Effect of Slot Geometry on the Impact Response of Square Column

Thin-walled square columns are generally used as impact energy absorber due to their versatile application, high energy absorption capacity and long stroke. However, the main drawback of existing square column is the high initial peak force. In this paper, a single slotted square column was proposed to reduce the initial peak force. Parametric study of the slot geometry on the impact response of square column was carried out. Non-linear finite element code Abaqus/Explicit was employed to evaluate the response of a single slotted square column subjected to impact in the axial direction. The study found that the slot geometry has a prominent effect on the impact response. However, the size of the slot which affects the structural stiffness of the column is not directly proportional to the reduction in initial peak force. It can be seen that a specific slot size is most effective in reducing the initial peak force at a particular impact speed. Overall, it can be deduced that a slot may enhance the impact performance of a standard square column and therefore could be incorporated in the design of energy absorber when designing for occupant and critical goods safety.