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Yerzley mechanical oscillograph test. Method for determining the dynamic mechanical properties of rubber. (ASTM D-945). Results of test are reported as deformation energy, effective dynamic modulus and Yerzley resilience.

Yerzley resilience. Measure of resilience of rubber subjected to dynamic loading.

Yield point. Stress at which strain increases without accompanying increase in stress. Only a few materials (notably steel) have a yield point and generally only under tension loading.

Yield point elongation. Strain at yield point of a material. It is an indication

of ductility.

Yield strength. Indication of maximum stress that can be developed in a material without causing plastic deformation. It is the stress at which a material exhibits a specified permanent deformation and is a practical approximation of elastic limit.

Offset yield strength is determined from a stress-strain diagram. It is the stress corresponding to the intersection of the stress-strain curve and a line parallel to its straight line portion offset by a specified strain. Offset is usually specified as 0.2 %, i.e., the intersection of the offset line and the 0-stress axis is at 0.2 % strain.

Yield strength elongation. Strain corresponding to yield strength of material. It is an indication of ductility.

Yield value. Stress in an adhesive joint at which a marked increase in deformation occurs without an increase in load.

Young’s modulus. Alternate term for modulus of elasticity in tension or compression. Reprinted from MATERIALS ENGINEERING, June 1967 issue, Reinhold Publishing Corporation, 430 Park Avenue, New York, N. Y. 10022

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