Environmental Failure of Adhesive Bonding in Composites.
Abstract
The adaptation of the Andrews-Stevenson (A-S) adhesion test, previously used for epoxy to metal adhesive systems, for epoxy-to-glass bonds has been achieved for epoxy resins having relatively low T sub g's (e.g. Epikote 828, T sub g = 71 C). Partial success has been achieved for high T sub g resins (e.g. SP250). This adaptation has required considerable sophistication of test-piece geometry to prevent thermal contraction stresses shattering the glass substrates during specimen preparation. The effect of water immersion at 80 C for various periods of time has been studied for the system Epikote 828 pyrex glass in the absence of coupling agents. The fracture mode becomes increasingly cohesive as immersion time increases and the peak in the curve of fracture energy versus crack speed falls progressively. Using Andrews' generalized theory, the adhesive fracture energy theta can be separated into its interfacial energy and dissipative components.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1980
- Accession Number
- ADA085878
Entities
People
- C. Vlachos
- E. H. Andrews
- H. A. Majid
- Ho Ping Sheng
Organizations
- Queen Mary University of London