Indentation of metals by a flat-ended cylindrical punch

Abstract

The paper reviews the fundamentals of indentation theory for punches with cylindrical geometry, presents a deep-indentation finite element (FE) simulation and discusses an experimental technique for flat-ended cylindrical indentation. This technique is based on the use of cylindrical punches with diameters up to 1 mm and allows pressure-penetration curves to be drawn from which yield stress and elasticity modulus can be determined. Several materials have been tested including pure metals, steels and refractory alloys; yield stress has been determined and compared with literature values. By testing at different temperatures it was also possible to determine the ductile-to-brittle transition temperature (DBTT) for some alloys that show such phenomenon.

Flat-Top Cylinder Indenter Examination of Duplex Stainless Steel 2205 after Different Heat Treatments

“…During punching the applied load (L) and the penetration depth (h) are measured and pressure (p) vs. penetration depth (h) curves are then obtained. As shown in Figure 1 for a martensitic steel [27], after an initial elastic stage (up to p L ) three plastic stages are observed. The first one after the elastic range ends at p Y , is almost linear and shows an imprint with sharp edges.…”

“…FIMEC allows the examination at the local scale, in a non-destructive way, of mechanical parts of complex geometry, including MZ and HAZ in welded joints [27]. However, unlike microand nano-indentation tests, the imprints are large enough to involve thousands of grains, so that the FIMEC measurements are representative of the behavior of the bulk material.…”

High temperature indentation creep tests on anhydrite – a promising first look

“…Stress concentration is predicted around the circular edge of the indenter (e.g. Riccardi and Montanari, 2004), leading to the highest deformation rates. After a volume element has passed the indenter edge, deformation ceases, and the hitherto-developed microstructure remains largely preserved due to mechanical decoupling across the crevasse (Figs.…”

“…Such tests provide information on rheology, deformation mechanisms, and related microstructures of materials (e.g. Yue et al, 2001;Li, 2002;Dorner et al, 2003;Riccardi and Montanari, 2004). Dorner et al (2003) performed indentation creep tests on an engineering alloy with a complex microstructure and demonstrated that the creep parameters obtained from indentation creep and uniaxial creep Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Investigation of Cement Matrix Compositions of Nanosilica Blended Concrete

“…The indenter tip penetration depth is measured during loading and unloading with a parallel plate capacitor that has sub-nanometer resolution [13]. The most common indenters include the three-sided pyramid (Berkovich) indenter, spherical indenter [14] and the flat-ended (punch) indenter [15]. The Berkovich indenter was successfully used for extracting the mechanical characteristics of individual microstructural phases in the cement paste [16].…”