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Principal stretches (eigenvalues of ) of the anisotropic Cook’s membrane benchmark (Section 4.3) for the IBFE method using P1 elements with modified invariants and volumetric stabilization (νstab = 0.4) and the principal stretches for the FE (P1/P1) method. The solid DOF for the IBFE method are listed in the leftmost column, and the FE (P1/P1) method uses m = 36,920 solid DOF.
