Abstract: To obtain the compressive behavior of honeycomb structures under out-of-plane static compression or impact load, based on the symmetric structure of the honeycomb structures and law of energy conservation, the sum of the needed energy for the plastic hinge rotation and energy for the Y-type honeycomb’s cell wall rotation is taken to be equivalent to the total absorbed energy based on the Y-type honeycomb cell. Based on this, average compressive stress constitutive equation under out-of-plane compression is deduced with Mises yield criterion and Tresca yield criterion. Considering the effect of strain rate on its mechanical characteristics based on the Cowper-Symonds model, dynamic average compressive stress calculating equation is deduced. A series of tests prove the correctness of the constitutive equation of the honeycomb structures under out-of-plane compression based on the Tresca yield criterion.

Key words: Average dynamic compressive stress, Average static compressive stress, Constitutive equation, Honeycomb structures, Out-of-plane compression