Plastic dynamics and brittle vs. ductile failure in noncrystalline solids
- Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
The authors simulate fracture in two amorphous solids with different interparticle potentials. These small changes in potential result in significant changes in dissipation near the crack tip. While one might expect these effects to arise from a change in flow stress, measurements reveal this is not the case. To understand why, they consider the relationship between crack dynamics, rate-dependent plasticity, and molecular-level structures in the glassy solid. In particular they discuss the macro-scale continuum theory of dynamic brittle fracture in a viscoplastic solid developed by Freund and Hutchinson and the meso-scale theory of viscoplasticity proposed by Falk and Langer. The authors further consider a simplified model on the molecular scale as a first-step toward the construction of first-principles models of dynamic plasticity and the brittle ductile transition in noncrystalline materials.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- FG03-84ER45108
- OSTI ID:
- 364059
- Report Number(s):
- CONF-981104--
- Country of Publication:
- United States
- Language:
- English
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