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Displaying 26 - 49 of 49

Tolerancing Form Deviations for Rockwell Diamond Indenters

September 1, 2002
Author(s)
Jun-Feng Song, Samuel R. Low III, Li Ma
The spherical tip of Rockwell diamond indenters tends to be manufactured either a flat- or sharp-shaped surface because of the anisotropy property of the diamond. This can cause significant differences in the hardness readings. In order to control that

An Empirical Approach to Determining Rockwell Hardness Measurement Uncertainty

July 1, 2002
Author(s)
Samuel R. Low III, Walter S. Liggett Jr
Characteristics of the empirically developed Rockwell hardness test make it difficult to determine measurement uncertainty using methods traditionally applied to other metrological measurements. An empirical approach to determining Rockwell hardness

Worldwide Comparisons of Rockwell Hardness Scales that Use a Diamond Indenter

July 1, 2002
Author(s)
Samuel R. Low III, Jun-Feng Song
The United States has participated in two major worldwide comparisons of Rockwell hardness scales over the past twenty years. In 1983, fourteen countries participated in a comparison of the Rockwell C scale. The latest worldwide comparison was completed in

FEA Modeling and Hardness Performance Prediction of Rockwell Diamond Indenters

July 1, 2001
Author(s)
Li Ma, J Zhou, Samuel R. Low III, Jun-Feng Song
The difficulty in manufacturing Rockwell diamond indenters to the required geometric specifications has resulted in most commercially manufactured indenters to vary in shape from one indenter to another. This difference in shape is thought to be a major

FEA Modeling and Hardness Performance Prediction of Rockwell Diamond Indenters

July 1, 2001
Author(s)
Hui Zhou, Jun-Feng Song, Samuel Low, Li Ma
The difficulty in manufacturing Rockwell diamond indenters to the required geometric specifications has resulted in most commercially manufactured indenters to vary in shape from one indenter to another. This difference in shape is thought to be a major

Modeling, Simulation and Prediction of Rockwell Hardness Indentation

January 1, 2001
Author(s)
Li Ma, J Zhou, Theodore V. Vorburger, R Dewit, Richard J. Fields, Samuel Low, Jun-Feng Song
Rockwell hardness test, as a measure of the resistance of a material to localized plastic deformation, is a valuable and widely used mechanical test. However, the accuracy of Rockwell hardness measurement is still in question. The indenter, including both

Form Error and Hardness Performance of Rockwell Diamond Indenters

September 1, 2000
Author(s)
Jun-Feng Song, Samuel R. Low III, Li Ma
The influences of form errors on hardness performance of Rockwell diamond indenter are discussed. Experimental results are introduced. The Finite Element Analysis (FEA) method is used to simulate the hardness measurement process. The effect of tip radii

The Effect of Suggested Changes to the Rockwell Hardness Test Method

September 1, 2000
Author(s)
Samuel R. Low III, David J. Pitchure, C D. Flanigan
In the latest revision of the ISO Rockwell hardness test standard (ISO/FDIS 6508(E), 1999), the introductory paragraphs introduce changes to the test practice; one new to this revision, and one suggested as a possibility for the next revision. The change

Capability in Rockwell C Scale Hardness

July 1, 2000
Author(s)
Walter S. Liggett Jr, Samuel R. Low III, David J. Pitchure, Jun-Feng Song
To determine the capability of a system for Rockwell C scale hardness, one must make test measurements, which can be planned and interpreted as explained in this paper. Uncertainty, which is one part of capability, is treated specifically, and product

Capability in Rockwell C Scale Hardness

July 1, 2000
Author(s)
Walter S. Liggett Jr, Samuel Low, David J. Pitchure, Jun-Feng Song
A measurement system is capable if it produces measurements with uncertainties small enough for demonstration of compliance with product specifications. To establish the capability of a system for Rockwell C scale hardness, one must assess measurement

Rockwell Hardness - A Method-Dependent Standard Reference Material

July 1, 1999
Author(s)
Samuel R. Low III, R J. Gettings, Walter S. Liggett Jr, Jun-Feng Song
Rockwell hardness is not a fundamental physical property of a material. It is a method-dependent measurement of the deformation of the material to an applied force. There are no alternative measurement systems to directly or independently measure Rockwell

Rockwell Hardness - A Method-Dependent Standards Reference Material

July 1, 1999
Author(s)
Samuel Low, R Gettings, Walter S. Liggett Jr, Jun-Feng Song
Rockwell hardness is a method-dependent measurement of the deformation of a material in response to an applied force. It is not a fundamental physical property of a material. There are no alternative measurement systems to directly or independently measure

Assessment Error Sources in Rockwell Hardness Measurements

June 1, 1999
Author(s)
Walter S. Liggett Jr, Samuel Low, David J. Pitchure, Jun-Feng Song
In the use of hardness test blocks, the uncertainty due to block non-uniformity can be reduced if one is willing to make measurements at specified locations on the blocks. Statistical methods for achieving this reduction are explained in this paper. The

A New Method of Certifying Standardized Rockwell Hardness Test Blocks

September 1, 1998
Author(s)
Samuel R. Low III, Walter S. Liggett Jr, David J. Pitchure
Rockwell hardness test blocks, whether standardized at the primary national laboratory level or by secondary commercial laboratories, have been certified historically by determining an average hardness value for the test surface of the block. However

Advances in NIST Standard Rockwell Diamond Indenters

January 1, 1998
Author(s)
Jun-Feng Song, Samuel R. Low III, David J. Pitchure, Theodore V. Vorburger
Recent developments in standard hardness machines and microform calibration techniques have made it possible to establish a worldwide unified Rockwell hardness scale with metrological traceability. This includes the establishments of the reference

Measurement Traceability of NIST Standard Rockwell Diamond Indenters

January 1, 1998
Author(s)
Jun-Feng Song, Samuel R. Low III, Walter S. Liggett Jr, David J. Pitchure, Theodore V. Vorburger
A metrology-based Rockwell hardness scale is established by a standard machine and a standard diamond indenter. Both must be established through force and dimensional metrology with acceptably small measurement uncertainties. In 1994, NIST developed a

Establishing a Worldwide Unified Rockwell Hardness Scale With Metrology Traceability

January 1, 1997
Author(s)
Jun-Feng Song, Samuel Low, David J. Pitchure, A Germak, S Desogus, T Polzin, H Yang, H Ishida, G Barbato
Recently developed microform measurement techniques have reduced the measurement uncertainties in the geometry of Rockwell diamond indenters. It is now possible to establish standard grade Rockwell diamond indenters characterized by high geometry