Accession Number : AD0673745

Title :   STUDY OF MICROMECHANICAL PROPERTIES OF ADHESIVE-BONDED JOINTS.

Descriptive Note : Final rept. 30 Jun 67-29 Jun 68,

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

Personal Author(s) : Hughes,Edward J. ; Rutherford,John L.

Report Date : AUG 1968

Pagination or Media Count : 76

Abstract : The basic purpose of this program was to demonstrate the feasibility and utility of making microstrain measurements to establish the mechanical properties of adhesives in metal-metal bonds. Loading modes were tension, compression and shear as a function of joint thickness and test temperature for selected adhesive systems. A high sensitivity capacitance-type extensometer was used to measure the deformation. The following accomplishments were achieved: (1) Tensile mechanical properties of epoxy adhesives in bulk form are different from the epoxy in a metal bonded joint. (2) The tensile modulus increases with: decreasing thickness, increasing strain rate, lower test temperature, higher modulus adherends. (3) The shear modulus increases with decreasing test temperature, increasing strain rate and is independent of thickness in the range of 0.004 to 0.040 inches. (4) The precision elastic limit and the viscoelastic behavior are affected by composition, test temperature and stress level. (5) Several systems showed 'work hardening.' These techniques and results have provided new insights into the deformation characteristics of epoxy adhesives in metal bonded joints. (Author)

Descriptors :   (*ADHESIVES, *BONDING), (*EPOXY RESINS, *BONDED JOINTS), TEST METHODS, METAL JOINTS, TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, SHEAR STRESSES, TEMPERATURE, DEFORMATION, MODULUS OF ELASTICITY, VISCOELASTICITY, FEASIBILITY STUDIES

Subject Categories : Adhesives, Seals and Binders
      Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE