Charpy flexural impact test and notched flexural impact test
The Charpy flexural impact test is a quick and easy test for a comparative material assessment. Among other things, it is used to investigate the effect of changed formulation, compounding or injection molding conditions on the test specimen. In the Charpy test, the test specimens are subjected to stress in a set-up similar to the 3-point loading test and, once sufficiently brittle, are broken. The use of notched test specimens is necessary in order to produce a break in ductile materials. The test is possible within a temperature range from –60 ºC to +23 ºC.
Results of the test method:
Charpy impact strength of an unnotched specimen aiU [KJ/m2]
Charpy impact strength of a notched specimen aiN [KJ/m2]
incl. break assessment at corresponding temperature and where applicable a rubber-glass transition
Key to method:
Example: ISO 179/1eA
1 Type of test piece:
Flat test piece
with measurements l x b x h
e Direction of impact:
e = edgewise
f = flatwise
A Notch depth:
U = unnotched
A = notch with 0.25 mm radius
B = notch with 1.00 mm radius
C = notch with 0.10 mm radius
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