scholarly journals Dynamic characterization of tungsten carbide behaviour at very high strain-rates

2018 ◽  
Vol 183 ◽  
pp. 02061
Author(s):  
Benjamin Erzar ◽  
Jean-Luc Zinszner
Keyword(s):  
Tungsten Carbide ◽  
High Efficiency ◽  
High Strength ◽  
Loading Path ◽  
Dynamic Characterization ◽  
Lagrangian Analysis ◽  
The Impact ◽  
Very High ◽  
Cemented Tungsten Carbide

Cemented tungsten carbide, with its very high density and high strength, is known to be the material composing several small calibre armour piercing ammunitions. The impact of a tungsten carbide core projectile onto a high efficiency armour often leads to the fracture of the tungsten carbide core. Thus, the pertinence of material models used in numerical simulations to describe the behaviour and the damage of the target is not sufficient to well predict a ballistic impact. In this work, the GEPI high-pulsed power generator is used to conduct dynamic characterization of the behaviour of a cemented tungsten carbide under both compressive and tensile loadings. The Hugoniot Elastic Limit of this material has been identified (HEL = 5.8 GPa). Moreover, Lagrangian analysis allowed the complete loading path to be identified up to 18 GPa.

scholarly journals A New Testing Machine for the Dynamic Characterization of High Strength Low Damping Fiber Materials

2016 ◽  
Vol 57 (1) ◽  
pp. 65-74 ◽  
Author(s):  
R. Ceravolo ◽  
A. De Marchi ◽  
E. Pinotti ◽  
C. Surace ◽  
L. Zanotti Fragonara
Keyword(s):  
Testing Machine ◽  
High Strength ◽  
Dynamic Characterization ◽  
Fiber Materials

Pulse Electrochemical Micromachining of Tungsten Carbide

2012 ◽  
Author(s):  
Abishek Balsamy Kamaraj ◽  
Rachael Dyer ◽  
Murali M. Sundaram
Keyword(s):  
Tungsten Carbide ◽  
Feed Rate ◽  
Dimensional Accuracy ◽  
High Strength ◽  
Electrochemical Micromachining ◽  
Manufacturing Method ◽  
Interelectrode Gap ◽  
Wide Range ◽  
Complex Shapes ◽  
Very High

Pulse electrochemical micromachining (PECMM) is a non-conventional manufacturing method suitable for the production of micro-sized components on a wide range of conductive materials. PECMM improves dimensional accuracy and simplifies tool design in machining hard, high strength, and heat resistant materials into complex shapes. Extremely small interelectrode gaps are required in PECMM for better dimensional accuracy. However, excessively small interelectrode gaps may lead to complications like short-circuiting. This imposes the need for better control of the PECMM process. In this study a feedback controlled PECMM system was developed for the electrochemical micromachining of tungsten carbide. It was noticed that while, higher ratios of return velocity to feed rate is preferred as it reduces the number of current spikes, very high value of this ratio results in poor machining rates due to increased interelectrode gap. Therefore, this ratio of return velocity to feed rate may be used to optimize the PECMM process.

scholarly journals Production and Characterization of Amorphous Aluminum-Copper Alloy for Aerospace Applications

2017 ◽  
Vol 2 (2) ◽  
pp. 1 ◽  
Author(s):  
Olayide R. Adetunji ◽  
Muyiwa L. Olukuade ◽  
Wojciech Simka ◽  
Maciej Sowa ◽  
Olanrewaju Moses Adesusi ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Glassy Alloy ◽  
Control Sample ◽  
High Strength ◽  
Sem Images ◽  
Aerospace Applications ◽  
Cu Alloy ◽  
Aluminium Copper ◽  
The Impact

The main objective of this research is to produce and characterize amorphous Aluminium copper (Cu) alloy for high strength applications. High grade of both Aluminium and copper ingots were charged to a ceramic mould and put in an electric furnace in the ratio of 13:1 of Al and Cu respectively. The furnace temperature was set at 1300oC and after melting, ingot casting was done using plastic mould with sprayed water to achieve rapid cooling. An amorphous metal or glassy structure was produced from the ingot by super cooling through preheating the cast rod to 600oC and rapid cooled by water quenching. The glassy alloy rods and Al control sample were prepared for Scanning Electron Microscope (SEM), tensile and impact toughness characterizations. The results showed SEM images of the Al-Cu alloy and pure Al samples. The ultimate tensile strengths for Al-Cu and Al samples were 399 and 330 kg/m2 respectively. Similarly, the impact strengths obtained were 27.3 and 26.4 J. It can be concluded that glassy phase Al-Cu alloy was produced with high ultimate tensile strength and impact toughness. The amorphous alloy produced is a good structural material for aerospace applications. 

Characterization of High Strength Cu/Ag Multilayered Composites

1996 ◽  
Vol 451 ◽  
Author(s):  
Qing Zhai ◽  
Dan Kong ◽  
Augusto Morrone ◽  
Fereshteh Ebrahimi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electroless Deposition ◽  
Pure Copper ◽  
High Strength ◽  
Cyanide Solution ◽  
Single Bath ◽  
Multilayered Composites ◽  
Very High

ABSTRACTIn this study, electrodeposition was employed to produce Cu-Ag multilayered nanocomposites using a single-bath cyanide solution. The silver and the copper layers were applied by electroless deposition and galvanostatic electrodeposition methods, respectively. The as-deposited composite showed a very high strength, which was increased upon annealing at 104°C. Annealing at 149°C caused the strength to drop to a level comparable to the strength of electrodeposited pure copper specimens. In this paper, the effect of heat treatment on the mechanical properties and structure of Cu-Ag multilayered nanocomposites is discussed.

Preparation and Characterization of Fibrillated Nanofibrous Filter Material

2014 ◽  
Vol 936 ◽  
pp. 327-331 ◽  
Author(s):  
Tian Yu ◽  
Yan Bin Jiang ◽  
Jian Hu
Keyword(s):  
High Efficiency ◽  
Fiber Material ◽  
Filter Material ◽  
Air Permeability ◽  
Filtration Efficiency ◽  
Structure And Properties ◽  
Nanofiber Morphology ◽  
Opposite Trend ◽  
The Impact

The nanofiber, which diameter less than 1000 nm, has been discovered as advanced fiber material for high efficiency filtration. Tencel fiber is a new kind of regenerated fiber which can be easily fibrillated by a mechanical beating process to form nanofiber morphology. The present study shows the nanofiber morphology of Tencel fiber and investigates how the structure and properties of filter material change with the impact of fibrillated nanofiber. The results show a mass of nanofibril appeared after the Tencel fiber is intensively beat. At the same time, the air permeability and pore size of filter material is decreased with the decrease of fibrillated nanofiber content while the strength gets an opposite trend. Whats more, the filtration efficiency of the filter material is significantly enhanced by fibrillated nanofiber which filtration rate achieves 6.3 for particles bigger than 4 μm at 20 wt%. This paper has shed some light on the application of fibrillated fibrillated nanofiber to enhance the efficiency of filter material effectively.

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