Indentation of elastic solids with a rigid Vickers pyramidal indenter

Rate dependence of indentation size effects in filled silicone rubber

“…We believe however that the issue of quantification/characterization of microscopic phases and corresponding possibly present anisotropy would be quite complicated and beyond the scope and intent of this work. Given the fact, however, that such an indentation size effect in a similar indentation depth range has also been found in [Lim and Chaudhri 2006] for highly cross-linked polydimethylsiloxane, this may indicate that the notion suggested in Section 4 is nevertheless valid for the silicone rubber used in this work as well as the highly cross-linked polydimethylsiloxane of [Lim and Chaudhri 2006]. The possible differences between the polydimethylsiloxane of [Lim and Chaudhri 2006] and the polymer blend used here fabricated with fumed silica reinforced vinyl terminated polydimethylsiloxane remains an open question which is not considered in this article.…”

“…Using conical indenter tips the effect of the indenter tip curvature is of more relevance at submicron indentation depths [Qu et al 2004] than the here-considered range of 30-300 microns. While rate effects were not investigated in [Lim and Chaudhri 2006] it was found that for a silicone rubber with a higher cross-link density elevated hardnesses were also observed for small indentation depths. As opposed to [Lim and Chaudhri 2006], the silicone rubber material used in this work is not a pure polydimethylsiloxane as described in Section 2.…”

“…While rate effects were not investigated in [Lim and Chaudhri 2006] it was found that for a silicone rubber with a higher cross-link density elevated hardnesses were also observed for small indentation depths. As opposed to [Lim and Chaudhri 2006], the silicone rubber material used in this work is not a pure polydimethylsiloxane as described in Section 2. The silicone rubber used here is more of a polymer blend, and that has not been taken into consideration in the analysis and evaluation given in Section 4.…”

“…Such elevated hardnesses at small indentation depths have also been observed in polymers [Briscoe et al 1998;Chong and Lam 1999;Tjernlund et al 2004;Lim and Chaudhri 2006; but, in comparison to metals, for polymers these effects are not well understood. An understanding of size-dependent deformation behavior is important not only for small components in MEMS/NEMS (micro/nano-electromechanical systems), but also for the development of advanced material systems and composite materials with small material phases and other applications such as sealants, gaskets [Tan et al 2007], and adhesives [Han et al 2007b].…”

Evaluation of Sinking-In and Cracking Behavior of Soda-Lime Glass under Varying Angle of Trigonal Pyramid Indenter

“…It was considered that the bowed-in shape results from the pincushioning effect by the ridges of Vickers indenter (Lim and Chaudhri, 2006). Lim and Chaudhri attributed this bowing-in to the pincushioning of an elastic body, where the depth of contact is greater at the ridges of the indenter than the depth of the points between ridges.…”