Factors Controlling the Strength of Composite Structures.

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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 feetsecond. Toughness of commerical adhesives using aluminum adherends was between 1.5 and 20 lbsin. All commerical materials were immune to room temperature SCC when properly bonded using a suitable primer. Author, modified-PL

Author(s):
Mostovoy, Sheldon ; Ripling, E. J.
Author Organization(s):
MATERIALS RESEARCH LAB INC GLENWOOD ILL
Descriptive Note:
Final rept. 1 Mar 70-28 Feb 71,
Pagination:
0083

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N00019-70-C-0137
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*BONDED JOINTS, EPOXY RESINS, ALUMINUM, BRASS, GLASS, CURING AGENTS, ANHYDRIDES, STRESS CORROSION
Field(s)/Group(s):
Couplers, Fasteners and Joints
Report Date:
1971 Feb 28