The mechanics of size-dependent indentation

摘要: Indentation tests at scales on the order of one micron have shown that measured hardness increases significantly with decreasing indent size, a trend odds size-independence implied by conventional plasticity theory. In this paper, strain gradient theory is used to model materials undergoing small-scale indentations. Finite element implementation as it pertains indentation modeling briefly reviewed. Results are presented for frictionless conical A strong effect including gradients in constitutive description found increasing factor two or more over relevant range behavior. The results investigate role primary length parameters study indicates may be most effective test measuring parameters.