Metallic shell parametric study for crush behavior

The shell structures are the choice for structural application due to their weight to cost ratio. They arewidely used in energy absorption in case of crash and impact events. The shells are widely used inautomotives, nose cone of planes, war heads etc. The response of this shell structure are quite complexfor loadings. The response depends on the geometry of the shell . This geometry could be a combinationof many basics shape. The study was planned on basic shape like cylinder, combined geometry ofcylinder and frusta and on geometry with special features. The force displacement graphs were discussedin details. The energy absorption capacities of the geometries were discussed. The analytical approachwas also used to simulate the experiment.

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1. Nia and Hamedani. Comparative analysis of energy absorption and deformations of thin walled tubes with various section geometries. Thin- Walled Structures. 48(12) (2010), 946- 954.
2. Alexander JM. An approximate analysis of the collapse of thin cylindrical shell s under axial loading. Q J Mech Appl Math. 13(1) (1960), 105.
3. Chirwa EC. Theoretical analysis of tapered thin- walled metal inverbucktube. Int J Mech Sci. 35(3/4) (1993), 32551.
4. Aljawi AAN and Alghamdi AAA. Inversion of frusta as impact energy absorber. In: Hassan MF, Megahed SM, editors. Current advances in mechanical design and production VII. New York: Pergamon, (2000), 23443.
5. Gupta PK. A study on mode of collapse of varying wall thickness metallic frusta subjected to axial compression. Thin- Walled Structures. 46 (2008), 561 571.
6. Mamalis W and Johnson W. The quasi- static crumpling of thin- walled circular cylinders and frusta under axial compression. Int J Mech Sci. 25(9/10) (1983), 713 32.
7. Pugsley AG and Macaulay M. The large- scale crumpling of thin cylindrical columns. Quart J Mech Appl Math. 13(1) (1960), 1 9.
8. Alexander JM. An approximate analysis of the collapse of thin cylindrical shells under axial loading. Quart J Mech Appl Math. 13(1) (1960), 105.
9. Wierzbicki T, Bhat SU, Abramowicz W, Brodkin D . Alexander revisited: A two folding elements model of progressive crushing of tubes. Int J Solids Struct. 29(24) (1992), 326988.
10. Abramowicz W and Jones N. Transition from initial global bending to progressive buckling of tubes loaded statically and dynamically. Int J Impact Engng. 19(5/6) (1997), 41537.
11. ASTM International: ASTM E8 / E8M - 09 Standard Test Methods for Tension Testing of Metallic Materials
12. HyperMesh11, A product of Altair Engineering HyperWorks
13. LS - DYNA, A Program for Nonlinear Dynamic Analysis of Structures in Three Dimension. Version 970. Livermore Software Technology Corporation, Livermore, California 94550- 1740. Year 2003
14. LsDyna theory manual, Chapter 6, compiled by John O. Hallquist. Livermore Software Technology Corporation, 2876 Waverly Way, Livermore, California 94550- 1740. May 1998.