Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31819
A Study on Mode of Collapse of Metallic Shells Having Combined Tube-Frusta Geometry Subjected to Axial Compression

Authors: P. K. Gupta


The present paper deals with the experimental and computational study of axial collapse of the aluminum metallic shells having combined tube-frusta geometry between two parallel plates. Shells were having bottom two third lengths as frusta and remaining top one third lengths as tube. Shells were compressed to recognize their modes of collapse and associated energy absorption capability. An axisymmetric Finite Element computational model of collapse process is presented and analysed, using a non-linear FE code FORGE2. Six noded isoparametric triangular elements were used to discretize the deforming shell. The material of the shells was idealized as rigid visco-plastic. To validate the computational model experimental and computed results of the deformed shapes and their corresponding load-compression and energy-compression curves were compared. With the help of the obtained results progress of the axisymmetric mode of collapse has been presented, analysed and discussed.

Keywords: Axial compression, crashworthiness, energy absorption, FORGE2, metallic shells.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1324


[1] Johnson W and Reid SR. (1978) "Metallic energy dissipating systems." Appl Mech Rev; 31:277-88.
[2] Postlethwaite HE and Mills B. (1970) "Use of collapseible structural elements as impact isolators with special reference to automotive applications." J Strain Anal; 5: 58-73.
[3] Mamalis AG and Johnson W. (1983) "The quasi-static crumpling of thin-walled circular cylinders and frusta under axial compression." Int J Mech Sci; 25: 713-32.
[4] Mamalis AG, Johnson W and Vigilant GL. (1984) "The crumbling of steel thin-walled tubes and frusta under axial compression at elevated strain-rate: some experimental results." Int J Mech Sci;26:537-47.
[5] Mamalis AG, Manolakos DE, Saigal S, Viegelahn G and Johnson W. (1986) "Extensible plastic collapse of thin-wall frusta as energy absorbers." Int J Mech Sci; 28: 219-29.
[6] Mamalis AG, Manolakos DE, Viegelahn GL and Johnson W. (1988) "The modeling of the progressive extensible plastic collapse of thin-wall shells." Int J Mech Sci; 30: 249-61.
[7] Alghamdi AAA. (1991) "Design of simple collapsible energy absorber." MSc thesis. College of engineering, King Abdulaziz University, Jeddah, Saudi Arabia.
[8] Aljawi AAN, Alghamdi AAA.( 1999) "Investigation of axially compressed frusta as impact energy absorbers." In: Gaul L, Brebbia AA, editors. Computational methods in contact mechanics IV. Southampton: WIT Press; p. 431-43.
[9] Aljawi AAN, Alghamdi AAA. (2000) "Inversion of frusta as impact energy absorbers." In: Hassan MF, Megahed SM, editors. Current advances in mechanical design and production VII. New York: Pergamon Press; p. 511-9.
[10] Alghamdi AAA, Aljawi AAN, Abu-Mansour TMN, Mazi RAA. (2000) "Axial crushing of frusta between two parallel plates." In: Zhao XL, Grzebieta RH, editors. Structural failure and plasticity. New York: Pergamon Press;. p. 545-50.
[11] Alghamdi AAA, Aljawi AAN, Abu-Mansour TMN. (2002) "Modes of axial collapse of unconstrained capped frusta." Int J Mech Sci; 44: 1145-61.
[12] El-Sobky H, Singace AA, Petsios M. (2001) "Mode of collapse and energy absorption characteristics of constrained frusta under axial impact loading." Int J Mech Sci; 43: 743-57.
[13] Gupta N. K. and Venkatesh (2007) "Experimental and numerical studies of impact axial compression of thin-walled conical shells" International Journal of Impact Engineering.
[14] Gupta P. K. and Gupta N. K. (2006) "Computational and experimental studies of crushing of metallic hemispherical shells" Archive of Applied Mechanics 76: 511-524
[15] Gupta P. K. and Gupta N. K. (2006) "An experimental and computational study of crushing of metallic hemispherical shells between two rigid flat platens" Journal of Strain Analysis for Engg. Design Vol. 41, No. 6, pp 453-466.
[16] Gupta P.K. (2008) "A study on mode of collapse of varying wall thickness metallic frusta subjected to axial compression" Thin Wall Struct; 36: 169-79.
[17] FORGE2. (1996) Finite element analysis code for metal forming problems version 2.5, cemef, sofia Antipolis, France 1996.