scholarly journals Analysis of Depth-Sensing Indentation Tests with a Knoop Indenter

2001 ◽  
Author(s):  
L Riester
Keyword(s):  
Depth Sensing ◽  
Indentation Tests ◽  
Knoop Indenter

scholarly journals Analysis of depth-sensing indentation tests with a Knoop indenter

2001 ◽  
Vol 16 (6) ◽  
pp. 1660-1667 ◽  
Author(s):  
L. Riester ◽  
T. J. Bell ◽  
A. C. Fischer-Cripps
Keyword(s):  
Elastic Modulus ◽  
Elastic Recovery ◽  
Indentation Test ◽  
New Method ◽  
Short Axis ◽  
Depth Sensing ◽  
Specimen Material ◽  
Indentation Tests ◽  
Conventional Methods ◽  
Knoop Indenter

The present work shows how data obtained in a depth-sensing indentation test using a Knoop indenter may be analyzed to provide elastic modulus and hardness of the specimen material. The method takes into account the elastic recovery along the direction of the short axis of the residual impression as the indenter is removed. If elastic recovery is not accounted for, the elastic modulus and hardness are overestimated by an amount that depends on the ratio of E/H of the specimen material. The new method of analysis expresses the elastic recovery of the short diagonal of the residual impression into an equivalent face angle for one side of the Knoop indenter. Conventional methods of analysis using this corrected angle provide results for modulus and hardness that are consistent with those obtained with other types of indenters.

scholarly journals Influence of Vickers tip imperfection on depth sensing indentation tests

2007 ◽  
Vol 44 (9) ◽  
pp. 2732-2747 ◽  
Author(s):  
J.M. Antunes ◽  
L.F. Menezes ◽  
J.V. Fernandes
Keyword(s):  
Depth Sensing ◽  
Indentation Tests

Characterization of plastic instability steps occurring in depth-sensing indentation tests

2002 ◽  
Vol 324 (1-2) ◽  
pp. 219-224 ◽  
Author(s):  
N.Q Chinh ◽  
Gy Horváth ◽  
Zs Kovács ◽  
J Lendvai
Keyword(s):  
Plastic Instability ◽  
Depth Sensing ◽  
Indentation Tests

Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests

2018 ◽  
Vol 117 ◽  
pp. 96-104
Author(s):  
Toshiaki Masuda ◽  
Yasutomo Omori ◽  
Ryoko Sakurai ◽  
Tomoya Miyake ◽  
Mirai Yamanouchi ◽  
...  
Keyword(s):  
Depth Sensing ◽  
Indentation Tests

Simulation of sub-micron indentation tests with spherical and Berkovich indenters

2001 ◽  
Vol 16 (7) ◽  
pp. 2149-2157 ◽  
Author(s):  
A. C. Fischer-Cripps
Keyword(s):  
Experimental Data ◽  
Elastic Modulus ◽  
Material Properties ◽  
Indentation Testing ◽  
Depth Sensing ◽  
Displacement Response ◽  
Analysis Methods ◽  
Detailed Treatment ◽  
Indentation Tests ◽  
Load Displacement

The present work is concerned with the methods of simulation of data obtained from depth-sensing submicron indentation testing. Details of analysis methods for both spherical and Berkovich indenters using multiple or single unload points are presented followed by a detailed treatment of a method for simulating an experimental load–displacement response where the material properties such as elastic modulus and hardness are given as inputs. A comparison between simulated and experimental data is given.

Film Fracture Phenomena During Indentation

2000 ◽  
Vol 649 ◽  
Author(s):  
D.F. Bahr ◽  
M. Pang ◽  
D. Rodriguez-Marek
Keyword(s):  
Permanent Deformation ◽  
Dislocation Nucleation ◽  
Ex Situ ◽  
Depth Sensing ◽  
Indentation Tests ◽  
Probe Microscope ◽  
Rapid Generation ◽  
Engineering Alloys ◽  
Complementary Set ◽  
Passivating Films

ABSTRACTDiscontinuities during both load and depth controlled continuous indentation tests have been ascribed to dislocation nucleation or multiplication and film fracture. In materials which exhibit permanent deformation prior to a discontinuity in loading, it is more likely that the phenomena is indeed controlled by film fracture, and not the rapid generation of dislocations. The current study has been undertaken to examine the properties of passivating films on engineering alloys. An electrochemical cell coupled with a scanning probe microscope and nanoindentation system allows growth and mechanical testing of passive films on an austenitic stainless steel as well as a titanium alloy. A complementary set of ex situ experiments shows the presence of deformation prior to film fracture with both load – depth sensing techniques as well as imaging the surface topography. The occurrence of excursions is shown in these materials to be linked directly with film fracture, rather than dislocation multiplication.

Microstructure and Mechanical Behavior of Magnetron Sputtered Al-Cu Films

1991 ◽  
Vol 226 ◽  
Author(s):  
Tsann Lin ◽  
V. Raman
Keyword(s):  
Mechanical Behavior ◽  
Grain Morphology ◽  
Depth Sensing ◽  
Cu Films ◽  
Sputtered Films ◽  
Fine Grain ◽  
Platelet Morphology ◽  
Transmission Electron ◽  
Indentation Tests ◽  
Substrate Temperatures

AbstractWe have investigated the microstructure, electrical resistivity and mechanical behavior of DC magnetron sputtered A1-4wt%Cu films. The substrate temperatures were varied systematically from room temperature to 500 °C. Scanning and transmission electron microscopy of the sputtered films show that the top surface of the films sputtered at low temperatures (< 200 °C) exhibits a pure Al-like fine grain morphology. In contrast, sputter deposition at higher temperatures (> 300 °C) produces films that are characterized at the top surface by a distribution of θ’-A12Cu precipitates with a platelet morphology. The mechanical behavior of the sputtered films were investigated by performing indentation tests using a depth-sensing technique.

Effect of Loading Schemes on Depth-Sensing Indentation Tests

2004 ◽  
Vol 32 (6) ◽  
pp. 11967
Author(s):  
J-M Zhang ◽  
K-W Xu ◽  
J Lu ◽  
B Guelorget
Keyword(s):  
Depth Sensing ◽  
Indentation Tests

scholarly journals A new method for hardness determination from depth sensing indentation tests

1996 ◽  
Vol 11 (12) ◽  
pp. 2964-2967 ◽  
Author(s):  
J. Gubicza ◽  
A. Juhász ◽  
J. Lendvai
Keyword(s):  
Contact Pressure ◽  
Elastic Material ◽  
Depth Sensing ◽  
Hardness Number ◽  
Indentation Tests ◽  
Semiempirical Formula ◽  
Loading And Unloading ◽  
The Mean ◽  
Limiting Case

A new semiempirical formula is developed for the hardness determination of the materials from depth sensing indentation tests. The indentation works measured both during loading and unloading periods are used in the evaluation. The values of the Meyer hardness calculated in this way agree well with those obtained by conventional optical observation, where this latter is possible. While the new hardness formula characterizes well the behavior of the conventional hardness number even for the ideally elastic material, the mean contact pressure generally used in hardness determination differs significantly from the conventional hardness number when the ideally elastic limiting case is being approached.

Influence of the Microstructure on Macro/Micro versus Nanohardness of SiC Ceramics

2014 ◽  
Vol 606 ◽  
pp. 197-200 ◽  
Author(s):  
Alexandra Kovalčíková ◽  
Ján Dusza ◽  
Pavol Šajgalík
Keyword(s):  
Silicon Carbide ◽  
Elastic Modulus ◽  
Liquid Phase ◽  
Grain Growth ◽  
Depth Sensing ◽  
Sic Ceramics ◽  
Peak Loads ◽  
Heat Treated ◽  
Indentation Tests ◽  
Sintered Silicon

The influence of microstructural variations on the macro/microhardness, nanohardness and Young`s modulus of liquid phase sintered silicon carbide (LPS SiC) has been observed. In order to modify the microstructures some samples were further heat treated at 1850°C for 5 hours to promote grain growth. The depth-sensing indentation tests of SiC materials were performed at several peak loads in the range 10-400 mN. For a better assessment, the indentation values of hardness and Young`s modulus modulus of SiC matrix were also compared to the hardness and Elastic modulus of individual SiC grains. The comparison of macro/micro and nanohardness showed that nanohardness was significantly higher, generally by 6-7 GPa. The nanohardness of individual plate-like SiC grains was around 2 GPa higher than nanohardness of SiC matrix.

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