Abstract
The hat cross-sectional tube was impacted to the rigid plate under the dynamic condition, which exhibited a progressive buckling pattern with multi lobe. The effect of the inertial force arising during impact on the onset of the first buckling lobe was investigated. The inertia force was induced by the solid mass attached to the tube wall. Impact experiment with the aid of drop-hammer was carried out. Experimental observation with a high-speed video camera demonstrated that the position of the first buckling lobe was successfully controlled by the inertial force.
