Durability Predictions for Adhesively Bonded Joints in Humid Environments
Abstract
The research objective of this study was to develop an understanding of the cohesive failure of adhesively bonded joints under load an in aggressive environments. Such an understanding could then be used to predict the durability of adhesively bonded joints in humid environments. The problem was to have been approached by first examining the diffusion kinetics and then modeling the deformation and failure behavior as a function temperature and moisture. Although only one adhesive was to have been considered in the study, the first adhesive had to be abandoned mid-way through the program (after its diffusion characteristics had been studied) when creep deformation experiments revealed an unexceptable degree of scatter due to random shear banding After some development, a suitable second adhesive was found, but there was not enough time to completely characterize its diffusion, deformation and failure behavior as a function of temperature and moisture. In the analytical portion of the project, finite element analyses were conducted to optimize various specimens employed in the experimental program. In addition, several thermo-mechanical models for rate-dependent materials with sensitivity to hydrostatic pressure were explored. An extended Prager Drucker plasticity model reproduced the data obtained to date.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 29, 1993
- Accession Number
- ADA271177
Entities
People
- G. J. Rodin
- K. M. Liechti
Organizations
- University of Texas at Austin