Steady state viscoelastic crack growth in a pure shear sample
Chung-Yuen Hui
1Sibley School of Mechanical and Aerospace Engineering, Field of Theoretical & Applied Mechanics,
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A classical problem in viscoelastic fracture is the steady-state growth of a crack under small-scale creeping (SSD) conditions. Under SSD, the size of the damage zone is assumed to be much smaller than the specimen dimensions, allowing finite-size effects to be neglected and justifying the use of an elastic K-field at infinity. A well-known limitation of this framework is that it predicts an unrealistically small dissipation zone.
In this talk, I use an exact closed-form solution for a Mode III crack in a pure-shear specimen to examine what occurs when finite-specimen effects are included and the damage zone becomes comparable to—or even larger than—the specimen dimensions (LSD). The full-field solution enables direct computation of stress, strain, and viscoelastic dissipation fields, providing a clear view of how damage interacts with viscoelastic energy loss. We identify a new dimensionless damage parameter (ranging from 0 to 1) that governs the transition from SSC to LSD, offering a unified framework for understanding fracture behavior across these regimes.
Chung-Yuen Hui
1Sibley School of Mechanical and Aerospace Engineering, Field of Theoretical & Applied Mechanics,
E-mail:
A classical problem in viscoelastic fracture is the steady-state growth of a crack under small-scale creeping (SSD) conditions. Under SSD, the size of the damage zone is assumed to be much smaller than the specimen dimensions, allowing finite-size effects to be neglected and justifying the use of an elastic K-field at infinity. A well-known limitation of this framework is that it predicts an unrealistically small dissipation zone.
In this talk, I use an exact closed-form solution for a Mode III crack in a pure-shear specimen to examine what occurs when finite-specimen effects are included and the damage zone becomes comparable to—or even larger than—the specimen dimensions (LSD). The full-field solution enables direct computation of stress, strain, and viscoelastic dissipation fields, providing a clear view of how damage interacts with viscoelastic energy loss. We identify a new dimensionless damage parameter (ranging from 0 to 1) that governs the transition from SSC to LSD, offering a unified framework for understanding fracture behavior across these regimes.
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