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Glossary
Secant Modulus of Elasticity.
Ratio of stress to strain at any point on curve in a stress-
strain diagram. It is the slope of a line from the origin to
any point on a stress-strain curve.
Shear Modulus of Elasticity.
Tangent or secant modulus of elasticity of a material sub-
jected to shear loading. Alternate terms are modulus of
rigidity and modulus of elasticity in shear. Also, shear
modulus of elasticity usually is equal to torsional modu-
lus of elasticity. A method for determining shear modu-
lus of elasticity of structural materials by means of a
twisting test is given in ASTM E-143. A method for de-
termining shear modulus of structural adhesives is given
in ASTM E-229.
Shear Strength.
Maximum shear stress that can be sustained by a mate-
rial before rupture. It is the ultimate strength of a mate-
rial subjected to shear loading. It can be determined in a
torsion test where it is equal to torsional strength. The
shear strength of a plastic is the maximum load required
to shear a specimen in such a manner that the resulting
pieces are completely clear of each other. It is reported
in psi based on the area of the sheared edge (ASTM D-
732). The shear strength of a structural adhesive is the
maximum shear stress in the adhesive prior to failure un-
der torsional loading (ASTM E-229). Methods for deter-
mining shear strength of timber are given in ASTM
D-143 and ASTM D-198.
B-27
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