Metallic Shell Parametric Study for Crush Behavior / Metal Kabuk Ezilme Davranışı Üzerine Parametrik Çalışma

The shell structures are the choice for structural application due to their weight to cost ratio. They are widely used in energy absorption in case of crash and impact events. The shells are widely used in automotives, nose cone of planes, war heads etc. The response of this shell structure are quite complex for loadings. The response depends on the geometry of the shell. This geometry could be a combination of many basics shape. The study was planned on basic shape like cylinder, combined geometry of cylinder and frusta and on geometry with special features. The force displacement graphs were discussed in details. The energy absorption capacities of the geometries were discussed. The analytical approach was also used to simulate the experiment. Özet: Kabuk yapıları yapısal uygulamalarda ağırlıklarına göre maliyetlerinden dolayı bir seçim olmaktadır. Bu yapılar çarpışma ve darbe durumlarında enerji sönümlemede yaygın olarak kullanılmaktadır. Bu kabuklar otomotivde, uçakların burun kısımlarında ve savaş başlıklarında ve buna benzeri yerlerde sıkça kullanılmaktadır. Bu kabuk yapısının yüklere karşı oluşturduğu tepkiler oldukça karmaşıktır ve tepkiler kabuk geometrisine bağlıdır. Çok çeşitli temel biçimlerin kombinasyonu olarak geometriler oluşabilir. Bu çalışma silindir gibi temel bir şekil, silindir ve kesik koni gibi kendine has özellikleri olan bir kombinasyon üzerine planlandı. Kuvvet yer değiştirme grafikleri ayrıntılı olarak ele alındı. Geometrilerin enerji emilimi kapasiteleri incelendi. Analitik yaklaşım aynı zamanda deneyleri simüle etmek için kullanılmıştır.

Keywords:

Geometrical shell, Apical angle, Large Deformations, Energy absorption, load-deflection, Finite Element analysis / Geometric kabuk, Apikal açı, Büyük deformasyonlar, Enerji emilimi, Yük-çökme sonlu elemanlar,

PDF

___

Nia and Hamedani. Comparative analysis deformations of thin walled tubes with various section geometries. Thin-Walled Structures. 48(12) (2010), 946-954. absorption and Alexander JM. An approximate analysis of the collapse of thin cylindrical shells under axial loading. Q J Mech Appl Math. 13(1) (1960), 10–5.
Chirwa EC. Theoretical analysis of tapered thin-walled metal inverbucktube. Int J Mech Sci. 35(3/4) (1993), 325–51.
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), 234–43.
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.
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.
Pugsley AG and Macaulay M. The large-scale crumpling of thin cylindrical columns. Quart J Mech Appl Math. 13(1) (1960), 1–9.
Alexander JM. An approximate analysis of the collapse of thin cylindrical shells under axial loading. Quart J Mech Appl Math. 13(1) (1960), 10–5.
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), 3269–88.
Transition from initial global bending to progressive buckling of tubes loaded statically and dynamically. Int J Impact Engng. 19(5/6) (1997), 415–37.
E8M - 09 Standard Test Methods for Tension Testing of Metallic Materials Engineering HyperWorks Dynamic Analysis of Structures in Three Dimension. Software Livermore, California 94550-1740. Year 2003 compiled by John O. Hallquist. Livermore
Software Technology Corporation, 2876
Waverly Way, Livermore, California 94550- 17 May 1998. 9 Livermore Corporation,
LsDyna theory manual, Chapter 6,