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Indentation Image Analysis for Vickers Hardness Testing
2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE), 2018The paper presents a novel algorithm for detection and measurement of indentations in Vickers hardness testing images, within a specific case of applied research on material quality evaluation based on image processing. The algorithm performs image segmentation by binarization, morphological filtering, and region growing, where the binarization ...
Petra Wiederhold +1 more
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Finite Element Method for Simulating the Vickers Hardness Test
Applied Mechanics and Materials, 2014The purpose of the present paper is to present a different approach to the finite element modeling of the Vickers hardness test measurement, and to establish a numerical correlation between the Young modulus of a material and its hardness. In order to realize this, calculations were based upon the tensions acquired as a result of the hollow caused in ...
Ionelia Voiculescu +5 more
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Microstructure and Vickers-hardness of 20CrMnTiH steel during hot compression testing [PDF]
Ironmaking & Steelmaking, 2017 The isothermal hot compression tests of 20CrMnTiH steel were carried out by using Gleeble-3500 thermo-simulation-machine at deformation temperatures ranging from 1123 to 1423 K and at strain rates ...
Fei Qin, Wei Feng, Shuting Wu
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Algorithms for microindentation measurement in automated Vickers hardness testing
SPIE Proceedings, 2011Current algorithms in automated indentation measurement in the context of Vickers microindentation hardness testing suffer from a lack of robustness with respect to entirely missed indentation corner points when applied to real world data sets. Four original algorithms are proposed, discussed and evaluated on a significant data set of indentation ...
Michael Gadermayr +2 more
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Comparison of Brinell and Vickers Hardness Tests on Dental Casting Gold Alloys
Journal of Dental Research, 1973The relationship between Vickers and Brinell hardness numbers of dental casting gold alloys was found to be linear; the addition of 19 to the Brinell number approximated the Vickers number fairly well. The coefficient of variation for the Brinell test was about 1 % less than that of the Vickers test. Effects of reading error, sample inhomogeneity, and
J.D. Eick, George Dickson, J.A. Barton
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Analysis of Indentation Size Effect of Vickers Hardness Tests of Steels
Advanced Materials Research, 2013In this work, the indentation size effect (ISE) in Vickers hardness tests of steel with selected heat treatments (annealed or tempered) has been investigated and analysed. Systematical hardness tests were performed within a commonly used micro-load range.
Xuejun Ren +4 more
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The evaluation of the structure and hardness of processed plastics by the Vickers microhardness test
Colloid and Polymer Science, 1977The Vickers microhardness test has been used as an additional tool for the determination of the microstructure of an injection moulded semicrystalline thermoplastic. The results show for the first time that there is a clear and well defined correlation between microhardness measurements and changes in preferred orientation through the thickness of the ...
M. Bevis, J. Bowman
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Robust algorithm for automated microindentation measurement in Vickers hardness testing
Journal of Electronic Imaging, 2012Current algorithms for automated processing of Vickers hardness testing images are unsuitable for a broad range of images that are taken in industrial environments because such images show great variations in the Vickers indentation as well as in the specimen surface.
Michael Gadermayr +2 more
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Journal of Testing and Evaluation, 1994
AbstractThe evaluation of the elastic-plastic properties of a material by using an ultra-low load hardness test requires a geometrical calibration that must take into account the imperfect form of the diamond indenter. In the present work, the Vickers indenter offset of the microindentation equipment was estimated using differently heat-treated steel ...
José Valdemar Fernandes +2 more
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AbstractThe evaluation of the elastic-plastic properties of a material by using an ultra-low load hardness test requires a geometrical calibration that must take into account the imperfect form of the diamond indenter. In the present work, the Vickers indenter offset of the microindentation equipment was estimated using differently heat-treated steel ...
José Valdemar Fernandes +2 more
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Examination of the indentation size effect in low-load vickers hardness testing of ceramics
Journal of the European Ceramic Society, 1999Abstract The indentation size effect (ISE) in Vickers hardness for several ceramic materials was observed in a relatively wider range of applied test load. It was shown that the proportional specimen resistance (PSR) model proposed by Li and Bradt is insufficient for describing the experimental data. By considering the effect of the machining-induced
Jianjun Wu, Jianghong Gong, Zhenduo Guan
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