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Instrumented izod impact testing
Author(s) -
Slavin S. E.,
Beswick G. T.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070490613
Subject(s) - izod impact strength test , hammer , materials science , impact energy , composite material , brittleness , cushion , padding , impact factor , structural engineering , impulse (physics) , impact , fracture (geology) , forensic engineering , ultimate tensile strength , engineering , physics , quantum mechanics , political science , law , metallurgy
The notched Izod impact test is the most prevalent technique used to characterize the effects of high‐impulse loads on polymeric materials. In order to extract ancillary information concerning fracture properties in addition to the total fracture energy, an instrumented version of this test is examined. Oscillations in the load signal, which severely degraded the utility of the data for materials fracturing in a brittle manner, are determined to be the result of specimen vibration caused by the impact of the hammer. Placement of a felt cushion on the face of the hammer is shown to eliminate these oscillations and the effects of the felt on the load‐time information are shown to be minimal. Finally, peak load data extracted from instrumented Izod tests employing felt padding, is used to determine the stress‐intensity factor for several plastics of commercial interest. © 1993 John Wiley & Sons, Inc.