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Glossary
M10-94400-1
Stress-Strain Ratio.
Stress divided by strain at any load or deflection. Below
the elastic limit of a material, it is equal to tangent modu-
lus of elasticity. An alternate term is the secant modulus
of elasticity.
Stripping Strength.
Alternate term for peel strength.
Tangent Modulus of Elasticity.
The instantaneous rate of change of stress as a function
of strain. It is the slope at any point on a stress-strain dia-
gram.
Tear Length.
Measure of the drawability of sheet metal. Two small
parallel slots are cut in the edge of the sheet to form a
tab which is gripped and torn from the sheet. The vari-
ation in length of tabs torn in different directions is an in-
dication of crystal orientation in the sheet (tabs torn in
the direction of orientation are longer). The degree of
orientation is an indication of difficulty to be expected in
drawing the sheet to uniform shapes.
Tear Resistance.
Measure of the ability of sheet or film materials to resist
tearing. For paper, it is the force required to tear a single
ply of paper after the tear has been started.
Three standard methods are available for determining
tear resistance of plastic films: ASTM D-1004 details a
method for determining tear resistance at low rates of
loading; a test in ASTM D-1922 measures the force re-
B-32
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