Radial Expansion Favors the Burrowing Behavior of Urechis unicinctus

Figure 3

The stress simulation result. (a) The radial movement of Urechis unicinctus places greater stress on the skin near the expansion area, especially for the sections with high curvature. (b) The internal and external pressures on the skin increase with the radial movement under the 4 cm depth sand, but the rate of increase decreases gradually. (c) As for the relationship between external pressure and drilling depth, the simulation results are very close to the experimental results, proving the reliability of the simulation.

(a)

(b)

(c)