Side-contact of sharp indenters, including the effects of friction

When a sharp-edged indenter is pressed into a half-plane material in the half-plane is displaced and ‘laps around’ the edges of the punch, possibly making contact with the side faces. This phenomenon is quantified within (coupled) half-plane theory, and applied first to an idealised indenter having the cross section of a trapezium, and then to a semi-infinite indenter. The latter allows an asymptotic form to be found which, through a generalised stress intensity factor may be collocated into the edge of any notionally sharp-edged indentation problem.