Hardness testing
Brinell · Rockwell · Vickers · Mohs · Shore
Choose a sample and a device, then prepare the assembly.
Position and traces
Click on a free point. Previous traces remain on the face.
Small prints are amplified to remain visible.
Reading and measuring
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Charge cycle and response
Simulated timeThe depth and the elastic return are schematized; Calculated fingerprints and readings use the units indicated.
Test notebook
| N° | Sample/grain | Conditions | Reading |
|---|
Operations log
Models, areas of application and references
This bench uses virtual test tubes. Metals, ceramics and polymers have assigned values for the exercise, specific to their condition and their method; they are not subject certificates. Mohs intervals and microhardnesses of minerals are accompanied by their source sheet. The catalog is a library of examples, which can be expanded.
Brinell: force in kgf, WC ball, measurement of two diameters; the model controls d/D between 0.24 and 0.60 and a thickness of at least eight times the depth. Vickers: force in kgf, diamond 136°, average of diagonals; minerals are limited to the charge of the reference. Rockwell: preload 10 kgf, total loads A 60 / B 100 / C 150 kgf, reading of e on return under preload; the pitch is 0.002 mm.
The positions are checked with conservative distances: Brinell six diameters between points and three at the edge; Vickers three diagonals between points and 2.5 at the edge; these rules do not reproduce all the variations of the standards. A test interrupted after contact leaves a trace. The springback of the diagrams is illustrative. Roughness, cracking, complete anisotropy, work hardening and real metrological calibration are not resolved.
Mohs: deposited powder is not a scratch. The comparison is ordinal; cross-tests monitor grain strength. The heterogeneous ore is not affected by an overall hardness. Shore A/D: reading under contact, maximum travel of 2.5 mm, minimum retained thickness of 6 mm and flat surface. The creep shown is indicative; scales A and D remain distinct.
Shore rebound: educational assembly distinct from A/D durometers. The drop is 250 mm; a block of the bench bouncing at 160 mm defines 100 HS units of the bench. The simulated height determines the restitution coefficient √(h/h₀). This montage does not purport to reproduce a specific HSc/HSd commercial model. Falling and bouncing are slowed down on screen. No universal conversion between the five families is calculated.
References: ZwickRoell · Brinell ; Struers · indentation and depth tests ; Instron · Rockwell ; Mineralogical Society of America · Mohs ; ZwickRoell · Shore ; ASTM · historical scleroscope ; Handbook of Mineralogy · mineral sheets.