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One of the most important problems that energy absorbers as thin-walled structures have been considered by designers, is the amount of energy absorption and the initial peak crushing load. In this paper, the crashworthiness of end capped circular aluminum tubes under axial compression is investigated. In this design, in order to reduce the initial maximum crushing load, holes were created in the outer surface of the adsorbent with specified distances along the tube. The presence of annular holes as a imperfection in the absorber prevents the sudden load applied to the main structure and the occupants. In this study, using numerical simulation by ABAQUS software, the effect of the presence of holes, angle and direction of applied oblique load has been studied on the crashworthiness of end capped tubes. Also, in order to validate the numerical simulation results, a number of experimental tests were performed which showed good agreement. The results showed that the applied oblique load with an angle of 10 degree and the opposite direction of the holes is effective on the state of collapse, energy absorption and reduction of initial peak load, and the angles of 20, 30 and 40 degree do not have significant changes in initial peak force and energy absorption.