Definitions /Dictionary/Glossary - nptel

Tensile Elongation: An engineering term referring to the amount of stretch a sample
experiences during tensile strain. ASTM D-638.
Tensile Load: A dulling load applied to opposite ends of a given sample.
Tensile Modulus: When a bar is pulled in tension, it has to get longer. The tensile modulus is
used to calculate how much longer it will get when a certain load is applied to it. Units are
normally millions of pounds per square inch. (10 6 psi) - Giga Pascals (gPa). Higher numbers
indicate materials, which will not elongate as much as others when they are being compared
under equal tensile loading conditions.
Tensile Strength or Stress: The maximum tensile load per unit area of original cross section,
within the gage boundaries, sustained by the specimen during a tension test. It is expressed as
psi. Tensile load is interpreted to mean the maximum tensile load sustained by the specimen
during the test, whether or not this coincides with the tensile load at the moment of rupture.
Tex: A unit for expressing linear density equal to the mass or weight in grams of 1000 meters of
filament, fiber, yarn or other textile strand.
Thermal Coefficient of Expansion: Measures dimensional change of a material when heated or
cooled. It is measured in inches per inch per degree.
Thermal Conductivity: Ability of a material to conduct heat. It is the physical constant for
quantity of heat that passes through unit cube of a substance in unit time when the difference in
temperature of two faces is one degree.
Thermoplastic: A plastic that repeatedly can be softened by heating and hardened by cooling
through a temperature range characteristic of the plastic, and when in the softened stage, can be
shaped by flow into articles by molding or extrusion.
Thermal Stress Cracking: Crazing and cracking of some thermoplastic resins from
overexposure to elevated temperatures.
Thermocouple: Wire assembly used with a control device to sense temperature readings.
Thermoset: A class of polymers that, when cured using heat, chemical, or other means, changes
into a substantially infusible and insoluble material.
Thixotropic, Thixotropy: Concerning materials that are gel-like at rest but fluid when agitated;
having high static shear strength and low dynamic shear strength, at the same time.
Thixotropic Index (T.I.): A measurement of thixotropy nature determination, using a
Brookfield viscometer, as the low speed viscosity divided by the high-speed viscosity.
Tolerance: The total amount by which a quantity is allowed to vary.