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The fracture behavior of rubber‐toughened, short‐fiber composites of nylon 6,6
Author(s) -
Pecorini T. J.,
Hertzberg R. W.
Publication year - 1994
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750150303
Subject(s) - materials science , composite material , natural rubber , nylon 6 , fiber , toughness , brittleness , composite number , fracture toughness , glass fiber , polymer
This study critiques the use of both rubber particles and short‐glass fibers for the improvement of polymer fracture toughness ( K c ). Although dry neat nylon is brittle with only a moderate K c value (4.2 Mpa√m), additions of either second phase produce rising K R ‐curves and associated high K c values (8.1 Mpa√m for rubber‐toughened nylon, and 10.0Mpa√m for 17 vol% Glass‐fiber neat nylon). In the rubber ‐modified resin, the high K c value is associated with extensive plastic blunting at the crack tip. In the fiber‐reinforced neat resin, K c is improved due to a combination of fiber‐bridging and increased strength, the latter being associated with additional load carrying capacity of the fibers. When both rubber and fibers are added, however, no further increase in K c is noted ( K c = 9.3 Mpa√m for 17 vol% glass‐fiber rubber‐modified nylon). The extent of ductile blunting in the rubber + fiber resin is not as great as in the rubber‐only resin. Furthermore, the fracure strength of the rubber + fiber resin is not as high as the fiber‐only resin. The net result is a balance of properties for the rubber‐toughened composite.