Definitions /Dictionary/Glossary - nptel

Circumferential Winding: A type of filament winding in which the filaments are perpendicular
to the axis.
Clamping Pressure: In injection molding and transfer molding, the pressure that I is applied to
the mold to keep it closed in opposition to the fluid pressure of the compressed molding material.
Clean Core: This form of honeycomb core is clean and packed in such a way that it is ready for
bonding without vapour degreasing or cleaning.
Closure: It is the complete coverage of a mandrel with one layer (two plies) of fibre.
Cloth: A fine weaves of woven fiberglass.
Cobalt: Used as the accelerator for Methyl Ethyl Ketone Peroxide catalyzed polyesters.
Cocure: The process of curing a material and bonding it to another surface during the same cure
cycle.
Cocured: Cured and simultaneously bonded to another prepared surface.
Cocuring: The act of curing a composite laminate and simultaneously bonding it to some other
prepared surface during the same cure cycle (see Secondary Bonding).
Coefficient of Elasticity: The reciprocal of Young's modulus in a tension test.
Coefficient Of Expansion (COE): Measure of the change in length or volume of an object.
Coefficient of Linear Thermal Expansion: The change in length per unit length resulting from
a one-degree rise in temperature.
Coefficient of Thermal Expansion (CTE): A material's fractional change in length for a
given unit of change in temperature.
Coefficient of Variation: The ratio of the population (or sample) standard deviation to the
population (or sample) mean.
Cohesion: Tendency of a single substance to adhere to itself. It is also, the force holding a single
substance together.
Cohesive Failure: Failure of an adhesive joint occurring primarily in an adhesive layer.
Cohesive Strength: It is the intrinsic strength of an adhesive.
Coin Tap: Tapping a laminate with a coin in different spots to detect a change in sound,
indicating the presence of a defect that may require repair.