Fabrication and characterization of hypoeutectic open-cell Al-Si foams using gravity die casting and squeeze casting

2018 ◽  
Vol 115 (5) ◽  
pp. 509 ◽  
Author(s):  
Samsudin Fitri Aida ◽  
Mirsad Nur Hijrah ◽  
Amirah Ahmad Hamdi ◽  
Hussain Zuhailawati ◽  
Abu Seman Anasyida
Keyword(s):  
Energy Absorption ◽  
Aluminum Foam ◽  
Squeeze Casting ◽  
Die Casting ◽  
Compression Tests ◽  
Open Cell ◽  
Space Holder ◽  
Absorption Energy ◽  
Energy Absorbing

Gravity die casting and squeeze casting are the techniques used for the fabrication of hypoeutectic open-cell Al-Si foams which are characterized and studied for their energy absorbing quality in compression tests. The effect of different amounts of sodium chloride (NaCl) (up to 56 vol.%) as a space holder in the casting of aluminum foam on the morphology, density, porosity, compressive and energy absorption properties of aluminum foam was studied. The hypoeutectic Al-Si alloy with NaCl particles as a space holder was used to fabricate the aluminum foam using gravity die casting and squeeze casting. The hypoeutectic open-cell Al-Si foams produced by squeeze casting showed smaller pore size, better pore distribution, higher porosity, good compressive strength and greater energy absorption energy compared to that of gravity die casting. The hypoeutectic open-cell Al-Si foams with 44 vol.% NaCl using squeeze casting showed the best properties among all foams due to its moderate and well-distributed porosity.

scholarly journals Dynamic Compressive Behaviors of Two-Layer Graded Aluminum Foams under Blast Loading

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1445 ◽  
Author(s):  
Minzu Liang ◽  
Xiangyu Li ◽  
Yuliang Lin ◽  
Kefan Zhang ◽  
Fangyun Lu
Keyword(s):  
Energy Absorption ◽  
Aluminum Foam ◽  
Blast Resistance ◽  
Blast Loading ◽  
Deformation Energy ◽  
Aluminum Foams ◽  
Conflicting Objectives ◽  
Energy Dissipated ◽  
Transmitted Impulse ◽  
Energy Absorbing

Experimental and numerical analyses were carried out to reveal the behaviors of two-layer graded aluminum foam materials for their dynamic compaction under blast loading. Blast experiments were conducted to investigate the deformation and densification wave formation of two-layer graded foams with positive and negative gradients. The shape of the stress waveform changed during the propagation process, and the time of edge rising was extended. Finite element models of two-layer graded aluminum foam were developed using the periodic Voronoi technique. Numerical analysis was performed to simulate deformation, energy absorption, and transmitted impulse of the two-layer graded aluminum foams by the software ABAQUS/Explicit. The deformation patterns were presented to provide insights into the influences of the foam gradient on compaction wave mechanisms. Results showed that the densification wave occurred at the blast end and then gradually propagated to the distal end for the positive gradient; however, compaction waves simultaneously formed in both layers and propagated to the distal end in the same direction for the negative gradient. The energy absorption and impulse transfer were examined to capture the effect of the blast pressure and the material gradient. The greater the foam gradient, the more energy dissipated and the more impulse transmitted. The absorbed energy and transferred impulse are conflicting objectives for the blast resistance capability of aluminum foam materials with different gradient distributions. The results could help in understanding the performance and mechanisms of two-layer graded aluminum foam materials under blast loading and provide a guideline for effective design of energy-absorbing materials and structures.

Preliminary NVH Characterization of Metal Foam-Polymer Interpenetrating Phase Composites

2009 ◽  
Author(s):  
Satish Sharma ◽  
Nassif E. Rayess ◽  
Nihad Dukhan
Keyword(s):  
Mathematical Model ◽  
Thermal Stability ◽  
Hybrid Material ◽  
Aluminum Foam ◽  
Metal Foam ◽  
Dynamic Properties ◽  
Metal Foams ◽  
Thermoplastic Polymer ◽  
Open Cell

The damping and basic dynamic properties of a novel type of multifunctional hybrid material known as Metal Foam-Polymer Composite are investigated. This material is obtained by injection molding a thermoplastic polymer through an open cell Aluminum Foam, in essence creating two contiguous morphologies; an Aluminum Foam interconnected “skeleton” with the open pores filled with a similarly interconnected polymer substructure. This coexistence of both materials allows each to contribute its salient properties (e.g. the plastics contributing surface toughness and the metal foams contributing thermal stability). Basic damping testing results are presented for various Aluminum Foam porosities and pore sizes as well as for three types of polymers. A basic mathematical model of the damping is also presented. The integrity of the interface between the Aluminum Foam and the Polymer is discussed in terms of its effect on the overall material damping.

The Progress in Aluminum Foam Research in China

2012 ◽  
Vol 457-458 ◽  
pp. 253-256 ◽  
Author(s):  
Guang Chun Yao ◽  
Huan Liu ◽  
Bin Na Song
Keyword(s):  
Energy Absorption ◽  
Sound Absorption ◽  
Laboratory Experiments ◽  
Aluminum Foam ◽  
Pore Diameter ◽  
Bending Strength ◽  
Steel Plate ◽  
Absorption Energy ◽  
Al Foam ◽  
Impact Bending

The aluminum foam materials have studied for the last 15 years in China, from laboratory experiments to industrialized scale. we can manufacture 800mm×2000mm aluminum foam board products. The essential parameters of our aluminum foam product are as follows, density: 0.3~0.6g/cm3; porosity: 77%~88%; pore diameter 5MPa. Some properties of aluminium foam materials were studied such as sound absorption, energy absorption, impact bending strength of aluminum (steel) plate/Al foam sandwich, etc.

Impact Energy Absorbing System for Space Lander Using Hemispherical Open-Cell Porous Aluminum

2018 ◽  
Vol 933 ◽  
pp. 337-341 ◽  
Author(s):  
Koichi Kitazono ◽  
Raita Tada ◽  
Yoshikazu Sugiyama ◽  
Toko Miura
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Impact Energy ◽  
Melting Process ◽  
Compression Tests ◽  
Laser Melting ◽  
Open Cell ◽  
Porous Aluminum ◽  
Suitable Heat Treatment ◽  
Energy Absorbing

Impact energy absorbing system for space lander is an important technology for space exploring missions. Open-cell porous aluminum manufactured through 3D selective laser melting process has been used on the energy absorbing system. Compression tests for cylindrical and hemispherical shaped porous aluminum with different porosities revealed the high potential as an energy absorbing component. It was found that the suitable heat treatment were effective to increase the energy absorbing potential of the porous aluminum.

Characterization of Polyethylene Foams under Compressive Impact Loading

2005 ◽  
Vol 480-481 ◽  
pp. 513-518 ◽  
Author(s):  
J.L. Ruiz-Herrero ◽  
Miguel A. Rodríguez-Pérez ◽  
Jose A. de Saja
Keyword(s):  
Energy Absorption ◽  
Impact Loading ◽  
Energy Impact ◽  
Optimum Energy ◽  
Rapid Loading ◽  
Protected Object ◽  
Absorbing Material ◽  
Energy Absorbing ◽  
The Impact

It has long been recognized that the mechanical behaviour of materials under conditions of rapid loading and impact differs significantly from that under static load application [1].These differences are specially important for those materials as polymeric foams used as low energy impact absorbing materials[2]. An optimum energy absorbing material needs to dissipate the kinetic energy of the impact while keeping the force on it below some limit, thus resulting in a no-dangerous deceleration of the protected object[3]. The mechanical properties at room temperature of six polyethylene foams with closed cells and different densities have been evaluated in purely compressive impact loading conditions. The energy absorption characteristics have been evaluated through different parameters as the peak of deceleration, the load transmitted, the maximum strain and the impact time. The peak of deceleration is used to obtain the cushion diagrams at five different heights, useful to design energy absorption structures.

Dissolution Method of Aluminum Foams Containing Mg Using Carbamide Space Holder

2017 ◽  
Vol 888 ◽  
pp. 373-376
Author(s):  
Amirah Ahmad Hamdi ◽  
Nurul Akmal Mohd Sharif ◽  
Anasyida Abu Seman
Keyword(s):  
Energy Absorption ◽  
Aluminum Foam ◽  
Aluminium Foam ◽  
Aluminum Foams ◽  
Dissolution Method ◽  
Space Holder

This study investigated the properties of aluminium foam containing Mg with various amount of space holder. Aluminum foam was fabricated using dissolution method with various amount of carbamide (20, 40 and 60 wt. %). Aluminum foam with 60 wt. % carbamide has the lowest density (0.68 g/cm3) and exhibited the highest porosity (74.97%). However, the results indicates that aluminum foam with 40 wt. % of carbamide have good compressive and energy absorption with acceptable density and porosity value.

A Theoretical and Experimental Study on the Dynamic Constitutive Model of Aluminum Foams

2010 ◽  
Vol 638-642 ◽  
pp. 1878-1883
Author(s):  
Ji Lin Yu ◽  
Er Heng Wang ◽  
Liu Wei Guo
Keyword(s):  
Experimental Study ◽  
Material Parameter ◽  
Aluminum Foam ◽  
Extended Model ◽  
Strain Rates ◽  
Compression Tests ◽  
Dynamic Tests ◽  
Aluminum Foams ◽  
Open Cell ◽  
Dynamic Experiments

The phenomenological constitutive framework for compressible elasto-plastic solids presented by Chen and Lu [1] is extended to the dynamic cases by assuming that the material parameter curves in the stress potential depend also on the strain rate. To check the applicability of the extended model, three types of dynamic experiments, i.e., uniaxial compression, lateral-constrained compression and side-constrained compression tests, are conducted for an open-cell aluminum foam at different strain rates. The first two types of dynamic tests are used as characteristic tests to determine the material parameter curves at different strain rates which are then used to construct the stress potential function in the model. The results show that the stress-strain curves under side-constrained compression predicted by the model are in agreement with those obtained experimentally.

scholarly journals An Experimental Study on Boron Carbide Reinforced Open Cell Aluminum Foams Produced via Infiltration Technique

2018 ◽  
Vol 8 (6) ◽  
pp. 3640-3645
Author(s):  
T. Sunar ◽  
M. Cetin
Keyword(s):  
Energy Absorption ◽  
New Technologies ◽  
Weight Ratio ◽  
High Energy ◽  
Cellular Materials ◽  
Absorption Capacity ◽  
Compression Tests ◽  
Aluminum Foams ◽  
Space Holder ◽  
B4c Particles

Light structures and parts are very effective for new engineering applications. Their considerably low densities, high energy absorption capabilities, and desirable mechanical properties make them useful for particularly automotive, defense and aerospace industries. Besides these positive properties, it is known that the production and processing of cellular materials is very tough and worth the effort. Recently, with advances in new technologies like 3D printing or selective laser melting, now different types of cellular materials can be produced. But manufacturing of metallic foams via casting especially replication or infiltration method is fairly an economic method when compared with other methods. In this study, vacuum-gas infiltration set-up was used to produce B4C reinforced aluminum foams. The mentioned method involves the addition of space holder materials and a dissolution technique to remove them after solidification of the metal. As space holder materials NaCl particles were selected and mixed with B4C powders to produce B4C reinforced A360 aluminum foam. By changing the weight ratio of B4C particles, the alteration of properties like porosity, compression strength, and energy absorption capacity was investigated. Additionally, computer tomography views were obtained to see and interpret the microstructures of the foams. Compression tests were carried out to evaluate the mechanical behavior of the foams under static loading. The porosities of samples obtained as between 65-75%. The compressive strength increased with rising relative density.

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