2. Elastoplastic indentation
2.1 Hollow cavity expansion model
Historically, this model was proposed to account for fairly early experimental observations such as those shown in figure 5 . The metallurgical investigation of the plastic deformation field reveals the following facts:
the deformation field extends far below the surface, contrary to the predictions of RPP body deformation models ;
isodeformation curves are semicircles centered on the end of the indentor;
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Elastoplastic indentation
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