Results 241 to 250 of about 2,129,467 (285)

Shape Effects of Indenter on the Depth-Sensing Indentation

Advanced Materials Research, 2010
It is revealed that the conventional reduced modulus used in depth-sensing indentation tests is invalid for a flat-ended cylindrical indenter due to the fact that the contact area during the loading is a constant irrelative to load. The load-displacement curve of flat punch is related to the length of the punch and the ratio of the elastic modulus of ...
Xin Yong Shi, Li Zhong Liu, Yi Wang Bao
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An Indentation Fatigue Depth Propagation Law

Scripta Materialia, 2009
Using both experimental and numerical studies, we show that, upon cyclic indentation with a flat cylindrical indenter, the steady-state rate of indentation depth propagation can be well characterized by a simple power-law function of the stress intensity range and the maximum stress intensity, which is qualitatively similar to the steady-state growth ...
Xi Chen, Baoxing Xu, Zhufeng Yue
exaly   +2 more sources

Depth-sensing indentation measurements with Vickers and Berkovich indenters

Journal of Materials Research, 1998
Depth-sensing indentation measurements are performed with two different Vickers indenters and one Berkovich indenter. The sample materials were mirror polished Ag, Al, Au, Ni, and Ti samples. From the load-indentation depth data, the conventional hardness plots as well as the first derivative are calculated.
B. Rother, A. Steiner, D. A. Dietrich, H. A. Jehn, J. Haupt, W. Gissler   +5 more
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Indentation load relaxation experiments with indentation depth in the submicron range

Journal of Materials Research, 1990
Indentation load relaxation (ILR) experiments with indentation depths in the submicron range are described. Under appropriate conditions, the ILR data are found to yield flow curves of the same shape as those based on conventional load relaxation data.
W. R. LaFontaine, B. Yost, R. D. Black, C-Y. Li   +3 more
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Determination of indenter tip geometry and indentation contact area for depth-sensing indentation experiments

Journal of Materials Research, 1998
The phenomena of pile-up and sink-in associated with nanoindentation have been found to have large effects on the measurements of the indentation modulus and hardness of copper. Pile-up (or sink-in) leads to contact areas that are greater than (or less than) the cross-sectional area of the indenter at a given depth.
K. W. McElhaney, J. J. Vlassak, W. D. Nix   +2 more
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Depth-sensing indentation of nanomaterials and nanostructures

Materials Characterization, 2013
Due to its capacity for applying ultralow loads and detecting nanometer-scale deflections, nanoindentation has been used to investigate the mechanical behavior of various material configurations at the micro- and nano-scales. The emphasis of the article is on the nanoscale deformation of nanoparticles, micro/nanopillars, microbeams, micro/nanofibers ...
Manuel L.B. Palacio, Bharat Bhushan
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Indentation Depth Dependent Hardness in Polydimethylsiloxane

Volume 1: Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters, 2011
Size dependent deformation in polymers has been observed in various experiments including microbeam bending, foams, composites and indentation. For indentation depths from 100 microns down to hundreds of nanometers strong increases in the hardness has been observed where the hardness has been determined with a Berkovich indenter tip on ...
Chung-Souk Han, Andrew J. Wrucke, Partha Majumdar   +2 more
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Depth-sensing indentation at macroscopic dimensions

Journal of Materials Research, 2002
A macroscopic-scale depth-sensing indentation apparatus with the ability to be mounted on an inverted microscope for in situ observation of contact events was calibrated using the Oliver and Pharr [J. Mater. Res. 7, 1564 (1992)] procedure with a two-parameter area function.
Jeremy Thurn, Dylan J. Morris, Robert F. Cook   +2 more
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The Indentation Load-depth Curve of Ceramics

Journal of Materials Research, 1999
The pyramidal indentation-induced surface deformation of brittle ceramics is examined on the basis of extensive test results for indentation load (P)-depth (h) curves during loading/unloading cycle. A mechanically stiff test system is essential for obtaining P-h curves acceptable and reliable for subsequent analyses.
M. Sakai, S. Shimizu, T. Ishikawa
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Simplified Area Function for Sharp Indenter Tips in Depth-sensing Indentation

Journal of Materials Research, 2002
A two-parameter “area function” characterizing the depth-dependent projected area of an indenter was introduced and applied to a Berkovich tip. The two parameters have physical meaning, corresponding to the effective tip radius and effective cone angle. The indenter tip was calibrated on a commercial load-controlled Nano Indentert® XP (MTS Systems Corp.
Jeremy Thurn, Robert F. Cook
openaire   +1 more source