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September 2, 2007, 4:40 am
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Re: impact testing in plastics
The basic difference is that the rectangular prism sample in Izod
impacting is held on only one end, with the other end being impacted
(causing a bending fracture). In Charpy, both ends are held fixed and
the center is impacted (also a bending fracture mode). My experience
is in metals, but I believe Izod is usually an un-notched sample while
Charpy is usually notched. However, Charpy does have un-notched
samples within the test specification, per ASTM.
ASTM would be the the source for the fine details on these two