Factors Controlling the Strength of Composite Structures.
Abstract
Room temperature fracture toughness, and stress corrosion cracking (SCC) properties adhesive bonds were studied using aluminum, stainless steel, a titanium alloy, brass and glass adherends with several simple epoxy resins hardened with TEPA, HHPA, MPDA or NMA: the use of A1100 silane finish was found to improve the bonding performance of all adherends except aluminum. The effect of temperature on fracture toughness was measured for the TEPA and HHPA cured DER332 resin adhesives as well as on one tough commerical system. The behavior of the commercial system was opposite to that seen for the simple systems. Increased cracking rate applied to a normally crosshead-driven adhesive system showed a rate discontinuity at 10 feet/second. Toughness of commerical adhesives using aluminum adherends was between 1.5 and 20 lbs/in. All commerical materials were immune to room temperature SCC when properly bonded using a suitable primer. (Author, modified-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1971
- Accession Number
- AD0727600
Entities
People
- E. J. Ripling
- Sheldon Mostovoy
Organizations
- Materials Research Laboratory