Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Micro-balloons: Microscopic bubbles of glass, ceramic or Phenolic, used as a filler or to create<br />
syntactic foam or putty mixtures.<br />
Microcracking: Microscopic cracks formed in composites when thermal stresses locally exceed<br />
the strength of the matrix.<br />
Micro-mechanics: Analysis of the structural behaviour of composites on a constituent (matrix,<br />
reinforcement, interface) level.<br />
Micron: One micron = .001 millimeter = .00003937 inch.<br />
Microspheres: Microscopic bubbles of glass, ceramic or phenolic, used as a filler or to create<br />
syntactic foam or putty mixtures.<br />
Micro-strain: The strain over a gage length comparable to the material's inter-atomic distance.<br />
Microstructure: A structure with heterogeneities that can be seen through a microscope.<br />
Mil: The unit used in measuring film thickness and the diameter of glass fiber strands, wire, etc.<br />
(one mil = .001")<br />
Mil Thickness: Mils - The unit used in measuring film thickness. One mil equals one<br />
thousandth of an inch. (1mil = .001).<br />
Milled Fibers: Crushed glass used generally for making glass filled putty.<br />
Modulus: A number which expresses a measure of some property of a material: modulus of<br />
elasticity, shear modulus, etc.; a coefficient of numerical measurement of a property. (Note: The<br />
use of the word without modifying terms may be confusing; and such use should not be<br />
encouraged.)<br />
Modulus, Chord: The slope of the chord drawn between any two specified points on the stressstrain<br />
curve.<br />
Modulus, initial: The slope of the initial straight portion of a stress-strain curve.<br />
Modulus of Elasticity: The ratio of the stress or load applied to the strain or deformation<br />
produced in a material that is elastically deformed. If a tensile strength of 2000 pounds per<br />
square inch results in an elongation of one percent, the modulus of elasticity is 2000 divided by<br />
0.01, or 200,000 pounds per square inch (Young's Modulus).<br />
Modulus, Secant: The slope of the secant drawn from the origin to any specified point on the<br />
stress-strain curve.