Fig. 4.
Formation and evolution of three perversions in a single bistrip. (A and B) Conformations and the corresponding strain energy distribution. A shows that the symmetric bucklings of the perversions are broken by the winding of the rightmost perversion where the strip length is reduced by 35%. In B, the energy peaks labeled as 1, 2, and 3 correspond to the perversions formed in the buckling. The green arrow in the last figure indicates energy elevation and therefore repulsion between perversions. The geometric parameters of the strips are , , , and following the notation labeled in Fig. 1.