Any of several impact tests (such as the Izod or the Charpy test) which measure the energy absorbed in breaking a notched bar of metal or similar material with a single blow.
Origin
Early 20th century.
Definition of notched-bar test in US English:
notched-bar test
noun
Engineering
Any of several impact tests (such as the Izod or the Charpy test) which measure the energy absorbed in breaking a notched bar of metal or similar material with a single blow.