Accession Number : AD0664170

Title :   STUDY OF MICROMECHANICAL PROPERTIES OF ADHESIVE BONDED JOINTS.

Descriptive Note : Quarterly progress rept. no. 2, 1 Oct-31 Dec 67,

Corporate Author : GENERAL PRECISION SYSTEMS INC LITTLE FALLS N J AEROSPACE RESEARCH CENTER

Personal Author(s) : Franzblau,Michael C. ; Rutherford,John L.

Report Date : 15 JAN 1968

Pagination or Media Count : 40

Abstract : The second quarterly report gives a program to measure the mechanical properties of adhesive bonded joints, utilizing advanced high precision microstrain techniques. During the current report period, progress was noted as follows: (1) The tensile behavior of Epon 9601, a sheet adhesive, was investigated for several sheet thicknesses. The deformation was found to be viscoelastic and the dielectric constant was strain sensitive. (2) The effect of temperature on the tensile properties of Epon 9601 was studied in the temperature range -10 to 200F. The effective tensile modulus increased at low temperatures and the deformation became elastic. At elevated temperatures, plastic flow was observed at low stresses. (3) Tensile tests were made with the Epon 828/Versamid 140 system using aluminum adherends instead of stainless steel. This change resulted in higher fracture stresses and cohesive failure as opposed to adhesive failure for the stainless steel. (4) The shear moduli and fracture stresses of several thicknesses Epon 9601 were measured using the napkin ring torsion apparatus. (5) The dependence of the effective tensile modulus on joint thickness for the system Epon 828/Versamid 140 is explained on the basis of a layered structure within the joint, which influences its mechanical properties. (Author)

Descriptors :   (*BONDED JOINTS, MECHANICAL PROPERTIES), (*ADHESIVES, BONDED JOINTS), MICROSTRUCTURE, SHEETS, TENSILE PROPERTIES, SHEAR STRESSES, COMPRESSIVE PROPERTIES, THICKNESS, FRACTURE(MECHANICS), MODULUS OF ELASTICITY, DEFORMATION, ELASTIC PROPERTIES, STRAIN(MECHANICS), EPOXY RESINS, ALUMINUM, BONDING, TEMPERATURE, TORSION METERS

Subject Categories : Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE