scholarly journals Preparation of Cast Metallic Foams with Irregular and Regular Inner Structure

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6989
Author(s):  
Ivana Kroupová ◽  
Martina Gawronová ◽  
Petr Lichý ◽  
Václav Merta ◽  
Filip Radkovský ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Main Idea ◽  
Physical And Mechanical Properties ◽  
Metallic Foam ◽  
Metallic Foams ◽  
Manufacturing Companies ◽  
Main Motivation ◽  
Internal Cavities ◽  
Production Technologies ◽  
Foam Production

The aim of this paper is to summarize the possibilities of foundry methods for the production of metallic foams. At present, there are a number of production technologies for this interesting material, to which increasing attention has been paid in recent years. What is unique about metallic foams is the combination of their physical and mechanical properties. As part of our research, we designed and verified four main methods of metallic foam production by the foundry technology, whose products are metallic foam castings with regular and irregular arrangements of internal cavities. All these methods use materials and processes commonly used in conventional foundry technologies. The main idea of the research is to highlight such technologies for the production of metallic foams that could be provided by manufacturing companies without the need to introduce changes in production. Moreover, foundry methods for the production of metallic foams have the unique advantage of being able to produce even complex shaped parts and can thus be competitive compared to today's established technologies, the output of which is usually only a semi-finished product for further processing. This fact was the main motivation for the research.

Modeling of the Behavior of an Aluminum Metallic Foam by Both FEM and Experimental Results

2013 ◽  
Vol 773-774 ◽  
pp. 478-487
Author(s):  
Juan Pablo Fuertes ◽  
Rodrigo Luri ◽  
Javier León ◽  
Daniel Salcedo ◽  
Ignacio Puertas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flow Stress ◽  
Material Flow ◽  
Aluminum Foam ◽  
Research Work ◽  
Physical And Mechanical Properties ◽  
Metallic Foam ◽  
Low Density ◽  
Metallic Materials ◽  
Aluminum Foams

Aluminum foams are porous metallic materials which possess an outstanding combination of physical and mechanical properties such as: a high rigidity with a very low density. In this present research work, a study on the upsetting of an aluminum foam (with a density = 0.73 g/cm3) is carried out by employing different compression velocity values. From the results obtained, it is possible to determine the material flow stress for its subsequent use in finite element simulations (FEM). Once the material flow stress has been determined, it will be employed in order to analyze the conformability of several parts by FEM.

Characterization of mechanical properties of metallic foams by instrumented indentation test

2018 ◽  
Vol 115 (4) ◽  
pp. 405
Author(s):  
Ali Nayebi ◽  
Azam Surmiri
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Constitutive Model ◽  
Indentation Test ◽  
Metallic Foam ◽  
Spherical Indentation ◽  
Metallic Foams ◽  
Aluminum Foams ◽  
Inelastic Behaviour ◽  
Indentation Response

In this study, the spherical indentation tests with a spherical rigid indenter of 5 mm radius were used. The inelastic behaviour of metallic foam was considered as an isotropic crushable foam constitutive model of Deshpande and Fleck which has been shown experimentally that their model can be applied to aluminum foams. The spherical indentation test was modeled by finite element method. A 2D axisymmetric model was developed. Practically, the size of the indenter tip should be reasonably large compared to the size of the cells/pores in the specimen and the indentation depth should also be reasonably large so that the indentation response does reflect the averaged material behaviours, which are described by the aforementioned constitutive model. The applied load on the indenter versus its displacement was obtained under different metallic foam mechanical properties. Numerical results from the finite element simulations are used to obtain the dependence of the indentation response on the metallic foam material parameters which characterizes the plastic deformation of metallic foams. Finally, the stress–curves and the elastic modulus of different foams are obtained by the indentation curve, which is obtained by FEM.

Recycling of Waste Epoxy-Polyester Powders for Foam Production

2011 ◽  
Vol 1 (3) ◽  
pp. 10-20 ◽  
Author(s):  
Carmine Lucignano ◽  
Erica Anna Squeo ◽  
Alessandro Guglielmotti ◽  
Fabrizio Quadrini
Keyword(s):  
Mechanical Properties ◽  
Filler Content ◽  
Physical And Mechanical Properties ◽  
Industrial Applications ◽  
Compression Tests ◽  
Cold Compaction ◽  
Composite Foams ◽  
Domestic Appliances ◽  
Foam Production ◽  
Foaming Technology

This paper proposes a new foaming technology (solid-state foaming) to produce structural foams from waste thermosetting resins. The proposed technology is easy and does not require specific and expensive equipments. Solid tablets are produced by cold compaction of resin powder, and foam by heating in an oven. Composite foams can be produced by mixing fillers and resin powder before the cold compaction. In the experiment, an epoxy-polyester (EP-PE) resin powder, deriving from the waste of a manufacturer of domestic appliances, was used with montmorillonite (MMT) particles. Resulting foams with a filler content ranging from 0 to 10 wt% were characterized in terms of physical and mechanical properties (by compression tests). Although the effect of the MMT content seems to be negative for the adopted resin, the feasibility of producing composite foams by recycling waste industrial powders is shown. The properties of the unfilled foams are sufficient for many industrial applications.

scholarly journals Casting Routes for Porous Metals Production

2012 ◽  
Vol 12 (1) ◽  
pp. 71-74 ◽  
Author(s):  
P. Lichy ◽  
V. Bednarova ◽  
T. Elbel
Keyword(s):  
Mechanical Properties ◽  
Specific Surface ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
Metal Foams ◽  
Process Conditions ◽  
Metallic Foams ◽  
Porous Metals ◽  
New Type ◽  
Metals Production

Casting Routes for Porous Metals Production The last decade has seen growing interest in professional public about applications of porous metallic materials. Porous metals represent a new type of materials with low densities, large specific surface, and novel physical and mechanical properties, characterized by low density and large specific surface. They are very suitable for specific applications due to good combination of physical and mechanical properties such as high specific strength and high energy absorption capability. Since the discovery of metal foams have been developed many methods and techniques of production in liquid, solid and gas phases. Condition for the use of metal foams - advanced materials with unique usability features, are inexpensive ways to manage their production. Mastering of production of metallic foams with defined structure and properties using gravity casting into sand or metallic foundry moulds will contribute to an expansion of the assortment produced in foundries by completely new type of material, which has unique service properties thanks to its structure, and which fulfils the current demanding ecological requirements. The aim of research conducted at the department of metallurgy and foundry of VSB-Technical University Ostrava is to verify the possibilities of production of metallic foams by conventional foundry processes, to study the process conditions and physical and mechanical properties of metal foam produced. Two procedures are used to create porous metal structures: Infiltration of liquid metal into the mold cavity filled with precursors or preforms and two stage investment casting.

Recycling of Waste Epoxy-Polyester Powders for Foam Production

2012 ◽  
pp. 91-101
Author(s):  
Carmine Lucignano ◽  
Erica Anna Squeo ◽  
Alessandro Guglielmotti ◽  
Fabrizio Quadrini
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Physical And Mechanical Properties ◽  
Industrial Applications ◽  
Compression Tests ◽  
Cold Compaction ◽  
Composite Foams ◽  
Domestic Appliances ◽  
Foam Production ◽  
Foaming Technology

This paper proposes a new foaming technology (solid-state foaming) to produce structural foams from waste thermosetting resins. The proposed technology is easy and does not require specific and expensive equipments. Solid tablets are produced by cold compaction of resin powder, and foam by heating in an oven. Composite foams can be produced by mixing fillers and resin powder before the cold compaction. In the experiment, an epoxy-polyester (EP-PE) resin powder, deriving from the waste of a manufacturer of domestic appliances, was used with montmorillonite (MMT) particles. Resulting foams with a filler content ranging from 0 to 10 wt% were characterized in terms of physical and mechanical properties (by compression tests). Although the effect of the MMT content seems to be negative for the adopted resin, the feasibility of producing composite foams by recycling waste industrial powders is shown. The properties of the unfilled foams are sufficient for many industrial applications.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

Physical and Mechanical Properties of Tenun Pahang Fabrics using Alternative Yarns

2016 ◽  
Vol 13 (2) ◽  
pp. 67
Author(s):  
Engku Liyana Zafirah Engku Mohd Suhaimi ◽  
Jamil Salleh ◽  
Suzaini Abd Ghani ◽  
Mohamad Faizul Yahya ◽  
Mohd Rozi Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Silk Fabrics ◽  
Recovery Angle ◽  
Made In

An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testings and three (3) mechanical testings conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.

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