In this paper, the CCD digital camera was used to take photographs of the shape change of the dent for sharp-dented 6061-T6 aluminum alloy tubes subjected to cyclic bending. The dent depths were 0.3, 0.6, 0.9 and 1.2 mm and the controlled curvatures were 0.35 m-1 for cyclic bending. The images taken by the CCD digital camera were analyzed by image processing software from the Matlab to obtain more clear images. In the theoretical simulation aspect, by using proper stress-strain relationship, mesh element, boundary condition and loading condition, the finite element ANSYS was employed to simulate the dent deformation of sharp-dented circular tube subjected to cyclic bending. The analysis cycles included 1st, 5th, 10th and 15th cycles. The deformations at the deepest location of the dent at the negative maximum curvature (-0.35 m-1) subtracted the deepest location of the dent at positive maximum curvature (+0.35 m-1) to obtain the amount of the maximum deformation at the dent. Finally, the images taken by the CCD digital camera were compared with the ANSYS simulation. It is shown that the theoretical simulation can properly represent the experimental results

Full text: IJEIR_2404_FINAL.pdf