Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Tolerance Limit: A lower (upper) confidence limit on a specified percentile of a distribution.<br />
For example, the B-basis value is a 95% lower confidence limit on the tenth percentile of a<br />
distribution.<br />
Tolerance Limit Factor: The factor which is multiplied by the estimate of variability in<br />
computing the tolerance limit.<br />
Tool: The mold, either one- or two-sided or either open or closed, in or upon which composite<br />
material is placed in order to make a part.<br />
Tooling Gel Coat/Laminating Resin: It is special polyesters designed to give ultimate strengths<br />
and cure values for moldmaking.<br />
Tooling Resins: Plastic resins, chiefly epoxy and silicon that are used as tooling aids.<br />
Toughness: A measure of a material's ability to absorb work, or the actual work per unit volume<br />
or unit mass of material that is required to rupture it. Toughness is proportional to the area under<br />
the load-elongation curve from the origin to the breaking point.<br />
Tow: An untwisted bundle of continuous filaments. It is commonly used in referring to manmade<br />
fibers, particularly carbon and graphite fibers, in the composites industry.<br />
Transformation: A transformation of data values is a change in the units of measurement<br />
accomplished by applying a mathematical function to all data values. For example, if the data is<br />
given by x, then y = x + 1, x, 1/x, log x, and cos(x) are transformations.<br />
Transition, First Order: A change of state associated with crystallization or melting in a<br />
polymer.<br />
Translucent: Permits a percentage of light to pass but not optically clear like window glass.<br />
Transversely Isotropic: Descriptive term for a material exhibiting a special case of orthotropy<br />
in which properties are identical in two orthotropic dimensions, but not the third; having<br />
identical properties in both transverse directions but not the longitudinal direction.<br />
Traveller: A small piece of the same product (panel, tube, etc.) as the test specimen, used for<br />
example to measure moisture content as a result of conditioning.<br />
Twist: The number of turns about its axis per unit of length in a yarn or other textile strand. It<br />
may be expressed as turns per inch (tpi) or turns per centimeter (tpcm).<br />
Twist, Direction of: The direction of twist in yarns and other textile strands is indicated by the<br />
capital letters S and Z. Yarn has S twist if, when held in a vertical position, the visible spirals or<br />
helices around its central axis are in the direction of slope of the central portion of the letter S,<br />
and Z twist is in the other direction.