NEHRP Clearinghouse
- Title
- Plasticity Models for Soils. Part I: Theory and Calibration. Part II: Comparison and Discussion.
- File
- PB81120065.pdf
- Author(s)
- Mizuno, E.; Chen, W. F.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., July 1980, 74 p.
- Identifying Number(s)
- CE-STR-80-12
- Abstract
- Three types of soil models are described in this report: (1) nonlinear elasticity material model with the Mohr-Coulomb or the Drucker-Prager surface as failure criterion; (2) Mohr-Coulomb type of elastic-plastic material model with two different sizes of elliptical hardening cap which are defined respectively on the tensile meridian plane and the compressive meridian plane; (3) Mohr-Coulomb type of elastic-plastic material model with an elliptical hardening cap whose size depends on the Lode angle theta. The following assumptions are made for the three types of models: (1) the linear elastic, hypoelastic or hyperelastic function is used in the elastic range for the isotropic or anisotropic material element; (2) the incremental plasticity theory is applied to calculate plastic strain increment during loading range. The concept of decomposition of stress state onto tensile meridian plane and compressive meridian plane is described.
- Keywords
- Stress strain diagrams; Tensile properties; Plastic properties; Earthquake engineering; Soil properties; Elastic properties; Soil mechanics