The second part of the experiment was to determine the energy component for each material by running load-deflection curves using the sphere shaped indentor
at 10 N/sec.
Thinner samples may be used, although the support table starts to affect the value as thickness falls as the indentor
penetrates the sample.
Ltd; Japan) and a linear motor guide to transfer the motor rotation to the linear movement of the indentor
He grasps the indentor
across the palm of his other hand, with the tip emerging below the little finger.
The Rockwell test can be performed with various indentor
sizes and loads.
This method is based on the penetration of a specific type of indentor
pushed into the specimen by a specific dead weight; the test instrument is called a durometer (figure 2), hence the term durometer hardness.
5 mm/min using a spherical steel indentor
of diameter 5 mm driven by an Instron 1185 mechanical testing machine.
Microhardness by Vickers method was determined on transverse sections using an optic microscope Polyvar Met, equipped with an attachment for measurement of hardness at 5 g load to indentor
and 10 s loading duration.
Conventional test methods utilized to quantify the scratch resistance were measurements such as: reduction in gloss of a coating after being subjected to a traversing tangential load of known particle size abrasive (crockmeter test); measurement of damage depth and recovery of damage depth of a coating after exposure to a single point indentor
(nanoindentor (4,5)); or quantitative measurement of the fraction of elastic, viscoelastic creep, and fracture response of a coating after exposure to a single point indentor
(scanning probe microscope (6)).
The recognized tests for hardness of materials, Brinell, Rockwell, Vickers, etc, consist of applying known weights and specific indentor
shapes to the surface of material samples and measuring the resulting permanent indentations.
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Durometers are used to measure the hardness of non-metallic materials, such as rubber, and work by measuring the penetration of the gauge's indentor
under the specific conditions of a given durometer standard.