Accession Number : ADA304525

Title :   Long-Term Load-Deformation Behavior and Strength of Elastomer-Based Adhesives,

Corporate Author : FOREST PRODUCTS LAB MADISON WI

Personal Author(s) : River, Bryan H. ; Gillespie, Robert H.

PDF Url : ADA304525

Report Date : APR 1979

Pagination or Media Count : 49

Abstract : Many new adhesives with promising capabilities for use in building construction have time-dependent mechanical properties. Their use has been limited primarily to nonstructural uses due to lack of knowledge about these properties. This study involved developing a useful test method to evaluate the long-term strength and stiffness of flexible adhesives, and exploring some methods of evaluating adhesive time dependency. A versatile test apparatus was developed for this purpose, capable of producing creep, stress relaxation, and creep-rupture strength data. A feature of the apparatus is automated collection of data at selected intervals in a format for computer processing. Strain-time data from preliminary tests of five adhesives were analyzed for fit to algebraic expression, creep-modulus versus time, isochronous stress-strain behavior, and creep-rupture strength. Problems encountered particularly in the equipment development stages are described and suggestions made for future improvements. In spite of the experimental difficulties, useful data were collected and are presented in a format useful to designers of structures that use flexible adhesives in structural joints.

Descriptors :   *STRESS STRAIN RELATIONS, *DEFORMATION, *ADHESIVES, TIME DEPENDENCE, STRESS TESTING, STRUCTURAL MECHANICS, STIFFNESS, MODULUS OF ELASTICITY, ELASTOMERS, RUPTURE, STRENGTH(MECHANICS), SHEAR STRESSES, CREEP, DATA ACQUISITION, POLYURETHANE RESINS, FLEXIBLE MATERIALS, STRUCTURAL COMPONENTS, CONSTRUCTION MATERIALS, CREEP STRENGTH, STRESS RELAXATION.

Subject Categories : Adhesives, Seals and Binders
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE