Accession Number : AD0861189

Title :   Temperature and Time Effects on Yield and Failure of Unidirectional Glass Epoxy Composites,

Corporate Author : MONSANTO RESEARCH CORP ST LOUIS MO

Personal Author(s) : Ishai, O. ; Moehlenpah, A. E. ; Preis, A.

Report Date : JUL 1969

Pagination or Media Count : 36

Abstract : Unidirectionally reinforced fibrous glass-epoxy composite specimens cut at angles 0 degrees and 90 degrees to the fiber axis were tested to failure under tension and compression at different temperatures and strain rates. Results indicated that longitudinal strength is practically unaffected by temperature whenever the epoxy matrix is at its glassy or rubbery state. A significant drop in strength with increasing temperature is evident at the glassy-rubbery transition region. Failure of transverse specimens under tension occurs brittlely and is associated with interfacial fiber-matrix separation when specimens are tested at low temperatures and high strain rates, but is predominantly ductile and associated with matrix failure when specimens are tested at higher temperatures and lower strain rates. The temperature at which the brittle-to-ductile transition occurs with increasing strain rate was found to be significantly higher for the fiber-reinforced material than the matrix. (Author)

Descriptors :   (*COMPOSITE MATERIALS, REINFORCED PLASTICS), (*REINFORCED PLASTICS, MECHANICAL PROPERTIES), YIELD POINT, FAILURE(MECHANICS), EPOXY RESINS, GLASS TEXTILES, DUCTILE BRITTLE TRANSITION, THERMAL PROPERTIES, TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, STRESSES, STRAIN(MECHANICS), FRACTURE(MECHANICS), GRAPHICS.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE