tREADME.md - slidergrid - grid of elastic sliders on a frictional surface
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       tREADME.md (1685B)
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            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