The paper deals with strain-localization instabilities due to strain-softening which result from distributed damage such as cracking. The continuum is local but is enhanced by a localization limiter consisting of a lower bound on the minimum dimension of the strain-localization region, which is regarded as a material property. The material is described by Drucker-Prager plasticity with strain-softening that is caused by yield limit degradation. A numerical parameter study of the critical states is made for a broad range of material properties as well as various initial stress states and relative sizes of the strain-softening region. The flatter the ellipsoidal domain, or the larger the size of the body (layer thickness), the smaller is found to be the strain-softening slope magnitude at which the critical state is reached. A softening Drucker-Prager material is found to be stable even for planar-band localizations in infinite continuum for a certain range of softening material parameters.
|Original language||English (US)|
|Number of pages||10|
|Journal||American Society of Mechanical Engineers, Applied Mechanics Division, AMD|
|State||Published - Dec 1 1988|
ASJC Scopus subject areas
- Mechanical Engineering