منابع مشابه
Brinell and Vickers Hardness Measurement Using Image Processing and Analysis Techniques
Mechanical hardness testing is fundamental in the evaluation of the mechanical properties of metallic materials due to the fact that the hardness values allow one to determine the wear resistance of the material involved, as well as the approximate values of its ductility, flow tension, among a number of other key characteristics. As a result, the main objective of the present work has been the...
متن کاملTesting of Macroscopic Hardness by Acoustic Response
ČERNÝ MICHAL, ŠUSTR MICHAL, DOSTÁL PETR. 2016. Testing of Macroscopic Hardness by Acoustic Response. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 64(3): 751–758. Static measurement of macroscopic hardness (hereina er macrohardness) of metal materials by using indentation testing is accompanied by deformation in the vicinity of the indenter. Its indenting in a material...
متن کاملLow-Load Vickers Microindentation Hardness Testing
ADVANCED MATERIALS & PROCESSES • APRIL 2012 I n 1925 in the UK, Smith and Sandland developed an indentation test that used a squarebased pyramidal-shaped indenter made of diamond[1]. The test was developed because the Brinell test (introduced in 1900), which (until recently) used a round hardened steel ball indenter, could not test steels harder than ~450 HB (~48 HRC). They chose this shape wit...
متن کاملTesting a new voting machine question methodology
A new question methodology has been developed and used with voting machines in large physics lecture classrooms. The methodology was tested by comparing student performance in voting machine and non-voting machine lecture sections during three consecutive electricity and magnetism quarters of introductory calculus-based physics. Data from The Conceptual Survey of Electricity and Magnetism and c...
متن کاملA scalarization-based method for multiple part-type scheduling of two-machine robotic systems with non-destructive testing technologies
This paper analyzes the performance of a robotic system with two machines in which machines are configured in a circular layout and produce non-identical parts repetitively. The non-destructive testing (NDT) is performed by a stationary robotic arm located in the center of the circle, or a cluster tool. The robotic arm integrates multiple tasks, mainly the NDT of the part and its transition bet...
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ژورنال
عنوان ژورنال: Nature
سال: 1921
ISSN: 0028-0836,1476-4687
DOI: 10.1038/107762a0