9762 papers found
The Rockwell hardness testing scale R can be test plastic. But dead weights and load cell type of hardness tester give different results. This research focused on study of the machine operation behavior. The experiment results showed that testing cycle of load cell type hardness testing machine cannot performed according to testing condition. It causes hardness value are softer than using dead weight type.
The present work discusses the measurement of material properties, i.e. hardness and modulus of elasticity obtained in a single express test based on the Automated Ball Indentation (ABI) using equipment and method developed by the authors. The ABI results will be subsequently used as an input data for the Finite Element Analysis (FEA) and compared to other methods.
A dead weight type Brinell-Vickers hardness standard machine was designed for TSE (Turkish Standards Institution) in the scope of TÜBITAK (The Scientific and Technological Research Council of Turkey) Project with project number 111G068. The scope of this project is mainly based on covering the requirements of a government agency by making R&D in the related field and it is funded by the TÜBITAK. A Brinell-Vickers hardness standard machine had been previously designed and established at UME (National Metrology Institute of Turkey) Hardness Laboratory as a National Standard to provide...
A new dead weight type Rockwell hardness standard machine with a laser interferometer optic system was designed for TSE (Turkish Standards Institution) in the scope of TÜBITAK (The Scientific and Technological Research Council of Turkey) Project with project number 111G068. The scope of this project is mainly based on covering the requirements of a government agency by making R&D in the related field and it is funded by the TÜBITAK. A Rockwell hardness standard machine had been previously designed and established at UME (National Metrology Institute of Turkey) Hardness Laboratory as a...
Many accredited calibration laboratories in Turkey have extended their calibration scopes and begun to serve calibration of durometers as a result of clients’ demand. Interlaboratory comparison is one of the best ways for assuring the quality of the calibration results and a proof of the dissemination of the SI units to industry for accredited calibration laboratories. For this reason TURKAK (Turkish Accreditation Agency) and TÜBITAK UME (National Metrology Institute of Turkey) for first time had decided to organize an interlaboratory comparison which was piloted by UME Hardness Laboratory...
The paper deals with the hardness measurement by mobile UCI hardness testers as a mean of determining the residual operation life of the power unit components. It aims to answer questions regarding the level of dependence of UCI hardness on Young´s modulus of creep-resistant steels and determining the conditions of UCI hardness tester calibration. The experimental part describes comparative measurements of hardness values obtained using stationary hardness tester and UCI hardness tester.
The present article contains the results of bilateral comparisons in the field of nanoindentation conducted in 2014 in the framework of cooperation between PTB and metrological institutes of Russia. The comparisons were held using primary standard machines applied in PTB and VNIIFTRI. Hardness numbers of Martens and indentation hardness scales obtained by the two laboratories were compared with due consideration of expanded uncertainties of measurements.
The paper describes comparison of Vickers hardness measurement in the high hardness range. The measurements were performed on the block made of WC-Co hardmetal on the reference Vickers hardness machine. The software package for the indentation analysis was developed. In order to confirm reliability of the results the hardness measurements were performed on the primary Vickers microhardness machine. On the basis of comparison was concluded that measured Vickers hardness fit well.
The novelty of this work is the analysis of accuracy measures and its visualization especially for two parameter measurements. The parameters of the resistance-to-voltage converters, i.e. different types of DC bridge-circuits with arbitrary variable resistive sensors (of relative resistance increments) and their accuracy measures are presented. Transfer coefficients, limited error and also standard uncertainty as the functions of relative increments of resistances are considered in a broad range for different types of supply and for different configurations of sensors.
Search coils are widely used for measuring AC magnetic fields, and in special cases for measuring DC magnetic fields with the webermeter and for comparing magnetic flux density standards and magnetic flux standards. This paper compares the measuring equipment that is used and the accuracy that can be achieved by known DC and AC methods for calibrating search coils with a high area turns value.