“…14 and 15 compare normalised limit pressures predicted using Eqs. (27), (35) and (37) (g ¼ 2= ffiffiffi 3 p ) with FE results based on the von Mises yield criterion due to Staat and Vu [12] for cases of k ¼ 2 and due to Zarrabi et al [16] for k ¼ 1.57. From the figures, Eq.…”