Fig. 1.

Three reference fibers manually traced at low pressure (A) and high pressure (B). Dashed lines denote the fiber chord lengths while solid lines are the total fiber lengths. The engagements of the fibers are calculated as percent ratios of these two lengths. Corresponding DIC displacement vectors for low (C) and high pressures (D). Note that the displacement magnitudes decrease significantly for the high pressure. White scale bar ≈ 100 μm.