Yarn: twisted strands of roving, used to weave textile reinforcements.
Yield Point: first stress in a material, less than the maximum attainable stress, at which the strain increases at a higher rate than the stress. The point at which permanent deformation of a stressed specimen begins to take place. Only materials that exhibit yielding have a yield point.
Yield Strength: stress at the yield point. The stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain. The lowest stress at which a material undergoes plastic deformation. Below this stress, the material is elastic; above it, the material is viscous. Often defined as the stress needed to produce a specified amount of plastic deformation (usually a 0.2% change in length).
Young's modulus: ratio of normal stress to corresponding strain for tensile or compressive stresses less than the proportional limit of the material.
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GLOSSARY OF TERMS
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