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Charpy impact fracture testing—a precise measure of ductile‐brittle transition in a filled polymeric system
Author(s) -
Cahill R. W.
Publication year - 1981
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760211808
Subject(s) - charpy impact test , materials science , relative humidity , composite material , toughness , fracture toughness , transition temperature , fracture (geology) , brittleness , humidity , thermodynamics , physics , superconductivity , quantum mechanics
The fracture toughness of a filled nitrile rubber/phenolic polymeric system was assessed by means of ductile‐to‐brittle transition temperature (DBTT) as measured by the Charpy impact method to search for sampling location dependencies of toughness in structures. This investigation established the relationship between the Charpy DBTT and exposure to selected relative humidity (RH) for the filled polymer from the three lots. Charpy fracture tests of specimens subjected to a low RH environment (15 percent) had higher DBTTs than their counterparts exposed to a high RH condition (70 to 75 percent). Charpy specimens of this material exhibited a 9 to 22°F change in DBTT which depended upon the manufacturer and the conditioning period for a corresponding change of 60 percent RH. The change in DBTT with relative humidity was found to be reversible; initial fracture behavior could be restored to samples from the low RH (15 percent) station by equilibrating at a high RH (75 percent) level.