Portable Hardness Testing

Portable Hardness is a material’s resistance to penetration. In general, an indenter is pressed into the surface of the material to be tested under a specific load for a definite time interval, and a measurement is made of the size or depth of the indentation.

Hardness properties include such varied attributes as resistance to abrasives, resistance to plastic deformation, high modulus of elasticity, high yield point, high strength, absence of elastic damping, brittleness or lack of ductility.

Hardness is not a fundamental property of a material, but a response to a particular test method. Basically hardness values are arbitrary, and there are no absolute standards for hardness. Hardness has no quantitative value, except in terms of a given load applied in a specific, reproducible manner and with a specified indenter shape.

Some Hardness Testing Methods are

• Rockwell Hardness Test
• Rockwell Superficial Hardness Test
• Brinell Hardness Test
• Vickers Hardness Test
• Mohs Hardness Test

Hardness of materials has probably long been assessed by resistance to scratching or cutting. Relative hardness of minerals can be assessed by reference to the Mohs scale that ranks the ability of materials to resist scratching by another material.

Portable Hardness

Portable Hardness

Hardness of materials has probably long been assessed by resistance to scratching or cutting. Relative hardness of minerals can be assessed by reference to the Mohs scale that ranks the ability of materials to resist scratching by another material. 

The different methods and differently shaped indenters used by, for example, Brinell and Rockwell produce dissimilar responses of the material under test. To compare the hardness of two different samples, both must be measured using the same hardness scale, or a scale must be developed to convert from one measurement to the other.

The relationship of load to the area or depth of indentation is a measure of hardness, such we could found in Brinell, Rockwell, Vickers hardness testing. For practical and calibration reasons, each of these methods is divided into a range of scales, defined by a combination of applied load and indenter geometry.

originally found here:- http://www.ndtindia.org/portable-hardness.html

Portable Hardness

Hardness is a material's resistance to penetration. In general, an indenter is pressed into the surface of the material to be tested under a specific load for a definite time interval, and a measurement is made of the size or depth of the indentation.
Hardness properties include such varied attributes as resistance to abrasives, resistance to plastic deformation, high modulus of elasticity, high yield point, high strength, absence of elastic damping, brittleness or lack of ductility.

originally found here:- http://www.ndtindia.org/portable-hardness.html