The Influence of the Load on the Hardness

Open access

The Influence of the Load on the Hardness

The objective of the submitted paper is to analyze the influence of the load on the calibration of micro-hardness and hardness testers. The results were validated by Measurement Systems Analysis (MSA), Analysis of Variance (ANOVA) and Z-score. The relationship between the load and micro-hardness in calibration of micro-hardness testers cannot be explained by Kick's Law (Meyer's index "n" is different from 2). The conditions of Kick's Law are satisfied at macro-hardness calibration, the values of "n" are close to 2, regardless of the applied load. The apparent micro-hardness increases with the increase of the load up to 30 g; the reverse indentation size effect (ISE) behavior is typical for this interval of the loads. The influence of the load on the measured micro-hardness is statistically significant for majority of calibrations.

Swornowski, P. (2006). The influence of inaccuracy of calculating algorithms used in the CMMs on measurement results - final report. Metrology and Measurement Systems, 13(4), 433-446.

Veles, P. (1985). Mechanical properties and testing of metals. Alfa/SNTL, 307-320. (in Slovak)

Sangwal, K., Surowska, B., Błaziak, P. (2002). Analysis of the indentation size in the microhardness measurement of some cobalt-based alloys. Materials Chemistry and Physics, 77(2), 511-520.

ISO 10 012:2003 Measurement management systems - Requirements for measurement processes and measuring equipment.

STN EN ISO 6507-2:2005 Metallic materials. Vickers hardness test. Part 2: Verification and calibration of testing machines.

STN EN ISO 6507-1:2005 Metallic materials. Vickers hardness test. Part 1: Test method.

Adamczak, S. et al. (2011). Statistical validation of the method for measuring radius variations on the machine tool. Metrology and Measurement Systems, 18(1), 35-46.

Measurement system s analysis (MSA). (2003). Reference manual. Third edition, 102-120.

Methodical guidelines for accreditation. (1998). Proficiency testing schemes. MSA 0113-98, 32-34. (in Slovak).

Tobolski, E. (2003). Uncertainty in Hardness testing. Advanced materials & processes, 161(5), 25-26.

EA-10/16 EA Guidelines on the Estimation of Uncertainty in Hardness Measurements. (2004). Annex Guideline to the evaluation of the uncertainty of the Brinell and the Vickers measuring method.

Dietrich, E. (2001) Es geht auch einfach. Messunsicherheit in Analogie zur Prüfmittelfähigkeit bestimmen. QZ Magazine, 46 (3), 264 - 265. (in German).

Fotowicz, P. (2010). Systematic effect as a part of the coverage interval. Metrology and Measurement Systems, 17 (3), 439-446.

Petrík, J., Palfy, P. (2010). The quality of Vickers hardness tester calibration. Journal of Engineering. Annals Faculty of Engineering Hunedoara, 8 (1), 63-66.

Gong, J., Wu, J., Guan, Zh. (1999). Examination of the Indentation Size Effect in Low-load Vickers Hardness Testing of Ceramics. Journal of the European Ceramic Society, 19, 2625 - 2631.

Sangwal, K., Hordyjewicz, M., Surowska, B. (2002). Microindentation hardness of SrLaAlO4 and SrLaGaO4 single crystals. Journal of Optoelectronics and Advanced Materials, 4(4), 875-882.

Metrology and Measurement Systems

The Journal of Committee on Metrology and Scientific Instrumentation of Polish Academy of Sciences

Journal Information


IMPACT FACTOR 2016: 1.598

CiteScore 2016: 1.58

SCImago Journal Rank (SJR) 2016: 0.460
Source Normalized Impact per Paper (SNIP) 2016: 1.228

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 58 58 17
PDF Downloads 12 12 3