With the aim to achieve worldwide valid ISO Standards the International standards committee ISO/TC 164/SC 3 "Hardness testing of metallic materials" published in 1997-1999 the hardness testing standards for the Brinell, Vickers and Rockwell methods according to the parallel voting in CEN. This contribution contains the results of the first revision of these standards carried out in 2004/2005 and presents for the users the most important amendments.
XVIII IMEKO World Congress · TC5 · 2006 · Download
This report describes the work carried out to provide sensitivity coefficients for the Rockwell HRA and Superficial Rockwell HR15N and HR30N scales. Sensitivity coefficients were determined for the preliminary test force, total test force, force duration times, loading times, and loading rates. Work was carried out at both the National Physical Laboratory (NPL) in Teddington, UK and the National Institute of Standards and Technology (NIST) in Gaithersburg, USA.
XVIII IMEKO World Congress · TC5 · 2006 · Download
In this paper the approach and results for the estimation of uncertainty in measurements of rubber and plastics are presented. The developed uncertainty guidelines are based on "Guide to the Expression of Uncertainty in Measurement" (ISO GUM). As the most important and widely used hardness measuring methods for rubber and plastics the methods according to Durometer (A and D) and to the International Rubber Hardness Degree (IRHD), scales N, M and L are dealt with. Additionally a new hardness measuring method for soft silicones, called Hardness Very Low (HVL), which is still in the process of...
XVIII IMEKO World Congress · TC5 · 2006 · Download
Materials metrology is becoming an increasingly important international issue, with the worldwide efforts to realize a free trade agreement. The establishment of a traceability chain in materials metrology is, however, difficult because the measurement of materials properties is commonly procedure-dependent. This means that the establishment of a traceability chain in measurement of materials properties is not so straightforward as in physical measurement. In fact, three essential components, namely reference procedure, reference machine, and reference materials, are required to establish a...
XVIII IMEKO World Congress · TC5 · 2006 · Download
Previews studies on the effect of loading rate on the micro and nano indentation hardness showed that both of them affect hardness measurements. Such effect has been included in micro and nano hardness measurements. ISO/FDIS 14577-1 standard determine the loading rate of the indenter for micro hardness showed not exceed 2 µm/sec and for nano hardness should be less then 10 nm/sec. The present study is a trial to reveal the effect of both loading rate and duration time on the macro indentation hardness applied on standard hardness test blocks. A modern Zwick hardness tester that could vary...
XVIII IMEKO World Congress · TC5 · 2006 · Download
Recently image analysis systems have become available and are now used widely in industry. While there are great benefits in using this method to measure Brinell hardness indentations, a method to verify these systems is needed. Older methods using flat stage micrometers exclusively are not sufficient. Methods and guidelines for the use of these systems should be developed.
XVIII IMEKO World Congress · TC5 · 2006 · Download
Jiong-Shiun Hsu, Chi-Shen Chang, Yu-Yi Su, Jeah-Sheng Wu, Sheau-Shi Pan
In this paper, the uncertainty of nanoindentation system was evaluated. The laser interferometer and electronic balance were respectively adopted to calibrate the quantities of displacement and load of nanoindeantion system. The results reveal that the relative expanded uncertainty of indeantion hardness, U H , is 8.1%. The relative expanded uncertainity of reduced modulus, U Er , is 5.4%.
XVIII IMEKO World Congress · TC5 · 2006 · Download
Concerning the specimen heating table attached to an instrumented indentation testing machine, one of the hardness testing machines, for realizing the hardness test of heated specimen, thermal influences to the instrumented indentation testing machine by attaching the specimen heating table have been examined. Consequently, it has been clarified that test result errors are mainly induced by the fact that the thermal expansion by the increase in temperature of the indenter (the metal part fixing the diamond tip) is added to the measured indentation depth, so that the accurate indentation...
XVIII IMEKO World Congress · TC5 · 2006 · Download
The instrumented indentation test provides a versatile method to determine several materials parameter. In order to provide reference specimens, a calibration machine according to ISO 14577-3 is designed for the macro range. Using innovative technology, the new machine design may lead to a standard solution not only for calibration machines.
XVIII IMEKO World Congress · TC5 · 2006 · Download
The contribution concerns the dominant source of uncertainty in the upper macro range of the instrumented indentation test. The strong effect of the machine compliance is demonstrated (including for machines with a displacement measurement which is related to the surface of the specimen). Four methods are applied for analyzing the experimental results up to 2500 N. The results show that the uncertainty of the compliance should be limited in ISO 14577 part 3.
XVIII IMEKO World Congress · TC5 · 2006 · Download