Predeformation of R260 rail steel

Experimental data for [1,2], please see those references for details on specimen dimensions and load-cases. The script `plot_exp_results` can be used to plot the results in MATLAB. [1] Meyer, K. A., Ekh, M., & Ahlström, J. (2018). Modeling of kinematic hardening at large biaxial deformations in pearlitic rail steel. International Journal of Solids and Structures, 130–131, 122–132. https://doi.org/10.1016/j.ijsolstr.2017.10.007 [2] Meyer, K. A., Nikas, D., & Ahlström, J. (2018). Microstructure and mechanical properties of the running band in a pearlitic rail steel: Comparison between biaxially deformed steel and field samples. Wear, 396–397, 12–21. https://doi.org/10.1016/j.wear.2017.11.003