Accession Number : AD0700434

Title :   FATIGUE CRACK PROPAGATION IN RESIN-FIBER COMPOSITES.

Descriptive Note : Final technical rept. 1 Jan-31 Dec 68,

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s) : Hertzberg,Richard W. ; Manson,John A. ; Nordberg,Hans

Report Date : NOV 1969

Pagination or Media Count : 25

Abstract : 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 in/cycle and 4 x 10 -in/cycle 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)

Descriptors :   (*REINFORCED PLASTICS, CRACK PROPAGATION), COMPOSITE MATERIALS, EPOXY RESINS, GLASS TEXTILES, BORON, FATIGUE(MECHANICS), FRACTURE(MECHANICS), NYLON, POLYESTER PLASTICS, POLYETHYLENE PLASTICS, STYRENE PLASTICS, ACRYLIC RESINS, ACRYLONITRILE POLYMERS

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE