Fig. 1. In (a) we illustrate the imposed ‘ramp’ shear deformation kðtÞ. The resulting scaled stress T12=l is given in (b) in the case of the neo-Hookean
incompressible material (solid) and the compressible Levinson–Burgess material with s ¼ 1 (dotted line) and s ¼ 10 (dashed line). The numerical
experiment is repeated in (c) for an imposed stress, with resultant shear indicated in (d).