On the Simulation of the Cyclic Mobility Effect with an ISA-Hypoplastic Model
The ISA-Hypoplasticity corresponds to an extended version of conventional Hypoplasticity to enable the simulation of some observed effects on cyclic loading. This extension offers novel features compared to the intergranular strain theory by Herle and Niemunis , including the incorporation of an elastic strain amplitude, to separate the elastic and plastic response, and the ability to reduce the plastic accumulation rate upon a larger number of cycles (\(N>10\)). In the present work, a modification to the ISA-hypoplastic model is described in order to enable the simulation of cyclic mobility effects exhibited by granular materials. The modification is based on a new state variable, able to detect paths at which the cyclic mobility effect is activated. With this information, some factors of the ISA-hypoplastic model are modified to deliver the proper response on paths showing cyclic mobility effects. Simulations examples are given to illustrate the new mechanism and a short analysis of the new parameters is also included.
- 8.Wichtmann, T.: Karlsruhe fine sand data-base. Technical report, Institute of Soil and Rock Mechanics (IBF). Karlsruhe Institute of Technology (KIT) (2015). http://www.torsten-wichtmann.de