Transient Hygrothermal Stresses in a Traction Free Slab: Moisture-Temperature-Deformation Coupling Effects.
Abstract
This effort is a part of the Predictive Response Capability Development program with the objective of incorporating environment effect into design criteria. Previous work has shown that the effects of moisture and temperature interaction cannot be adequately treated by the simple (Fickian) diffusion theory. The coupling between moisture and temperature can significantly influence the resulting stress distribution in the solid, particularly under transient temperature boundary conditions. This paper considers a more complete theory in which deformation of the solid is also assumed to interact with the moisture-temperature diffusion process. The system of governing equations are solved numerically by iteration using Laplace transforms and the technique of finite elements. Coupling effects are analyzed for a traction free slab made of 5208 epoxy resin material subjected to a sudden change of moisture or temperature on the surface. Variations of moisture, temperature and stress with time and space variable are displayed graphically. The influence of coupling is found to vary in both time and space and increases as the specified transient moisture and temperature conditions become more severe. It also tends to delay the time for the hygrothermal stress to reach equilibrium. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1982
- Accession Number
- ADA117372
Entities
People
- George C. Sih
- M. T. Shih
Organizations
- Lehigh University