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Fatigue crack growth behavior and mechanism of closed‐cell PVC foam
Author(s) -
Poapongsakorn P.,
Kanchanomai C.
Publication year - 2013
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.23433
Subject(s) - materials science , fracture mechanics , composite material , creep , crack closure , crack growth resistance curve , fracture (geology) , paris' law , mechanics , physics
The applicability of linear‐elastic fracture mechanics parameters (Δ K and K max ), elastic–plastic fracture mechanics parameter (Δ J ), and time‐dependent fracture mechanics parameter ( C *) to characterize fatigue crack growth (FCG) rate of closed‐cell polyvinyl chloride foam was investigated in the present work. The effect of stress ratios ( R = 0.1 and 0.4) on FCGs was observed when the Δ K , K max and Δ J were used as fracture mechanics parameters. As a fracture mechanics parameter that combines Δ K and K max , the K * successfully characterized FCGs ( da/dN ) at R = 0.1 and 0.4. While, a time‐dependent fracture mechanics parameter ( C *) successfully correlated da/dt of creep crack growth (CCG) test, but it failed to correlate da/dt of FCG tests. The FCGs at both R = 0.1 and 0.4 were cyclic dependent, while the CCG was time dependent. For cyclic‐dependent crack growth, the interaction between polymer‐chain scission and small scale crack‐tip blunting was the main mechanism, whereas the interaction between polymer‐chain pullout and large scale crack‐tip blunting dominated fracture process for time‐dependent crack growth. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers