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P will be close to the indentation hardness, H, of the asperity.
The traditional methods are based on well-defined physical indentation hardness tests.
The Indentation hardness, is defined slightly different.
When testing metals, indentation hardness correlates linearly with tensile strength.
Of these, indentation hardness itself leads to many operational definitions, the most important of which are:
Indentation hardness correlates linearly with tensile strength for most steels.
Nanoindentation is a variety of indentation hardness tests applied to small volumes.
Indentation hardness tests are used to determine the hardness of a material to deformation.
The Rockwell scale is a hardness scale based on indentation hardness of a material.
This response produces the observed properties of scratch and indentation hardness, as described and measured in materials science.
The first meaning is also applied in hardness measurement as in indentation hardness.
A nanoindenter is the main component for indentation hardness tests used in nanoindentation.
Common indentation hardness scales are Rockwell, Vickers, Shore, and Brinell.
A Berkovich tip is a type of nanoindenter tip used for testing the indentation hardness of a material.
The Brinell scale characterizes the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test-piece.
ASTM D2240 durometers allows for a measurement of the initial hardness, or the indentation hardness after a given period of time.
Indentation hardness tests compose the majority of processes used to determine material hardness, and can be divided into two classes: microindentation and macroindentation tests.
Mechanical properties include elasticity and plasticity, tensile strength, compressive strength, shear strength, fracture toughness, ductility (low in brittle materials), and indentation hardness.
Indentation hardness measures the resistance of a sample to material deformation due to a constant compression load from a sharp object; they are primarily used in engineering and metallurgy fields.
Contact mechanics is foundational to the field of mechanical engineering; it provides necessary information for the safe and energy efficient design of technical systems and for the study of tribology and indentation hardness.
Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: scratch hardness, indentation hardness, and rebound hardness.
Using linear elastic indentation hardness, a relation between the ASTM D2240 hardness and the Young's modulus for elastomers has been derived by Gentand by Mix and Giacomin.
They can be extremely hard (around 3 on Mohs, or an indentation hardness of about 30 kg/mm); thus, many termites and beetles have no physical difficulty in boring through foils made from such common metals as copper, lead, tin, and zinc.
For the situation where the asperities on the two surfaces have a Gaussian height distribution and the peaks can be assumed to be spherical, the average contact pressure is sufficient to cause yield when where is the uniaxial yield stress and is the indentation hardness.
