Mechanical Properties of Adhesively Bonded Aluminum Structures Protected with Hydration Inhibitors,

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Abstract:

The use of several amino phosphonic acids as hydration inhibitors to improve the properties of adhesively bonded aluminum structures has been investigated using T-peel, double-lap-shear, and wedge tests. Each of the inhibitors tested was found to be compatible with epoxy adhesives in a dry environment. Most were also compatible in a hot, humid environment. Examination of both sides of the propagated crack in wedge test specimens treated with nitrilotris methylene phosphonic acid NTMP showed that hydration of the oxide could be slowed sufficiently so that crack propagation occurred prior to it. In this case, the weakest link was the coupling of the inhibitor to the adhesive. Inhibitors designed to strengthen this coupling have been synthesized and are currently being tested.

Author(s):
Davis, G. D. ; Hearn, J. S. ; Matienzo, L. J. ; Venables, J. D.
Author Organization(s):
MARTIN MARIETTA LABS BALTIMORE MD
Pagination:
0058

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MML-TR-84-54(C)
Contract/Grant Number(s):
N00014-80-C-0718
 Subject Terms
Joint Capability Areas:
JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_4.6_Engineering; JCA_4.6.1_General Engineering; JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_1.2.5_Lessons Learned; JCA_3.2_Engagement; JCA_3_Force Application; JCA_5_Command and Control; JCA_6.1.1_Wired Transmission; JCA_6.3_Net Management
Communities of Interest:
Advanced Electronics
Descriptor(s):
*STRENGTH(MECHANICS), *BONDED JOINTS, *ADHESIVE BONDING, SHEAR PROPERTIES, COUPLING(INTERACTION), INTERFACES, STRUCTURES, FAILURE, TEST METHODS, CRACK PROPAGATION, ALUMINUM OXIDES, ALUMINUM, INHIBITORS, AMINO ACIDS, PEEL STRENGTH, PHOSPHONIC ACIDS, HYDRATION
Field(s)/Group(s):
Adhesives, Seals and Binders, Metallurgy and Metallography, Mechanics
Report Date:
1984 Nov 01