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Fig. 17. Influence of the material hardening on the buckling modes for tubes with L 1⁄4 450 mm subjected to an impact with V0 1⁄4 8:5 m/s and G 1⁄4 138:4 kg. (a) Material Mat1 and (b) Material Mat2.
FROM:
D. Karagiozova (1) and Marcílio Alves (2)
(1) Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Block 4, Sofia 1113, Bulgaria
(2) Department of Mechatronics and Mechanical Systems Engineering, University of São Paulo, São Paulo, SP 05508-900, Brazil
“Transition from progressive buckling to global bending of circular shells under axial impact––Part I: Experimental and numerical observations”, International Journal of Solids and Structures, Vol. 41, Nos. 5-6, March 2004, pp. 1565-1580, doi:10.1016/j.ijsolstr.2003.10.005
ABSTRACT: The influence of impact velocity and material characteristics on the dynamic buckling response of circular shells subjected to axial impact loads is studied. It is shown experimentally that the critical buckling length, which marks the transition between progressive and global buckling of aluminium alloy circular tubes, is significantly influenced by the axial impact velocity. A finite element analysis is undertaken to further explore the effects of material yield stress, strain hardening and strain rate sensitivity on the transition phenomenon. It is observed that circular tubes made of ductile alloys with a high yield stress and low strain hardening characteristics have a better performance as energy absorbers than tubes made of alloys with a low yield stress and high strain hardening characteristics. Theoretical analysis of some particular features of the dynamic buckling transition is presented in Part II [International Journal of Solids and Structures (2004)].
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