Nanoscale evolution of stress concentrations and crack morphology in multilayered CrN coating during indentation: Experiment and simulation

Modeling the nanoindentation response of silicate glasses by peridynamic simulations

“…As expected, we observe that indentation induces a state of hydrostatic compression (negative stress) within the bulk of the glass. The compressive nature of the hydrostatic stress is consistent with previous FEM findings 68 . Such hydrostatic compressive stress is likely to result in the appearance of permanent densification in glasses featuring an open structure (e.g., SiO 2 ), albeit to a lower extent in glasses exhibiting a compact atomic network 20 .…”

“…The compressive nature of the hydrostatic stress is consistent with previous FEM findings. 68 Such hydrostatic compressive stress is likely to result in the appearance of permanent densification in glasses featuring an open structure (e.g., SiO 2 ), albeit to a lower extent in glasses exhibiting a compact atomic network. 20 Moreover, we observe the existence of some localized region exhibiting high von Mises shear stress.…”

Influence of Gradient Residual Stress and Tip Shape on Stress Fields Inside Indented TiN Hard Coating

“…This is much in contrast to the latter, where the only cracks that formed beneath the indenter imprint are confined to a shallow region beneath the film's surface, as shown in Figure 4b, although the applied load was even slightly higher. These cracks have a very different morphology and rather resemble those observed during indentation of a CrN multilayer coating using a very similar setup and methodology by Ecker et al, [ 10 ] as they only reach a limited depth and exhibit a step‐like serrated shape. Furthermore, the vertical crack opening observed here is much larger than the horizontal one, which is so small that it is indeed difficult to see at all, as indicated by the arrows in Figure 4b.…”

“…To address this drawback, cross-sectional scanning X-ray nanodiffraction (CSnanoXRD) using synchrotron radiation and a dedicated in situ indentation setup has recently been used successfully for experiments on various ceramic thin film samples. [9][10][11] Another classical approach used in indentation modeling is the combination with electron microscopical examination of cross sections postmortem, that is, ex situ after the a nanoindentation experiment. Also in this case, CSnanoXRD has proved to be a useful tool, to properly understand deformation phenomena that took place under the indenter imprint and to properly attribute them to the stress levels present in different parts of the indented sample region.…”

Light microscopy‐based elastography for the mechanical characterization of zebrafish somitogenesis

“…We modeled the force distribution assuming that an embryo is a planestress, flat disc-shaped plate with the same thickness as the zebrafish trunk and the tweezer contact area was rectangular with the same thickness. For the ectoderm and the somite analysis, we assumed that the force distribution was similar to the case of wedge indentation reported in [38,39] and modeled the distribution using the following equations:…”