Split rate fatigue propagation in polymer blends

C. Koster, V. Altstädt, H. H. Kausch, W. J. Cantwell

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The long-term properties of PαSAN/PMMA blends have been examined by conducting fatigue tests on a fracture mechanics-type specimen. Initial testing on the individual constituents showed that the crack initiation threshold was higher in the PMMA polymer than in the PαSAN system. Alloying these polymers resulted in the crack initiation thresholds between those of the two base polymers. A scanning electron microscopy study of the fracture surfaces indicated that fatigue loading resulted in the formation of well defined striations, the spacing of which depended on the crack velocity and morphology. The fatigue striations in a fine-structured blend remained straight and did not appear to be modified by the presence of the secondary phase. Crack extension in a coarser structure depended upon the characteristics of the particular phase in which the crack was extending. It was observed that the striations in the less ductile PαSAN phase were more closely spaced as well as being curved. It is believed that the crack propagated more rapidly in this phase resulting in a split rate crack velocity within the polymer blend.

Original languageBritish English
Pages (from-to)243-248
Number of pages6
JournalPolymer Bulletin
Volume34
Issue number2
DOIs
StatePublished - Feb 1995

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