The measurement of abrasion resistance, usually by the weighing of a material sample before and after subjecting it to a known abrasive stress throughout a known time period, or by reflectance or surface finish comparisons, or by dimensional comparisons.



Related Terms

ABRASION

A general wearing away of a surface by constant scratching, usually due to the presence of foreign matter such as dirt, grit, or metallic particles in the lubricant. It may also cause a break down of the material (such as the tooth surfaces of gears). Lack of proper lubrication may result in abrasion.

SPALLING

The breaking off of the surface refractory material as a result of internal stresses.

CREEP LIMIT

The maximum stress a given material can withstand in a given time without exceeding a specified quantity of creep.

AXIAL MODULUS

The ratio of a simple tension stress applied to a material to the resulting strain parallel to the tension when the sides of the sample are restricted so that there is no lateral deformation. Also known as modulus of simple longitudinal extension.

SASTRUGI

Sharp, irregular ridges formed on a snow surface by wind erosion and deposition. On mobile floating ice, the ridges are parallel to the direction of the prevailing wind at the time they were formed.

ACCEPTANCE SAMPLING

Taking a sample from a batch of material to inspect for determining whether the entire lot will be accepted or rejected.

BIERBAUM SCRATCH HARDNESS TEST

A test for the hardness of a solid sample by microscopic measurement of the width of scratch made by a diamond point under preset pressure.

DIELECTRIC STRENGTH

A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)

FATIGUE LIFE

The number of applied repeated stress cycles a material can endure before failure.

BASELINE DELAY

The time interval needed for the signal from a master station of a hyperbolic radionavigation system to travel the length of the baseline, introduced as a delay between transmission of the master and slave (or secondary) signals to make it possible to distinguish between the signals and to permit measurement of time differences.

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