Fig. 1

Graphical overview showing a typical load curve of the mechanical test consisting of five test cycles. The graphical course of preload, compression, relaxation, and unloading is shown in black. Relative compression (purple dot) was calculated from the indenter position at the end of dynamic compression of the 5th test cycle. The residual force was defined as the recorded load at the end of static compression of each test cycle. Load and residual force are shown on the left y-axis and indenter position and relative compression on the right y-axis