tREADME.md - slidergrid - grid of elastic sliders on a frictional surface (HTM) git clone git://src.adamsgaard.dk/slidergrid (DIR) Log (DIR) Files (DIR) Refs (DIR) README (DIR) LICENSE --- tREADME.md (1685B) --- 1 # slidergrid 2 3 Solves the kinematic behavior of a grid of bonded points sliding on a frictional 4 surface. 5 6 Author: Anders Damsgaard, anders@adamsgaard.dk 7 8 9 ## Notes 10 - [ ] Implement beam equation in slidergrid 11 - [x] change in displacement is wrong 12 - [x] velocity set in test.c is not transfered to main.c 13 - [x] forces set in slider.c are not transfered to main.c. I can set mass but not force 14 - [x] system stable only with elasticity 15 - [ ] viscosity should be serial to elasticity (Maxwell material). From Walker 2013: We set Young's modulus and Poisson's ratio for ice to 4.8 GPa and 0.4, respectively, following Gudmundsson (2011), who showed that these values make the behavior of a Maxwell material essentially identical to that of the more complicated Burgers material used by Reeh et al. (2003). We find that a viscosity of ν=10^15 Pa*s allows for noticeable departure from purely elastic behavior while remaining high enough to prevent underdamping, consistent with observations. Model sensitivity to these and other parameters is discussed in the next section. DEM implementation: Abbas et al 2007 16 - [ ] Add driving stress related to surface slope 17 - [ ] Add basal friction 18 19 ### Interaction outline 20 ``` 21 slider_neighbor_interaction (main.c) 22 bond_deformation (slider.c) // resolve strains 23 bond_parallel_deformation // resolve tension/compression 24 bond_normal_deformation // resolve shear/bending/twisting 25 slider_interaction (slider.c) // resolve forces and torques from strains 26 bond_parallel_kelvin_voight // resolve forces from tension/compression 27 bond_normal_kelvin_voight // resolve forces and torques from shear/bending/twisting 28 ``` 29