External inversion of thin-walled tubes using a die: experimental and theoretical investigation

Theoretical model of a metal tube under inversion over circular dies

“…The successful inversion of a tube mainly depends on its material properties [10], the friction coefficient between tube and die [6,7], and the dimension of the die [11][12][13][14]. In general, a tube made of the ductile material over a die with low friction coefficient is easier to be inverted.…”

Design and Modeling Studies of Tube End Expansion using Response Surface Methodology

“…Rosa et al [1][2] conducted the experimental and theoretical investigations on the external and internal inversions of thin-walled tubes. They understood the modes of deformation during the free curved internal and external inversion of tubes.…”

A New Configuration of Circular Stepped Tubes Reinforced with External Stiffeners to Improve Energy Absorption Characteristics Under Axial Impact

“…The crush takes place progressively, and consequently the energy can be dissipated with high energy absorption, long stroke and crushing stability along a large plastic deformation process (Reid, 1993) . The thinwalled circular tubes under axial impact loading could absorb the energy with different mechanisms such as splitting (Niknejad et al, 2013), extrusion (Galib et al, 2006), expansion (Salehghaffari et al, 2010), trigger (Huang and Wang, 2010), inversion (Guist and Marble, 1966;Rosa et al, 2003;Luo et al, 2007;Gupta, 2014;andQiu et al, 2014), stiffeners (lateral or longitudinal ) (Zhang and Suzuki, 2007), metal cutting (Jin and Altenhof, 2011). During the progressive crushing under axial compression, different types of deformation modes such as an axisymmetric (concertina) mode, nonsymmetric (diamond) mode, mixed mode or global Euler buckling mode, could happen depending on the geometric parameters of the tube (length, diameter and thickness),material properties and boundary conditions (Andrews et al, 1983;Abramowicz and Jones, 1984).…”