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Quasistatic deformation analysis of melt‑based molded die‑cast open‑cell aluminum alloy foam

Raza Mohammad Shahid, Datta Susmita, Saha Partha

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e24, 2023

EN

The metal foams behavior significantly depends on the method applied for its manufacturing. Present work investigates the mechanical quasistatic three-point and compressive deformation behavior of molded die-cast open-cell Aluminum Alloy foam (OCAF). Different span lengths and loading velocities were selected for the experimentation. The deformation behavior of the OCAF was studied and the effect was correlated with different theories available for foam deformation. The plastic behavior of OCAF was also studied using a compression loading-unloading experiment at different stress and strain values. Microstructural study and phase analysis were carried out at the cell wall surfaces using fractography to establish the cause of brittle failure dominant in the foam. Further, micro-CT analysis was used to study the cell deformation in the bulk material and the role of micropores and macro-pores.

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Neural Networks in Crashworthiness Analysis of Thin-Walled Profile with Foam Filling

Rogala Michał

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 3

93--99

EN

This article presents the numerical tests of thin-walled compressed columns with a square cross-section. The crush efficiency indicators were determined using the finite element method (Abaqus) and neural networks of MLP. The models had a constant circular trigger, with a diameter of 32 mm. During dynamic analysis, the samples were loaded with 1700 J. The numerical models were filled with aluminum foam from 40 mm to 180 mm every 20 mm. The study presents the conclusions for the thin-walled models with crushable foam.

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Trends of joining composite AlSi-SiC foams

Nowacki J., Sajek Adam

Advances in Materials Science

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2019

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Vol. 19, nr 1(59)

70--82

EN

The paper consist of characterization of the essence of structure, properties and application of AlSi-SiC composite foams as well as limitations and possibilities of their joining. Porous structure with porosity up to 80% and exceptional properties of aluminium foams are the reason of their numerous application and interest of their joining. Consideration of methods of welding, soldering and gluing AlSi9-SiC10 composite foams, the joint structure, and properties. Recommendations for surface preparation of foam, and different joining procedures aimed at control the porosity of the foam and glued surface roughness were established. Result of EDS and XRD investigations of the AlSi9-SiC10 composite foams joint were considered.

4

Comparative analysis of buckling load of circular and corrugated tubes by utilizing key performance indicators

Rahim M. R., Akhtar S., Bharti P. K.

International Journal of Applied Mechanics and Engineering

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2017

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Vol. 22, no. 3

789--797

EN

The performance of buckling load of tubular structures under quasi-static axial loading is quite appreciable, numerous tubes of various cross-section have been extensively investigated and corrugated sections have been designed to further improve the performance. In this paper, a carefully designed set of key performance indicators (KPIs) is utilized to assess and compare the buckling load of circular and corrugated tubes. A series of diagrams related to KPIs with various parameters of tubes are presented to demonstrate the influence of sectional configuration on the performance of tubes as well as the effect of the material on the potential of the same. The work is inestimable to engineering designs and applications, and further studies on the buckling load of other configurations.

5

Optimizing glue joint of aluminium metallic foams

Nowacki J., Sajek A.

Journal of Achievements in Materials and Manufacturing Engineering

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2016

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Vol. 75, nr 1

14--23

EN

Purpose: Characteristics of aluminium foams as construction material were given, along with some exemplary applications. The purposefulness of lowering the mass of constructions comprising aluminium foams was discussed, and bonding techniques as well as prospects of reducing the mass of a joint were analysed. A computer simulation was performed for a representative fragment of a glue joint in aluminium foam with the purpose of analyzing existing stresses for three variants of thickness of a layer of epoxy glue. Design/methodology/approach: Preliminary tests on the complete test specimen were conducted, and then a new model of a joint was made, based on a small part of the geometry of the joint. The methodology employed allowed for a precise investigation of the working conditions of a glue joint in a statics hear test depending on the thickness of a layer of glue. Findings: A high interdependence between stresses in a metallic foam and the thickness of a glue joint was observed – the thicker the layer of glue, the stiffer the joint. The thickness of the glue layer inspected in the simulation does not influence the strength of the joint. Research limitations/implications: The tests were conducted with the use of an improved yet simplified model of a joint that allowed to determine stresses present both in metallic foam and in the weld. Further course of action in the modelling of glue joints was set with the aim of establishing a more detailed definition of weld work conditions. Practical implications: Basic factors affecting the efficiency of joining aluminium foams by means of gluing were defined, and guidelines concerning the technology for producing a proper joint were given. Originality/value: A problem concerning gluing aluminium foams with regard to mass optimization was highlighted. A mechanism for minimizing stresses in the structure of a weld through the regulation of weld thickness was presented.