Temperature and Time Effects on Yield and Failure of Unidirectional Glass Epoxy Composites,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1969
- Accession Number
- AD0861189
Entities
People
- A. E. Moehlenpah
- A. Preis
- O. Ishai
Organizations
- Monsanto