STUDY OF MICROMECHANICAL PROPERTIES OF ADHESIVE BONDED JOINTS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1968
- Accession Number
- AD0664170
Entities
People
- John L. Rutherford
- Michael C. Franzblau