I'm currently performing simulations related to fixed fixed condition in plane buckling of corrugated sandwich panels. I have several samples, where certain samples show global buckling behavior while some show local buckling behavior. I do not have problem related global buckling as eigenvalue load is close to the theoretical value, but for samples with local buckling i get improper answers on Ansys Workbench. I'm currently implementing SOLID186 for both the face sheets and core. Can you please provide any support related to this matter.