Numerical and experimental study of single-walled and double-walled columns under dynamic axial loading

This paper presents a numerical and experimental study of single-walled and double-walled square columns subjected to axial impact force. the impact behavior of the columns were numerically simulated using fem and also verified by experiment s. here,the effect s of inserting an inner wall to a single-walled column,to form a double-walled columns were evaluat ed. parametric study f or both types of columns were also carried out. the results showed that,the double-walled column have higher mean crushing force and better energy absorbing performance compared to single-walled column. further investigation has been conducted on the effect of mass and thickness to the mean crushing force. it was found that double-walled column has a better specific energy absorption compared to single-walled column of the same thickness. on the other hand,the double-walled column that has the same mass as the single-walled column did not perform as good as the previous one. th e parametric information obtained in this work will be very useful for modern automotive industry in designing front longitudinal members within an acceptable safety level.