Transition from progressive to global buckling of aluminium extrusions – a numerical study

Jensen, Østen; Hopperstad, Odd Sture; Langseth, Magnus

doi:10.1533/ijcr.2005.0373

Cited by 22 publications

(26 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar observations were reported by Abramowicz and Jones [5] who studied the response of long circular and square mild steel tubes and by Jensen et al [7] for dynamically loaded square aluminium alloy extrusions. The experimental [5,8] and numerical [7,9,10] results for circular and square tubes, subjected to axial impacts with initial velocities up to 20 m/s, show that the critical length for the buckling transition has a tendency to increase when increasing the impact velocity, although, for some loading parameters, a counter-intuitive response is observed and no critical buckling length can be defined.…”

Section: Introductionsupporting

confidence: 86%

“…Such slender structures can exhibit additional buckling modes leading to poor energy absorption. In particular, buckling modes similar to the Euler buckling mode characteristic for statically loaded columns or higher dynamic buckling modes can develop in long tubes (global bending) as shown experimentally by Andrews et al [4], Abramowicz and Jones [5] and other authors [6][7][8]. The particular mode of collapse depends on the geometry, boundary conditions and material of the structure.…”

Section: Introductionmentioning

confidence: 92%

“…The particular mode of collapse depends on the geometry, boundary conditions and material of the structure. Recently, extensive numerical work has provided some insight into the dynamic buckling transition from global bending collapse to progressive buckling [7,9,10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the mechanics of the global bending collapse of circular tubes under dynamic axial load—Dynamic buckling transition

Karagiozova¹,

Jones²

2008

International Journal of Impact Engineering

View full text Add to dashboard Cite

The common features of the deformation of long circular tubes made from different aluminium alloys and subjected to various axial impact loadings are established and used to develop simplified structural models for global bending collapse and progressive buckling. A two-phase deformation model for axially loaded structural elements is proposed, which retains the characteristic features of the initial compression and subsequent bending/buckling phases. It is shown that the velocity histories in the two principal collapse modes of long tubes play an important role for the formation of the particular deformation pattern. The simplified structural models are verified with some numerical finite-element results and their behaviour is shown to be adequate.A parametric analysis of the models is further performed in order to divulge the major factors, which influence the dynamic buckling transition. The analysis reveals that there is a specific impact velocity associated with the particular geometric and material properties of a circular tube, which causes a counter-intuitive response. An empirical criterion for the lower and upper bounds to the critical impact velocity for a buckling transition is proposed. Further, the upper bound to the impact velocity is used to formulate a criterion for the dynamic buckling transition.

show abstract

Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

On the mechanics of the global bending collapse of circular tubes under dynamic axial load—Dynamic buckling transition

Karagiozova¹,

Jones²

2008

International Journal of Impact Engineering

View full text Add to dashboard Cite

show abstract

“…7. Geometry currently used in crash experiment: (a) top hat specimen and (b) hexagonal specimen [37]. different simulations with more dense mesh that the results were the same.…”

Section: Experimental and Numerical Procedures Used To Characterize A mentioning

confidence: 99%

“…22(a), or showing negative strain-rate sensitivity like some kinds of aluminum alloys [35,36], the collapse will appear on the opposite side of impact and may induce bending of the structure especially for long structure [15,33,37]. In this case the desired high capacity of energy absorption of a structure to protect the passengers will be lost.…”

Section: Thermo-visco-plastic Behavior With Johnson-cook Model and LImentioning

confidence: 99%

Effect of plastic deformation and boundary conditions combined with elastic wave propagation on the collapse site of a crash box

Rusinek

Zaera

Forquin

et al. 2008

Thin-Walled Structures

View full text Add to dashboard Cite

Several papers have been published recently on the crashworthiness studies. The main task was to predict the energy absorption W p and average collapse forceF in time of sheet steel structures. The main objective of this contribution is to design a component that allows absorbing and dissipating a high energy W p allowing improvements of the survivability of passengers in vehicles. However, the range of applications is larger since it includes all civil and military applications related to safety of components, or more generally of construction elements being loaded by impacts or explosions. In the present 3D case, the aim of this numerical study on dynamic loading in adiabatic conditions of deformation is to analyze the effect of elastic wave propagation combined with plastic behavior on the collapse site of a rectangular tubular structure made of steel sheet. To demonstrate the strong coupling between the effects of strain rate sensitivity, accounted for in the constitutive relation that is used in numerical simulations, with the process of elastic wave reflection on the boundary conditions, a series of numerical simulation was performed. It is shown in this numerical study that the strain rate sensitivity influences the position of the first collapse site. Moreover, the first collapse initiation of a structure defines the level of power absorption. Since the process of folding may be combined with bending of the structure (in particular when a local buckling appears close to the opposite side of impact), in this non axial case the energy absorption W p decreases and the effectiveness of the structure to the energy absorption is insufficient.

show abstract

Crush behaviour of foam-filled thin-walled conical frusta: analytical, numerical and experimental studies

2016

View full text Add to dashboard Cite

Transition from progressive to global buckling of aluminium extrusions – a numerical study

Cited by 22 publications

References 9 publications

On the mechanics of the global bending collapse of circular tubes under dynamic axial load—Dynamic buckling transition

On the mechanics of the global bending collapse of circular tubes under dynamic axial load—Dynamic buckling transition

Effect of plastic deformation and boundary conditions combined with elastic wave propagation on the collapse site of a crash box

Crush behaviour of foam-filled thin-walled conical frusta: analytical, numerical and experimental studies

Contact Info

Product

Resources

About