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FATIGUE CRACK PROPAGATION IN RESIN-FIBER COMPOSITES.
Final technical rept. 1 Jan-31 Dec 68,
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
Pagination or Media Count:
In order to gain a better understanding of fatigue failure processes in nonmetallic matrix composites, an exploratory study of fatigue crack propagation in both boron and glass fiber reinforced epoxy resins was begun. Under the test conditions employed the epoxy resin ERL 2256 was found to be extremely brittle and to possess limited capacity for stable crack extension. Due to the brittle behavior of the epoxy resin and the inability to maintain stable fatigue crack propagation, a series of fatigue tests were performed on several different polymer materials representing different classes of mechanial response. Fatigue crack propagation rates between 5 x 10 -6 incycle and 4 x 10 -incycle were measured in nylon, polycarbonate, ABS reins, low-density polyethylene and polymethylemethacrylate. A STRONG CORRELATION WAS FOUND BETWEEN THE FATIGUE CRACK PROPAGATION RATE AND THE STRESS INTENSITY FACTOR PREVAILING AT THE ADVANCING CRACK TIP. Author, modified-PL
APPROVED FOR PUBLIC RELEASE