Extending the range of constant strain rate nanoindentation testing

Abstract

Abstract

Progressive changes in crystallographic textures of biominerals generate functionally graded ceramics

“…Furthermore, we experimentally characterized intraprismatic crack initiation by nano-indentation, which probes length scales up to a few micrometers. [77][78][79] Displacement bursts in the continuous load-displacement Please do not adjust margins Please do not adjust margins curves coincided with the appearance of visible cracks and therefore resulted from crack initiation (Figure S4). The probability distributions of crack initiation as a function of the indentation force demonstrate that the compliant prisms of Group 1, which dominate the shell exterior, consistently require greater indenter loads to initiate fracture than the stiffer prisms of Group 2 (Figure S4e).…”

Measurement of hardness and elastic modulus by load and depth sensing indentation: Improvements to the technique based on continuous stiffness measurement

“…for researchers to measure mechanical properties using nanoindentation-based techniques at much higher rates or shorter test durations [16][17][18][19]. Hence, at this juncture, it is instructive to revisit the currently used test methodologies in light of recent advances in instrumentation, not only to assess their applicability at the fast testing rates, but also to potentially improve upon the precision and accuracy of the measurements by leveraging some of the advances in electronics.…”

“…A brief discussion of previous recommendations [12] for hardness and modulus measurements is presented along with some recent work that improves upon them. In addition, new issues that arise in fast testing will be presented along with possible solutions that may facilitate even faster testing [16,17,[20][21][22].…”

“…One of the most important issues that needs to be carefully considered while performing CSM based indentation testing is plasticity error, as first reported by Merle et al [16,17,20]. This error arises when the mean value of the load increases in each CSM cycle, thereby resulting in the amplitude of the displacement oscillation being influenced not by just an elastic response but also by plasticity.…”

High strain rate in situ micropillar compression of a Zr-based metallic glass

“…Though recently, the authors of this study reported the micromechanical properties of fused silica and 3D-printed polymer structures at strain rates up to 1000 s −1 using a piezobased testing platform [15,16]. There are also a small number of other recent key studies on copper micropillar compression conducted at strain rates up to 100 s −1 and nanoindentation of coarse-grained aluminium and nanocrystalline nickel performed at indentation strain rates up to 100 s −1 [17,18].…”