Foam　concrete　exhibits　long　stress　plateau　with　increasing　strain　subjected　to　compression　and　absorbs　a　considerable　amount　of　energy,　making　them　promising　for　building　and　structure　protection.　In　the　present　study,　hexagonal　concrete　honeycombs　are　employed　to　approximately　represent　foam　concrete,　whose　response　and　energy　absorption　subjected　to　dynamic　in-plane　compression　are　investigated　with　smooth　particle　hydrodynamics　method.　The　response　modes　under　low　to　high　velocity　crushing　are　numerically　investigated,　with　which　the　critical　velocity　separating　quasi-static　response　and　progressive　collapse　mode　is　determined.　Furthermore,　the　dynamic　energy　absorption　capacity　is　examined　and　discussed.