Fig. 8

Example of wrong choices of stabilization parameters for Q4G1, \(h = 4\ell \). a Artificial instability polluting the mean field \(\vec {v}_0\); deformed configuration at \(t = 0.5\) obtained for \(\alpha _1 = \alpha _2 = 0\), where colour plot shows \(\vec {v}_0\cdot \vec {e}_1\). b Artificial instability in the micromorphic field polluting a buckling mode obtained for \(\beta _1 = 0\). Recall the structure of \({\varvec{\mathsf {K}}}^\mathrm {stab}\) in Eq. (34)