Notice of Retraction Numerical and experimental studies of crash characteristics of an extruded alumnium alloy sections
17 Jun 2010-Vol. 5
TL;DR: In this article, the crash characteristics of an extruded aluminum tube were evaluated by conducting compressive tests at the different rate of deformation and the results were numerically simulated, which indicated that the simulation results and theoretical predictions correlated well with the results of the compressive test.
Abstract: The crash characteristics of an extruded aluminum tube was evaluated by conducting compressive tests at the different rate of deformation and the results were numerically simulated. The numerical results obtained using finite element method were compared with compressive test results and theoretical studies. The test data was analyzed for mode of deformation, peak force and energy absorption characteristics. The results indicated that the simulation results and theoretical predictions correlated well with the results of the compressive test.
References
More filters
994 citations
TL;DR: In this paper, a series of over 120 axial crushing tests were conducted on circular and square steel tubes loaded either statically or dynamically, and approximate theoretical predictions for static and dynamic progressive buckling were developed.
Abstract: A series of over 120 axial crushing tests were conducted on circular and square steel tubes loaded either statically or dynamically. Approximate theoretical predictions for static and dynamic progressive buckling are developed. Fair agreement with the experimental results is achieved provided the effective crushing distance is taken into account and the infuence of material strain rate sensitivity is retained for dynamic loads.
800 citations
TL;DR: In this paper, the axial progressive crushing of square box columns using a kinematically admissible method of analysis was investigated and four deformation modes which govern the behaviour for different ranges of the parameter c/h.
Abstract: Eighty-four dynamic tests on thin-walled square steel tubes having two different cross-sections with c/h = 30.25 and c/h = 32.18 and various lengths were crushed axially on a drop hammer rig. Approximate theoretical predictions were developed for the axial progressive crushing of square box columns using a kinematically admissible method of analysis. This theoretical study predicts four deformation modes which govern the behaviour for different ranges of the parameter c/h. New asymmetric deformation modes were predicted theoretically and confirmed in the experimental tests. These asymmetric modes cause an inclination of a column which could lead to collapse in the sense of Euler even for relatively short columns. The effective crushing distance is considered in the approximate theoretical analysis together with the influence of material strain rate sensitivity, which is important for steel even when the loadings are quasi-static. The simple equations presented herein for the design of axially crushed spuare box columns give reasonable agreement with the corresponding experimental results.
710 citations
"Notice of Retraction Numerical and ..." refers background in this paper
...Aluminum has good corrosion resistance and can be recycled with an energy input equal to 5% of the energy needed to produce primary aluminum[1-6]....
[...]
TL;DR: In this paper, the energy absorption performance of extruded aluminum tubing for space frames was evaluated using computer-simulated compressive tests and quasi-static compressive deformation tests.
Abstract: The energy absorption performance of extruded aluminum tubing for space frames was evaluated using computer-simulated compressive tests and quasi-static compressive deformation tests. An experimental deformation test and its simulation were conducted for seven extruded tube specimens on which various types of triggering dents were introduced, and the test data were investigated via observation of deformation mode, maximum repulsive force, and absorbed energy. The results indicated that the computer simulation results correlated well with the compressive deformation mode, indicating that the simulation was useful for the evaluation of absorbed energy. When triggering dents were introduced at the folding sites pre-estimated by the computer simulation, energy absorption could be improved, and the half-dented specimens absorbed more effectively than the full-dented specimens. On the other hand, when triggering dents of the same interval were introduced without consideration of the peak location of the folding wave, inhomogeneous deformation, together with overall bending, occurred, and deteriorated energy absorption because energies in bending were not as effectively absorbed as on folding.
123 citations
TL;DR: In this article, the mean crushing strength of L and cruciform shapes was analyzed. And the importance of extensional deformation to the energy absorption process, representing at least one third of the dissipated energy was shown.
Abstract: Attenuation of the load transmitted to a vehicle occupant by the structure, either by modifying structural assembly, changing geometry of its elements, or adding specific load limiting devices to help dissipate kinetic energy was studied. General aviation aircraft have fuselage subfloors of a built up structure which are generally very stiff perpendicular to the floor of the cabin. The subfloor structure, designed to crush at an appropriate force level, can be used to advantage in a crash by dissipating energy through plastic buckling of the floor beams and frames. Simple closed form solutions to predict the mean crushing force levels of subfloor designs is useful in engineering practice. The crushing process of thin walled, plate formed, open structures with particular emphasis on L and cruciform shapes was analyzed. Lower and upper bound solutions for the mean crushing strength of cruciforms are obtained by considering modes of deformation which account for both bending and extensional deformation. It is the importance of extensional deformation to the energy absorption process, representing at least one third of the dissipated energy is shown. Previously announced in STAR as N82-33765
90 citations
"Notice of Retraction Numerical and ..." refers background in this paper
...Aluminum has good corrosion resistance and can be recycled with an energy input equal to 5% of the energy needed to produce primary aluminum[1-6]....
[...]