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- W1565144842 abstract "For low-to-intermediate rates of mechanical loading, plastic deformation is controlled by thermal activation or mechanical penetration of dislocations through barriers. These barriers can be solute atoms, impurities, or, in the case of very pure materials, other dislocations. At some point between intermediate strain rates (10 - 104 s−1) and the higher strain rates (105 - 107 s−1) associated with weak-shock compression, the plastic deformation process makes a transition from being dominated by stress-assisted thermal activation to being controlled by the time it takes a mobile dislocation to get from one barrier to the next: this latter time depends on the effective stress and viscous-drag force provided by the perfect lattice. Some of the models that describe this process are reviewed, along with various hardening mechanisms. Distinction is made between simple rate-dependent models (in which the shear stress depends on the current plastic strain rate and plastic strain) and path-dependent models (in which the shear stress depends on the current plastic strain rate and all past history through one, or more, internal-state variables). A way in which shock-wave data can be used to extend intermediate strain-rate models into the viscous-drag regime is described." @default.
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- W1565144842 date "1992-01-01" @default.
- W1565144842 modified "2023-09-24" @default.
- W1565144842 title "DYNAMIC PLASTICITY IN TRANSITION FROM THERMAL ACTIVATION TO VISCOUS DRAG" @default.
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- W1565144842 doi "https://doi.org/10.1016/b978-0-444-89732-9.50084-4" @default.
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