Fig. 2: Depth-dependent dynamic nanoindentation measurements of D. tenuis brachiopod shell samples at different hydration levels.
From: Mechanical adaptation of brachiopod shells via hydration-induced structural changes
Plotted is the dependence of shell hardness HIT (red, right) and Young’s modulus EIT (blue, left) as a function of indentation depth for an atmospherically dry shell sample (top, filled symbols) and a fully hydrated shell sample (bottom, open symbols). Measurements were conducted in continuous stiffness mode up to a maximum force of 30 mN. Shown is the average over eight indentation measurements.
