Accession Number : AD0720396

Title :   Investigation of the Influence of Material Variables on Fatigue Mechanisms in Composites.

Descriptive Note : Final rept. 1 May-30 Nov 70,

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Personal Author(s) : Rao,P. N. ; Hofer,K. E. , Jr

Report Date : DEC 1970

Pagination or Media Count : 71

Abstract : This investigation pursued the following areas: 1. Determination of the staticand fatigue characteristics of a graphite/epoxy composite of current interestto the NASC. 2. Variation of temperature, stress mode & STRESS RATIO. 3.Utilization of optical and scanning electron microscopic techniques in conjunctionwith section of the samples to determine the feasibility of following theprogress of fatigue cracking in these graphite composites. 4. Variation offabrication processing (use of glass scrim cloth interlayers.). Improvedfatigue resistance of graphite composites with scrim cloth interleaving wasdemonstrated. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, FATIGUE(MECHANICS)), (*AIRFRAMES, COMPOSITE MATERIALS), EPOXY RESINS, CARBON FIBERS, GRAPHITE, GLASS TEXTILES, LAMINATES, CRACK PROPAGATION

Subject Categories : Aircraft
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE