|
Stiffness
In Flexure
Stiffness
In Flexure is determined by clamping a specimen into the
apparatus shown here and a 1% load applied manually. The
deflection scale is set at zero. The motor is engaged and
the loading increased, with deflection and loading figures
recorded at intervals. A curve is drawn of deflection versus
load, and from this is calculated stiffness in flexure in
pounds per square inch.
This
test does not distinguish the plastic and elastic elements
involved in the measurement and therefore a true elastic
modulus is not calculable. Instead, an apparent value is
obtained and called "stiffness in flexure." It is a measure
of the relative stiffness of various plastics and taken
with other pertinent property data; is useful in material
selection. ASTM D-747.
|