scholarly journals Deformation and Density Change of Open-Cell Nickel Foam in Compression Test

2017 ◽  
Vol 58 (10) ◽  
pp. 1373-1378 ◽  
Author(s):  
Woo-Young Kim ◽  
Ryo Matsumoto ◽  
Hiroshi Utsunomiya
Keyword(s):  
Compression Test ◽  
Nickel Foam ◽  
Density Change ◽  
Open Cell

scholarly journals Mechanical Properties Of The Ceramic Open-Cell Foams Of Variable Cell Sizes

2015 ◽  
Vol 60 (3) ◽  
pp. 1957-1964 ◽  
Author(s):  
Z. Nowak ◽  
M. Nowak ◽  
R.B. Pęcherski ◽  
M. Potoczek ◽  
R.E. Śliwa
Keyword(s):  
Mechanical Properties ◽  
Numerical Model ◽  
Compression Test ◽  
Young Modulus ◽  
Vertical Displacement ◽  
Finite Element Program ◽  
Open Cell ◽  
Open Cell Foam ◽  
Element Program ◽  
Deformation Processes

AbstractThe mechanical properties and numerical model of ceramic alumina open-cell foam, which is produced by the chemical method of gelcasting with different cell sizes (porosities) are presented. Geometric characteristics of real foam samples were estimated from tomographic and scanning electron microscopy images. Using this information, numerical foam model was proposed. A good agreement between the numerical model and the results elaborated from microtomography was obtained. To simulate the deformation processes the finite element program ABAQUS was used. The main goal of this computation was to obtain macroscopic force as a function of applied vertical displacement in compression test.As a result of numerical simulation of compression test of alumina foam for different values of porosity, the Young modulus and the strength of such foams were estimated.

Preparation and characterization of paraffin/nickel foam composites as neutron-shielding materials

2017 ◽  
Vol 52 (7) ◽  
pp. 953-962 ◽  
Author(s):  
Yun Zhang ◽  
Feida Chen ◽  
Xiaobin Tang ◽  
Hai Huang ◽  
Minxuan Ni ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Boron Carbide ◽  
Gamma Ray ◽  
Nickel Foam ◽  
Neutron Shielding ◽  
Static Compression ◽  
Neutron Absorber ◽  
Open Cell ◽  
Foam Composite ◽  
Nickel Foams

Traditional neutron-shielding materials usually have poor mechanical properties and secondary gamma-shielding capability. The new requirements of modern neutron-shielding materials are difficult to satisfy. A paraffin/nickel foam neutron-shielding composite was prepared and characterized in this study. Open-cell nickel foams were fabricated through electrodeposition. Subsequently, the paraffin/nickel foam composite were prepared by filling the open-cell nickel foams with melted paraffin. The intrinsic parameters of nickel foam and the content of neutron absorber (boron carbide) were controlled to optimize the composite. The mechanical properties of the composite were studied through a static compression test. The compressive strength improved to 0.4 times that of the nickel foams. The Am–Be source transmittance experiment showed that the 8 cm thick PFM presented a neutron transmittance of 56.1%, and the 6 cm thick boron carbide/paraffin/nickel foam (PFM-B) presented a neutron transmittance of 37.6%. The paraffin/nickel foam and PFM-B had approximately the same shielding efficiency as paraffin and boron carbide/paraffin, respectively. However, the second gamma ray shielding efficiency of the paraffin/nickel foam and PFM-B was significantly higher than that of paraffin and boron carbide/paraffin. The mechanical properties and secondary gamma ray-shielding capability of the composite can be improved by increasing the relative density of nickel foams.

Density change during the manufacturing process of PU-PE open cell auxetic foams

2010 ◽  
Vol 248 (1) ◽  
pp. 30-38 ◽  
Author(s):  
M. Bianchi ◽  
S. Frontoni ◽  
F. Scarpa ◽  
C. W. Smith
Keyword(s):  
Manufacturing Process ◽  
Density Change ◽  
Open Cell

An Evaluation of the Wicking Characteristics of Stochastic Open-Cell Nickel Foams

2006 ◽  
Author(s):  
Jessica Sheehan ◽  
Douglas T. Queheillalt ◽  
Pamela M. Norris
Keyword(s):  
Pore Size ◽  
Heat Pipe ◽  
Friction Factor ◽  
Capillary Tube ◽  
Nickel Foam ◽  
Heat Pipes ◽  
Working Fluid ◽  
Open Cell ◽  
Pipe System ◽  
Nickel Foams

Heat pipes are a very efficient device which can be used for the rapid transfer of thermal energy. Small and microscale heat pipes are used in a variety of applications such as electronics and microprocessor coolers. As the size of the heat pipe devices increase, the volume and rate at which the working fluid is replenished in the evaporator region becomes an important parameter influencing the performance of the heat pipe system. Here, a stochastic open-cell nickel-foam has been evaluated for use as the wick material in heat pipes. The pore size of the open-cell nickel foam was modified via compression in the through thickness direction in order to evaluate its wicking characteristics and fluid flow resistance as a function of pore size. These properties are controlled by the effective pore size (controlled via through thickness compression) of the nickel foam. The equilibrium wicking height was measured by a simple flow experiment. The mass flow rate and the differential pressure of the crushed foams were measured at each thickness to generate a friction factor as a function of pore size. The equilibrium wicking height results were compared to a simple analytical model of a single capillary tube and found to be in reasonable agreement and the friction factor followed the same trend as the equilibrium wicking height. The experiments were used to evaluate the suitability of stochastic open cell nickel foams as wicks for heat pipe systems.

Dynamic crushing of auxetic open-cell polyurethane foam

2002 ◽  
Vol 216 (12) ◽  
pp. 1153-1156 ◽  
Author(s):  
F Scarpa ◽  
J R Yates ◽  
L G Ciffo ◽  
S Patsias
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Polyurethane Foam ◽  
Compression Test ◽  
High Strain ◽  
Constant Speed ◽  
Open Cell ◽  
Open Cell Foam ◽  
Strain Rate Compression ◽  
Cell Foam

A high strain rate compression test with a constant speed of 1.5 m/s has been performed on samples of negative Poisson's ratio and normal open-cell polyurethane foam. The tests show that the transformation of the normal foam into the auxetic phase greatly increases the crashworthiness qualities of the open-cell foam.

Fretting wear behaviour of nickel foam struts used in fuel cell applications

2021 ◽  
pp. 135065012110059
Author(s):  
Gangisetty Venkatesh ◽  
Rajappa Gnanamoorthy ◽  
Masakazu Okazaki
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Metal Foam ◽  
Normal Load ◽  
Nickel Foam ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Fretting Wear ◽  
Wear Behaviour ◽  
Open Cell

In any proton-exchange membrane fuel cell, the bipolar plates grab attention because of the high production cost and heavyweight. Hence, the open-cell nickel foams are considered as an alternative to these grooved plates. The reliability of the metallic foams used as flow distributors and gas diffusion layers plays a vital role in the fuel cell's overall performance. Fretting wear damage of the metal foam at strut/strut interface and strut/supporting frame interface due to the vehicular vibrations and pressurized fuel flow is expected to affect the performance and is investigated. This paper discusses the fretting wear behaviour of nickel foam strut that constitutes open-cell nickel foam based on laboratory tests. The experiments are performed by using two different contact configurations: steel ball on wrought nickel flat and nickel strut on wrought nickel flat. The test results reveal the fretting friction coefficient's dependence on the normal load, surface roughness and contact geometry. Although the nickel strut versus nickel flat fretting wear tests showed a low coefficient of friction, severe damages were observed on the nickel struts’ worn surfaces compared to the wrought nickel flat. Scanning electron microscope images of worn scars on nickel foam struts indicate the presence of shallow grooves, craters, micro-cracks and delamination craters at higher loads.

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