A study of microindentation hardness tests by mechanism-based strain gradient plasticity
- Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
- Division of Mechanics and Computation, Stanford University, Stanford, California 94305 (United States)
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States)
- Ford Research Laboratory, P.O. Box 2053, MD 3135/SRL, Dearborn, Michigan 48121 (United States)
We recently proposed a theory of mechanism-based strain gradient (MSG) plasticity to account for the size dependence of plastic deformation at micron- and submicron-length scales. The MSG plasticity theory connects micron-scale plasticity to dislocation theories via a multiscale, hierarchical framework linking Taylor's dislocation hardening model to strain gradient plasticity. Here we show that the theory of MSG plasticity, when used to study micro-indentation, indeed reproduces the linear dependence observed in experiments, thus providing an important self-consistent check of the theory. The effects of pileup, sink-in, and the radius of indenter tip have been taken into account in the indentation model. In accomplishing this objective, we have generalized the MSG plasticity theory to include the elastic deformation in the hierarchical framework. (c) 2000 Materials Research Society.
- OSTI ID:
- 20217683
- Journal Information:
- Journal of Materials Research, Vol. 15, Issue 8; Other Information: PBD: Aug 2000; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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