Collapse analysis of Al 6061 alloy conical shells with circular cutouts under axial loading: experiment and simulation

2022 ◽  
pp. 146442072110546
Author(s):  
Hamid Hasanzadeh ◽  
Ehsan Mohtarami ◽  
Mohammad Ebadati ◽  
Kazem Reza Kashyzadeh ◽  
Mostafa Omidi Bidgoli
Keyword(s):  
Energy Absorption ◽  
Failure Modes ◽  
Numerical Study ◽  
Axial Loading ◽  
Maximum Force ◽  
Asymmetric Mode ◽  
Buckling Modes ◽  
Conical Shells ◽  
Crushing Behavior ◽  
Force Displacement

The current research is conducted to investigate the experimental and numerical study of crushing behavior and buckling modes of thin-walled truncated conical shells with or without cutouts and discontinuities under axial loading. In this regard, Instron 8802 servohydraulic machine is used to perform the experiments. Additionally, the buckling modes, derived from the axial collapse phenomenon, are simulated with Finite Element (FE) software. The force-displacement diagrams extracted numerically are compared with experimental results. Various factors, including maximum force, energy absorption, specific energy, and failure modes of each case, are also discussed. The results indicate that the increasing cutout cause a decrease in the maximum force and energy absorption. Moreover, with cutouts reduction, the failure modes of the samples changed from the diamond asymmetric mode and single-lobe mode to multi-lobes, and with removing cutouts, the failure mode is observed to be completely symmetric.

Crush Response of Polyurethane Foam-Filled Aluminium Tube Subjected to Axial Loading

2014 ◽  
Vol 875-877 ◽  
pp. 534-541 ◽  
Author(s):  
Chawalit Thinvongpituk ◽  
Nirut Onsalung
Keyword(s):  
Energy Absorption ◽  
Polyurethane Foam ◽  
Testing Machine ◽  
Axial Loading ◽  
Asymmetric Mode ◽  
Pu Foam ◽  
Universal Testing ◽  
Collapse Mode ◽  
Empty Tube ◽  
Foam Filled

In this paper, the experimental investigation of polyurethane (PU) foam-filled into circular aluminum tubes subjected to axial crushing was presented. The purpose of this study is to improve the energy absorption of aluminium tube under axial quasi-static load. The aluminium tube was made from the AA6063-T5 aluminium alloy tubes. Each tube was filled with polyurethane foam. The density of foam was varied from 100, 150 and 200 kg/mP3P including with empty tube. The range of diameter/thickness (D/t) ratio of tube was varied from 15-55. The specimen were tested by quasi-static axial load with crush speed of 50 mm/min using the 2,000 kN universal testing machine. The load-displacement curves while testing were recorded for calculation. The mode of collapse of each specimen was analyzed concerning on foam density and the influence of D/t ratio. The results revealed that the tube with foam-filled provided significantly increment of the energy absorption than that of the empty tube. While the density of foam and D/t ratios increase, the tendency of collapse mode is transformed from asymmetric mode to concertina mode.

Crushing behavior and energy absorption performance of a bio-inspired metallic structure: Experimental and numerical study

2018 ◽  
Vol 131 ◽  
pp. 547-555 ◽  
Author(s):  
Alper Tasdemirci ◽  
Emine Fulya Akbulut ◽  
Erkan Guzel ◽  
Firat Tuzgel ◽  
Atacan Yucesoy ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Numerical Study ◽  
Metallic Structure ◽  
Absorption Performance ◽  
Crushing Behavior

Evaluation of Crushing Response of Limited Bonding of a Composite Core With a Cross Tube

2020 ◽  
Author(s):  
Sean Jenson ◽  
Muhammad Ali ◽  
Khairul Alam
Keyword(s):  
Energy Absorption ◽  
Axial Loading ◽  
Absorption Capacity ◽  
Displacement Curve ◽  
Progressive Deformation ◽  
Finite Element Software ◽  
First Case ◽  
Short Period ◽  
Deformation Modes ◽  
Force Displacement

Abstract Rectangular and round tubular structures are typically used in a vehicles’ front structure to increase the energy absorption capacity in the event of an accident. There is significant interest in lighter structures for improving automobiles’ fuel efficiency with the challenge of maintaining or preferably exceeding the energy absorption properties of the structure. The structural members are designed to take on the challenge of absorbing maximum amount of energy in a relatively short period of time, while also maintaining reactive forces below damaging levels as they undergo progressive deformation under axial loading. The type of deformation mode is critical as it defines the overall configuration of force-displacement curve. There are different types of deformation modes for cross tube under axial loading. Likewise, cellular structures exhibit distinct deformation modes under in-plane loading. The work presented here investigates the effects of bonding of composite cellular core structure on deformation modes of cross tubes under axial loading. The numerical simulations were performed in ABAQUS finite element software. Four cases were considered for analysis. The first case did not contain core bonding. The second case consisted of 3 bonding sites. In the third case, 5 bonding zones were defined and in the final case, 7 bonding sites were assigned. Bonding of the composite core resulted in an increase of up to 39.2% energy absorption as compared to the unbonded case. The results show discrete bonding of composite cellular core with the tube has significant effect on progressive deformation of tubes and therefore, presents an opportunity to re-configure force-displacement curve for improved protection of automobile structures under impact loading.

scholarly journals Experimental and numerical study of the crushing behavior of pultruded composite tube structure

2020 ◽  
Vol 40 (7) ◽  
pp. 615-627
Author(s):  
Mohd Kamal Mohd Shah ◽  
Yeo Kiam Beng ◽  
Sanjay Mohan ◽  
Mohd Nizam Husen ◽  
Irma Othman ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Cross Section ◽  
Composite Structures ◽  
Numerical Study ◽  
Peak Load ◽  
Absorption Capacity ◽  
Impact Loads ◽  
Energy Absorption Capacity ◽  
Crushing Behavior ◽  
Pultruded Composites

AbstractPultrusion is considered to be a cost efficient method for developing composite structures. It facilitates the fabrication of uniform cross-section products with improved fiber alignment, mechanical properties, good surface characteristics, etc. In order to ascertain the crashworthiness, the pultruded composites shall be able to resist impact loads, and in this concern, the energy absorption capacity of the pultruded composites must be explored. This article presents the experimental and numerical investigation of the crushing behavior of polyester based pultruded composite with rectangular cross section. Pultruded rectangular tubes with e-glass/polyester composites have been developed for this study. The cross-section of the tubes was developed into two triggering profiles, the uniform edge around the section and the tulip pattern. The tubes were subjected to impact loads, and the effect of these triggering profiles on the energy absorption capacity of the tubes has been investigated. The testing of all composites has been carried out at three different impact velocities (10, 20 and 45 mm/min). The results have revealed the dependence of crushing behavior of the tubes on the loading velocity and the triggered profiles. Lower peak load and high specific energy absorption (SEA) was observed in the tube with tulip pattern profile. The results obtained from the simulation have also shown consistency with the real-time experiments.

Numerical Study of the Effects of Strain Rate and Cell Geometry on Dynamic Behavior of Axial Crushing Honeycomb

2016 ◽  
Vol 725 ◽  
pp. 156-161
Author(s):  
Tsutomu Umeda ◽  
Kohei Kataoka ◽  
Koji Mimura
Keyword(s):  
Strain Rate ◽  
Energy Absorption ◽  
Numerical Study ◽  
Absorption Capacity ◽  
Metal Foil ◽  
Energy Absorption Capacity ◽  
Axial Crushing ◽  
Geometric Conditions ◽  
Crushing Behavior ◽  
Adhesively Bonded Joint

The axial crushing behavior of commercial metal honeycombs was studied with laying emphasis on the effects of strain rate and geometry on its characteristics as an energy absorber. To investigate the effect of strain rate on the energy absorption capacity, the honeycombs of some metal foil materials were numerically modeled by taking the plastic deformation and failure of adhesively-bonded joint between corrugated sheets and the initial imperfection into consideration. The relationship between the enhancement of mean buckling stress and the strain rate was discussed. Furthermore, A3003 honeycomb model was examined by changing its branch angle from 30° to 180° because the geometrical dispersion will also affect the energy absorption capacity. Typical calculated results under different strain rate and geometric conditions were compared with the corresponding experimental results. It was found that the effect of strain rate on the stress – strain relation of the honeycomb structure is greatly relaxed as compared with that of the material itself. The effects of the boundary condition on the crushing behavior of irregular honeycombs were also discussed.

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