In order to better understand the nonlinear and anelastic behavior of non-cohesive soils under undrained cyclic loading, an animation of an undrained cyclic triaxial test on Karlsruhe fine sand (test TCUI19) was created with the help of Python. The data basis for this was taken from [1].

The animation can be watch under the following Link

[1] Wichtmann, T., Triantafyllidis, Th. (2016): An experimental data base for the development, calibration and verification of constitutive models for sand with focus to cyclic loading. Part I: tests with monotonic loading and stress cycles. Acta Geotechnica, Vol. 11, No. 4, pp. 739-761, DOI: 10.1007/s11440-015-0402-z