for Orthotropic and Prestrained MEdia.
TEXAS A AND M UNIV COLLEGE STATION MECHANICS AND MATERIALS RESEARCH CENTER
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Equations are developed for predicting opening and sliding modes of crack growth along planes of geometric symmetry in viscoelastic orthotropic media with and without large prestrains. Except for the small zone of failing material at the crack tip, the body is assumed to be linearly viscoelastic with respect to the changes in stress and strain which occur during crack propagation. Results obtained previously for isotropic media are first reviewed, and then a relation is derived for predicting crack tip velocity in an orthotropic body in plane strain included is a numerical example using constitutive properties of a fiber-reinforced plastic. Extension to fracture of prestrained media and crack growth between certain types of dissimilar media is then made. Finally, it is argued that these crack velocity relations can be employed in plane stress problems and in many three-dimensional cases, and, with a small change, can be used to predict the time of fracture initiation. Author
- Laminates and Composite Materials