A Preliminary Study on Cell Wall Architecture of Titanium Foams

2009 ◽  
Vol 1188 ◽  
Author(s):  
Nihan Tuncer ◽  
Luc Salvo ◽  
Eric Maire ◽  
Gürsoy Arslan
Keyword(s):  
Weight Ratio ◽  
Cost Savings ◽  
High Strength ◽  
Processing Parameters ◽  
Inert Atmosphere ◽  
Theoretical Density ◽  
Space Holder ◽  
Wide Range ◽  
Powder Characteristics ◽  
Foamed Metals

AbstractBio-inspired architectures, especially metallic foams, have been receiving an increasing interest for the last 10 years due to their unusual mechanical properties. Among commonly dealt foamed metals, like aluminum and steel, titanium possesses a distinctive place because of its high strength-to-weight ratio, excellent corrosion resistance and biocompatibility. In this study, Ti foams were produced by a very simple and common method, sintering under inert atmosphere with fugitive space holder. Removal of the space holder was conducted by dissolution in hot deionized water which makes it possible to minimize contamination of Ti. Sintering of remaining Ti skeleton at 1300 °C offered a wide range of properties and cost savings. The effects of the processing parameters such as sintering temperature and powder characteristics on the 3D foam architecture were investigated by using X-ray microtomography (μ-CT). Use of bimodal Ti powders caused a decrease in final theoretical density when compared to the ones prepared with the same amount of space holder but with monomodal Ti powders. It was also observed that the use of bimodal Ti powders decreased compressive strength, by introducing pores into the cell walls, when compared to the ones having the same theoretical density.

A Comparative Assessment of Austempered Ductile Iron as a Substitute in Weight Reduction Applications

2008 ◽  
Author(s):  
Ashwin Polishetty ◽  
Sarat Singamneni ◽  
Guy Littlefair
Keyword(s):  
Ductile Iron ◽  
High Performance ◽  
Material Selection ◽  
Weight Ratio ◽  
Cost Savings ◽  
High Strength ◽  
Good Choice ◽  
Comparative Assessment ◽  
Austempered Ductile Iron ◽  
Machining Characteristics

Manufacturing engineering has had to undergo drastic changes in the approach to material selection in order to meet new design challenges. In the automotive industry, researchers in their effort to reduce emissions and satisfy environmental regulations, have shifted their focus to new emerging materials such as high-strength aluminium alloys, metal matrix composites, plastics, polymers and of late, Austempered Ductile Iron (ADI). ADI is a good choice for design where the criterion is high performance at reduced weight and cost. The unique, ausferrite microstructure gives the material desirable material properties and an edge over other materials. A comparative study of ADI in terms of materials properties and machining characteristics with other materials is desirable to highlight the potential of the material. This paper focuses on a comparative assessment of material and machining characteristics of ADI for different applications. The properties under consideration are machinability, weight and cost savings and versatility. ADI has a higher strength-to-weight ratio than aluminium making it a ready alternative for material selection. In terms of machinability, there are some problems associated with machining of ADI due to its work hardening nature. This paper attempts to identify the possible potential applications of ADI, by critically reviewing specific applications such as machinability, overall economics and service.

scholarly journals Numerical and Experimental Investigation of Formability in Incremental Sheet Forming of Particle Reinforced Metal Matrix Composite Sheets

2021 ◽  
Author(s):  
Shakir Gatea ◽  
Thana Abdel Salam Tawfiq ◽  
Hengan Ou
Keyword(s):  
Metal Matrix ◽  
Room Temperature ◽  
Single Point ◽  
Weight Ratio ◽  
High Strength ◽  
Operating Conditions ◽  
Particle Composite ◽  
Heat Treated ◽  
Wide Range ◽  
Sic Particle

Abstract Metal matrix composites (MMCs) have a high strength-to-weight ratio, high stiffness, and good damage resistance under a wide range of operating conditions, making them a viable alternative to traditional materials in a variety of technical applications. Because of their high strength, composite materials are hard to deform to a significant depth at room temperature. As a result, additional treatments are required to enhance the composite's room ductility prior to deformation. In this investigation, as-received 6092Al/SiCp composite sheets (T6-condition) are heat treated to O-condition annealing to enhance its ductility in order to assess the influence of single point incremental forming (SPIF) parameters on the formability and fracture behavior of the Al/SiC particle composite sheets at room temperature. Then the annealed sheets are heat treated to T6-condition to enhance the strength and achieve properties equivalent to as-received sheets properties. The results demonstrate that the Al/SiC particle composite sheets with T6 treatment could not be deformed to the specified depth at room temperature due to low room ductility and that further treatment, such as O-condition annealing, is required to enhance the room ductility. When annealed Al/SiCp composite sheets are heat treated to T6, the sheets exhibit properties comparable to the as-received sheets. Al/SiC particle composite sheets with low SPIF parameters may have greater formability and fracture depth with low strain hardening curve.

Experimental Investigation on Flexural Behavior of Cold Formed Beams with Lightweight Concrete

2020 ◽  
Vol 992 ◽  
pp. 149-155
Author(s):  
AL-Hasnawi Yasser Sami Ghareb ◽  
Omar Ismael Alhashimi ◽  
Andrey V. Shevchenko ◽  
Nowruzi Mohammad Shoja
Keyword(s):  
Lightweight Concrete ◽  
Weight Ratio ◽  
High Strength ◽  
Flexural Behavior ◽  
Project Work ◽  
Wide Range ◽  
Cold Formed Steel ◽  
Reinforcement Bar ◽  
Hot Rolled ◽  
Hot Rolled Steel

In recent years, thin-walled, cold-formed steel (CFS) structural members have gained expanding use in building construction and various sorts of structural systems [1,2,3].The utilization Cold-Formed Steel (CFS) structures has become progressively popular in different fields of building technology. The reasons behind the developing popularity of these products include their ease of fabrication, high strength/weight ratio and suitability for a wide range of applications. These advantages can result in more economic designs, as compared with hot-rolled steel, especially in short-span applications. In this project work attempt has been made to use Cold formed steel section as replacement to conventional steel reinforcement bar.

Light Steel Thin -Walled Structures Composite Beam of Cellular Concrete

2019 ◽  
Vol 974 ◽  
pp. 596-600
Author(s):  
AL-Hasnawi Yasser Sami Ghareb ◽  
Andrey V. Shevchenko ◽  
Omar Ismael Alhashimi
Keyword(s):  
Weight Ratio ◽  
Steel Structures ◽  
High Strength ◽  
Project Work ◽  
Thin Walled Structures ◽  
Wide Range ◽  
Cold Formed Steel ◽  
Cost Efficient ◽  
Reinforcement Bar ◽  
Cellular Concrete

The cost-efficient field design is very important in the civil engineering. Therefore, the cold-formed steel structures (CFS) are preferred for construction. A Sophisticated CFS structure which uses a Cellular Concrete is implemented in this paper. The utilization Cold-Formed Steel (CFS) structures have become increasingly popular in different fields of building technology. The reasons behind the growing popularity of these products include their fabrication ease, high strength/weight ratio and suitability for a wide range of applications. These advantages can result in more economic designs, as compared with hot-rolled steel, especially in short-span applications. In this project work an attempt to use a Cold formed steel section as replacement to conventional steel reinforcement bar has been made.

Press and Sintering of Titanium

2016 ◽  
Vol 704 ◽  
pp. 369-377 ◽  
Author(s):  
Robert Frykholm ◽  
Benjamin Brash
Keyword(s):  
Density Ratio ◽  
High Strength ◽  
Cost Effective ◽  
Processing Parameters ◽  
Limiting Factors ◽  
Wide Range ◽  
The Press ◽  
Powder Properties ◽  
Effective Use ◽  
Machining Operations

Titanium based alloys show very high strength to density ratio, and could be the choice of material for a wide range of applications. By practicing press and sintering for production of Ti components, high materials utilization can be assured, and at the same time costly machining operations can be limited. Difficulties in processing and high cost for powders have been limiting factors for progress, but recent development indicates good possibilities on cost effective use of TiH2 powder in the press and sintering segment. In this paper, influence of processing parameters and powder properties on final sintered component properties are discussed.

scholarly journals Manufacturing and Mechanical Behavior of (Al/SiC) Functionally Graded Material using Powder Metallurgy Technique

2019 ◽  
Vol 8 (9) ◽  
pp. 1835-1839 ◽  
Keyword(s):  
Powder Metallurgy ◽  
Functionally Graded Materials ◽  
Pure Aluminum ◽  
Weight Ratio ◽  
Mesh Size ◽  
High Hardness ◽  
High Strength ◽  
Functionally Graded ◽  
Graded Materials ◽  
Wide Range

This research focuses on manufacturing and mechanical characterization of functionally graded materials using powder metallurgy techniques. Owing to its low density and high strength to weight ratio, pure aluminum with mesh size No. 200 is chosen as the matrix. Silicon carbide with mesh size No. 220, which has a wide range of applications due to its high hardness, is selected as reinforcement. Specimens of two functionally graded materials(FGM) with 4 layers (0%, 3%, 7%, 10%)(FGM-1) and 5 layers (10%, 20%, 30%, 40%, 50%) (FGM-2) are sintered by varying the SiC composition from layer to layer. From the microstructure, it is clearly evident that four layered specimens achieved more homogeneous mixture than five layered. Also, mechanical properties of four layered specimens attained better results than five layered specimens.

scholarly journals Experimental Investigation on Mechanical Properties of Carbon Nanotube-Reinforced Epoxy Composites for Automobile Application

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Anjibabu Merneedi ◽  
L. Natrayan ◽  
S. Kaliappan ◽  
Dhinakaran Veeman ◽  
S. Angalaeswari ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Short Form ◽  
Chemical Properties ◽  
Weight Ratio ◽  
High Strength ◽  
Full Potential ◽  
Design Engineers ◽  
Wide Range ◽  
Potential Carbon

Carbon nanotubes are established as a superior form of carbon. These have superior characteristics in terms of mechanical and chemical properties when compared to the other fibres available. High-strength fibres can be employed in a composite in a short form and mass-produced to fulfil high demands in composite applications. These composites can meet the strength requirements of nonstructural and structural components in a wide range of industries. Because of their light weight and excellent strength-to-weight ratio, these composites can be used in a wide range of applications. With Young’s modulus as high as 1 TPa and tensile strength up to 63 GPa, they are among the stiffest and strongest fibres. There is currently a lot of interest in using carbon nanotubes in a matrix to take advantage of these features. There have been a variety of polymer matrices used, and nanotube/ceramic and nanotube/metal composites are gaining popularity. The study of these materials is an ongoing process, as researchers and design engineers have yet to realize their full potential. Carbon nanotubes (CNTs) are used in this study to create the composite with the resin. The percentage of CNT used as a filler material in the composite is varied from 1 to 4 percent, with the best percentage chosen for optimal mechanical properties.

scholarly journals The Effect of Selective Laser Melting Process Parameters on the Microstructure and Mechanical Properties of Al6061 and AlSi10Mg Alloys

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 12 ◽  
Author(s):  
Ahmed Maamoun ◽  
Yi Xue ◽  
Mohamed Elbestawi ◽  
Stephen Veldhuis
Keyword(s):  
Mechanical Properties ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
High Strength ◽  
Melting Process ◽  
Laser Melting ◽  
Influence Of Process Parameters ◽  
Wide Range ◽  
Powder Characteristics

Additive manufacturing (AM) offers customization of the microstructures and mechanical properties of fabricated components according to the material selected and process parameters applied. Selective laser melting (SLM) is a commonly-used technique for processing high strength aluminum alloys. The selection of SLM process parameters could control the microstructure of parts and their mechanical properties. However, the process parameters limit and defects obtained inside the as-built parts present obstacles to customized part production. This study investigates the influence of SLM process parameters on the quality of as-built Al6061 and AlSi10Mg parts according to the mutual connection between the microstructure characteristics and mechanical properties. The microstructure of both materials was characterized for different parts processed over a wide range of SLM process parameters. The optimized SLM parameters were investigated to eliminate internal microstructure defects. The behavior of the mechanical properties of parts was presented through regression models generated from the design of experiment (DOE) analysis for the results of hardness, ultimate tensile strength, and yield strength. A comparison between the results obtained and those reported in the literature is presented to illustrate the influence of process parameters, build environment, and powder characteristics on the quality of parts produced. The results obtained from this study could help to customize the part’s quality by satisfying their design requirements in addition to reducing as-built defects which, in turn, would reduce the amount of the post-processing needed.

Influence of different crosslinking mixtures on the mechanical properties of composite solid rocket propellants based on HTPB

2020 ◽  
pp. 095400832094035
Author(s):  
Islam K Boshra ◽  
Guo Lin ◽  
Ahmed Elbeih
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Crosslinking Agent ◽  
Weight Ratio ◽  
High Strength ◽  
Rocket Propellants ◽  
Wide Range ◽  
Solid Rocket ◽  
Solid Rocket Propellants ◽  
Composite Solid

The crosslinking agent is a vital key which affects the mechanical properties of composite solid rocket propellants (CSRPs). Under this scheme, the effect of crosslinking mixtures (CMs) based on trimethylolpropane (TMP) as a triol crosslinker and butanediol (BD) as a chain extender on CSRPs based on hydroxyl-terminated polybutadiene was investigated. A series of 27 propellant compositions was formulated to study the mechanical properties of the prepared CSRPs. The effect of changing the weight ratio of TMP to BD in the CM was studied. In addition, the influence of increasing the percentage of CM (from 0% to 0.5%) in the prepared samples was investigated. Also, the effect of the CM on CSRPs containing different curing ratio of NCO/OH = 0.7, 0.75, and 0.8 was studied to generate the largest possible strain-ability with high strength over different levels of curing conditions. The mechanical characteristics (tensile strength and strain) of the prepared CSRPs have been measured and plotted versus CM content, NCO/OH and TMP:BD ratio. Generally, the addition of CM leads to a remarkable enhancement in the propellant mechanical properties. Samples containing TMP:BD (2:1) provide the highest strength while samples containing TMP:BD (1:2) show the highest strain over all the NCO/OH ratios. Formulations with TMP:BD (1:1) give high strength with moderate strain. Variation in CM content has a remarkable influence on the mechanical properties of CSRPs. A wide range of tensile strength and strain were obtained from this study to offer variety of results suitable for different applications in the CSRPs technology.

Enhancing the mechanical properties of SCF/PEEK composites in FDM via process-parameter optimization

2021 ◽  
pp. 095400832110036
Author(s):  
Bin Hu ◽  
Zehua Xing ◽  
Weidong Wu ◽  
Xiaojun Zhang ◽  
Huamin Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fused Deposition Modeling ◽  
Low Cost ◽  
Weight Ratio ◽  
High Strength ◽  
Processing Parameters ◽  
High Viscosity ◽  
Polymer Composite Material ◽  
Fused Deposition ◽  
Deposition Modeling

Short-carbon-fiber (SCF)–reinforced poly-ether-ether-ketone (PEEK) is a promising polymer composite material with good biocompatibility, a high strength-to-weight ratio, and low friction properties. In artificial-bone fabrication and other applications with more flexible fabrication demands, fused-deposition modeling (FDM) technology enables the rapid and low-cost fabrication of SCF/PEEK parts with sophisticated structures. Owing to the high viscosity of melting PEEK composites, great challenges, associated with the poor internal interface, need to be overcome before enhanced mechanical properties can be obtained. In this study, key processing parameters and various SCF amounts were studied to investigate their effects on the mechanical properties of PEEK composites. It was revealed that the existence of voids and gaps between the SCF and PEEK led to a decrease in the strength of the composite systems. The FDM processing parameters were tuned to eliminate these defects in the PEEK composites. The tensile strength of the 2% SCF/PEEK sample reached 96.4 MPa, which is comparable to that of PEEK parts prepared by injection molding. Meanwhile, its elastic modulus reached 2.6 GPa, which is 169% higher than that of the bare PEEK sample.

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