The indirect verification of Charpy machines was added to ASTM E23 more than 50 years ago as a means to reduce the scatter of Charpy test
results and ensure the correct operation and maintenance of impact machines .
The most popular test in North America is the notched Izod test while the counterpart that seems to be currently favored in Europe is the Charpy test
. They have some similarities and some distinct differences.
In each test piece a 45[degrees] notch was made to a depth of 2 mm, with a radius of 0.25 mm at the base of the notch in accordance with the specifications of the standard Charpy test
(ASTM International 2005).
on polymeric material is an impact test to a suddenly applied force, which measure the resistance to failure of a material.
In the Charpy test
, a pendulum swings into a notched specimen.
The analysis of an instrumented Charpy test
consists in the determination of characteristic time, force, displacement, and absorbed energy values corresponding to general yield, maximum force, initiation of unstable fracture, arrest of unstable fracture, and test termination (Fig.
To determine energy absorption, fracture toughness and fracture behavior of fibers reinforced resin, the Charpy test
is used .
The Charpy test
results clearly indicate thai we have a brittle stale of low dissipated energy during failure for the as-received samples (103 kJ/[m.sup.2]), which transforms lo a state that has a ductile characteristic with high dissipated energy (103 kJ/[m.sup.2]) when the sample is annealed above the [T.sub.g] of 147[degrees]C and quenched in an ice bath.
A 45[degrees] notch was made in each test piece, 2-mm deep, with a radius of 0.25 mm at the base of the notch in accordance with the specifications of the standard Charpy test
From the 3-mm sections, subsize Charpy impact test specimens measuring 2.5 x l0 x 55-mm were prepared, while 10 x l0 x 55-mm standard Charpy test
specimens were machined from the 12-mm sections.