Otto, M; Bouchaud, J-P; Claudin, P; Socolar, JES, *Anisotropy in granular media: Classical elasticity and directed-force chain network*,
Physical Review E Statistical, Nonlinear, and Soft Matter Physics, vol. 67 no. 3 1
(2003),
pp. 031302/1-031302/24 [0211015v2], [doi] .
**Abstract:**

*A general framework that covers both classical anisotropic elasticity theory and a generally anisotropic "pseudoelasticity" theory, that appears within a linearized treatment of directed-force chain networks is presented. It is shown how the formalism applies to the example of a triangular ball-and-spring network, indicating how spring stiffnesses must be chosen to access all possible regions of the general parameter space.*