Energy absorption of pressurized thin-walled circular tubes under axial crushing

By pressurizing cellular materials, honeycombs, or thin-walled structures, their energy absorption can be greatly enhanced, and this enhancement can be controlled by the applied pressure. This concept shines light on the possibility of achieving adaptive energy absorption. To investigate the effect of internal pressure on energy absorption of thin-walled structures, this paper presents a study of axial crushing of pressurized thin-walled circular tubes. In the experiments, three groups of circular tubes with radius/thickness ratio R/t=120–200 were axially compressed under different pressurizing conditions. The results show that with an increase of internal pressure, the deformation mode switches from diamond mode with sharp corners to that with round corners, and eventually to ring mode. In diamond mode, the mean force of the tubes increases linearly with internal pressure. The enhancement comes from two mechanisms: direct effect of pressure and indirect effect due to interaction between pressure and tube wall. After the deformation switches to ring mode, the enhancement resulting from the second mechanism becomes weaker. Based on experimental observations, the deformation mode, energy dissipation mechanisms as well as interaction between internal pressure and tube wall are analyzed theoretically and the theoretical results are in good agreement with the experimental ones.

[1]  O. Hopperstad,et al.  Static and dynamic crushing of square aluminium extrusions with aluminium foam filler , 2000 .

[2]  A. G. Pugsley,et al.  ON THE CRUMPLING OF THIN TUBULAR STRUTS , 1979 .

[3]  T. Bielecki,et al.  Adaptive car buffer: the concept, design tools and perspectives , 2001, 2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Proceedings (Cat. No.01TH8556).

[4]  Norman Jones,et al.  Dynamic axial crushing of circular tubes , 1984 .

[5]  Stelios Kyriakides,et al.  Plastic buckling of tubes under axial compression and internal pressure , 2006 .

[6]  Cezary Graczykowski,et al.  CONTROLLED IMPACT ABSORPTION IN ADAPTIVE PRESSURIZED STRUCTURES. , 2004 .

[7]  K.R.F. Andrews,et al.  Classification of the axial collapse of cylindrical tubes under quasi-static loading , 1983 .

[8]  Norman Jones,et al.  Dynamic progressive buckling of circular and square tubes , 1986 .

[9]  Raphael H. Grzebieta,et al.  An alternative method for determining the behaviour of round stocky tubes subjected to an axial crush load , 1990 .

[10]  W. Abramowicz,et al.  Axial crushing of foam-filled columns , 1988 .

[11]  Tomasz Wierzbicki,et al.  A moving hinge solution for axisymmetric crushing of tubes , 1986 .

[12]  Dimitrios E. Manolakos,et al.  Crashworthy characteristics of axially statically compressed thin-walled square CFRP composite tubes: experimental , 2004 .

[13]  P D Soden,et al.  Inextensional collapse of thin-walled tubes under axial compression , 1977 .

[14]  W. Abramowicz,et al.  Alexander revisited—A two folding elements model of progressive crushing of tubes , 1992 .

[15]  Jan Holnicki-Szulc,et al.  Adaptive crashworthiness concept , 2004 .

[16]  T. Wierzbicki,et al.  Axial Crushing of Multicorner Sheet Metal Columns , 1989 .

[17]  J. M. Alexander.  AN APPROXIMATE ANALYSIS OF THE COLLAPSE OF THIN CYLINDRICAL SHELLS UNDER AXIAL LOADING , 1960 .

[18]  S. Reid,et al.  Static and dynamic axial crushing of foam-filled sheet metal tubes , 1986 .

[19]  A. A. Singace,et al.  On the Eccentricity Factor in the Progressive Crushing of Tubes , 1995 .

[20]  G. Lu,et al.  Quasi-static axial compression of thin-walled circular aluminium tubes , 2001 .

[21]  T. Y. Reddy,et al.  Axial compression of foam-filled thin-walled circular tubes , 1988 .

[22]  WJ Willem Witteman,et al.  Improved vehicle crashworthiness design by control of the energy absorption for different collision situations , 1999 .

[23]  N. K. Gupta,et al.  An analysis of axi-symmetric axial collapse of round tubes , 1995 .