Abstract
Recent micro- and nano-indentation experiments have shown strong indentation size effects at the micron and sub-micron scales. Classical plasticity theories cannot explain the indentation size effect because their constitutive models possess no intrinsic material lengths. The Mechanism-based Strain-Gradient (MSG) plasticity theory and its simplified version, the Conventional theory of Mechanism-based Strain-Gradient plasticity (CMSG), have been established from the Taylor dislocation model and have successfully explained the indentation size effect. This paper provides a review of these theories and their applications to study the indentation of face- and body-centred-cubic metals and thin films on hard or soft substrates.
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