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We analyse the general solutions for the stress field in planar annuli ofisostatic media, a model often used for marginally rigid granular materials inCouette cells. We demonstrate that these solutions are much richer than inrectangular symmetries. Even for uniform media, stress chains are found tocurve, broaden away from the stress source, attenuate and leak stress into acone of influence. Most spectacularly, stress chains may bend back and transmitforces oppositely to the original direction. None of these phenomena arises insolutions for uniform media in Cartesian coordinates. We further analysenon-uniform media, which exhibit chain branching and stress leakage from thechains. These results are directly relevant to the many experiments on granularmaterials, carried out in Couette cells. They also shed light on, and aresupported by, hitherto unexplained experimental observations of curved andback-bending chains, which we point out. In particular, we use our results toprovide a new interpretation for the pattern of slip lines observedexperimentally.

Bending back stress chains and unique behaviour of granular matter in cylindrical geometries