Impact fracture behavior at the material of aluminum foam

Cho, Jae Ung; Hong, Sungwook; Lee, Sang Kyo; Cho, Chongdu

doi:10.1016/j.msea.2012.01.091

Cited by 67 publications

(21 citation statements)

References 17 publications

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“…7. Stresses due to the elapsed times at all cases of [1][2][3][4][5][6] As analysis result, Fig. 8 shows the graph of minimum internal energies due to the elapsed times at all cases of 1-6.…”

Section: Study Model and Methodsmentioning

confidence: 99%

“…Particularly, the fuel efficiency can be improved through weight reduction of the car body, for which new materials such as CFRP, aluminum alloys and magnesium alloys are frequently applied [1][2][3][4][5]. Since such a weight reduction of the car body should be realized with the stability being secured against collision, the car body design should be realized by investigating impact characteristics due to the impact of car body occurring at collision [6][7][8][9]. In general, the weight of car body with aluminum can be decreased by about approximately 30% compared with steel materials for the same rigidity, while the car body with magnesium is capable of having an effect of weight reduction by 60%.…”

Section: Introductionmentioning

confidence: 99%

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Impact Characteristic According to the Structure of Crash Box at the Vehicle

Min

Cho

2017

Archives of Metallurgy and Materials

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The crash box between a bumper and a car body in automobiles can reduce impacts for car bodies with a bumper at a low-speed collision by preventing the shocks. Also, this crash box is the part playing a very important role for the safety of vehicle and the reduction of repair cost, and many studies have been investigated for the performance. In this study, aluminum foam was inserted in an aluminum crash box to analyze the relationships of deformation, stress and internal energy. The compression characteristics are compared with six cases. In addition, the load due to displacement at experiment for a case is verified by modeling with finite elements and performing the structural analysis. As these study results for investigating characteristics of the crash box, it is thought that the effective designs of crash box to enhance the durability for collision are made possible.

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Section: Study Model and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact Characteristic According to the Structure of Crash Box at the Vehicle

Min

Cho

2017

Archives of Metallurgy and Materials

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“…In both the FE models, crushable foam material model was used to describe the mechanical behavior of the foam. In ABAQUS, the crushable foam material model is based on the theory developed by Deshpande and Fleck for isotropic hardening materials [24,25] and has been used in [15,[26][27][28][29][30][31] for modeling the material behavior of foams in ABAQUS package. This material model is also used in [14,[32][33][34] for modeling the mechanical behavior of foams in LS-DYNA FE package.…”

Section: Macro-scale Modelmentioning

confidence: 99%

CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact

et al. 2018

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Abstract:In this study, a new numerical approach based on CT-scan images and finite element (FE) method has been used to predict the mechanical behavior of closed-cell foams under impact loading. Micro-structural FE models based on CT-scan images of foam specimens (elastic-plastic material model with material constants of bulk aluminum) and macro-mechanical FE models (with crushable foam material model with material constants of foams) were constructed. Several experimental tests were also conducted to see which of the two noted (micro-or macro-) mechanical FE models can better predict the deformation and force-displacement curves of foams. Compared to the macro-structural models, the results of the micro-structural models were much closer to the corresponding experimental results. This can be explained by the fact that the micro-structural models are able to take into account the interaction of stress waves with cell walls and the complex pathways the stress waves have to go through, while the macro-structural models do not have such capabilities. Despite their high demand for computational resources, using micro-scale FE models is very beneficial when one needs to understand the failure mechanisms acting in the micro-structure of a foam in order to modify or diminish them.

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“…The performance of sandwich structures with an aluminium foam core and aluminium alloy sheets under low and high-velocity impact loading were analyzed by various experiments and numerical simulations. Various works of literature focused on the typical deformation/failure modes, failure mechanism and energy absorption of the sandwich structures (Cho et al, 2012;Dean et al, 2011;Qiu and Fleck, 2003;Shen et al, 2010b;Shen et al, 2015;Li et al, 2014). In particular, an analytical model developed by Fleck and Deshpande (2004) has become a theoretical frame for studying the dynamic response of sandwich structures.…”

Section: Latin American Journal Of Solids and Structures 12 (2015) 20mentioning

confidence: 99%

A numerical study on the impact behavior of foam-cored cylindrical sandwich shells subjected to normal/oblique impact

Zhou

Zhang

et al. 2015

Lat. Am. j. solids struct.

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Finite element analysis was used to investigate the impact behavior of the foam-cored sandwich shells under the ballistic impact. The ballistic limit, failure mode of the face-sheet and energy absorption of the uniform/graded core were discussed in this paper. Based on the impact phase diagrams, the effects of several factors (i.e. projectile shape and diameter, face-sheet curvature and thickness) on the normal/oblique impact behavior were analyzed in detail. Results indicate that blunter and larger projectiles, higher impact velocity and thicker facesheets can significantly raise the impact-resistance performance of the targets. In addition, the behavior of ballistic impact becomes more complex as the result of the increasing oblique angle. KeywordsCylindrical sandwich shells; aluminium foam; oblique impact; impact phase diagram; numerical simulation.

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Impact fracture behavior at the material of aluminum foam

Cited by 67 publications

References 17 publications

Impact Characteristic According to the Structure of Crash Box at the Vehicle

Impact Characteristic According to the Structure of Crash Box at the Vehicle

CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact

A numerical study on the impact behavior of foam-cored cylindrical sandwich shells subjected to normal/oblique impact

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