Application of a Third-Invariant Plasticity Theory to Concrete and Soils.
Abstract
A viscoplastic constitutive model for frictional materials has been formulated. The approach is classical except that a nonassociated flow rule, and third invariants of stress and strain instead of the more conventional second invariants, are used. Theoretical and experimental results indicate good correlation for limit states and reasonable comparisons for deformations with a model that contains a small number of material parameters. Additional work is needed to improve the hardening and softening features of the model. Exploratory investigations were also conducted on the possibility of incorporating strain rate and cracking into the model. Preliminary results indicate that for both effects it may be possible to use the existing viscoplastic framework to provide a compact but comprehensive algorithm. If an interface is modeled as an existing crack, it may also be possible to handle interaction problems with the model. The primary focus of subsequent research wil involve cracking, rate effects, and interface phenomena. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1983
- Accession Number
- ADA127079
Entities
People
- Howard L. Schreyer