scholarly journals On the relationships between cellular structure, deformation modes and electromechanical properties of piezoelectric cellular solids

2016 ◽  
Vol 80 ◽  
pp. 73-83 ◽  
Author(s):  
Sumantu Iyer ◽  
Maen Alkhader ◽  
T.A. Venkatesh
Keyword(s):  
Cellular Structure ◽  
Cellular Solids ◽  
Electromechanical Properties ◽  
Structure Deformation ◽  
Deformation Modes

scholarly journals Cellular Metals: Fabrication, Properties and Applications

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1545
Author(s):  
Isabel Duarte ◽  
Thomas Fiedler ◽  
Lovre Krstulović-Opara ◽  
Matej Vesenjak
Keyword(s):  
Cellular Structure ◽  
Base Material ◽  
Cellular Solids ◽  
Multifunctional Materials ◽  
Porous Metals ◽  
Cellular Metals

Cellular solids and porous metals have become some of the most promising lightweight multifunctional materials due to their superior combination of advanced properties mainly derived from their base material and cellular structure [...]

In SituX-Ray Tomography Measurements of Deformation in Cellular Solids

MRS Bulletin ◽  
2003 ◽  
Vol 28 (4) ◽  
pp. 284-289 ◽  
Author(s):  
E. Maire ◽  
A. Elmoutaouakkil ◽  
A. Fazekas ◽  
L. Salvo
Keyword(s):  
3D Imaging ◽  
Recent Literature ◽  
Three Dimensional ◽  
Cellular Solids ◽  
Aluminum Foams ◽  
3D Images ◽  
Closed Cell ◽  
Pertinent Information ◽  
Deformation Modes

AbstractThe use of microtomography to study the structure and especially the deformation modes of cellular solids is reviewed in this article. First, the technique is described in detail. Examples illustrating the power of the coupling ofin situdeformation with three-dimensional (3D) imaging, drawn from the recent literature and the authors' own work, are then given. The most detailed example is the study of the deformation modes of several samples made of different aluminum foams. Four kinds of closed-cell foams were investigated, corresponding to different routes available today for their manufacture. The initial macrostructure was quantified using the 3D images combined with 3D granulometry, allowing retrieval of pertinent information about the cell size and the wall and strut thicknesses. The global behavior exhibited by the foams during thein situcompression experiments was shown to vary from one brand of material to another. Some of these variations can be explained by differences in the known microstructure and the measured macrostructure of the samples.

Energy Absorption of Axial Members With the Inclusion of Functionally Graded Cellular Structure

2015 ◽  
Author(s):  
Muhammad Ali ◽  
Khairul Alam ◽  
Eboreime Ohioma
Keyword(s):  
Energy Absorption ◽  
Cellular Structure ◽  
Tube Wall ◽  
Axial Loading ◽  
Hybrid Structure ◽  
Functionally Graded ◽  
Shell Elements ◽  
Thin Walled ◽  
Energy Absorbing ◽  
Deformation Modes

Axial members are commonly used in automotive structures and are responsible for absorbing significant portion of impact energy in the event of an accident. This study was conducted to investigate the effects of inclusion of functionally graded cellular structures in thin walled members under compressive axial loading. A compact functionally graded cellular structure was introduced inside a 352 mm long square tube with side length and wall thickness of 74 mm and 3.048 mm, respectively. The tube wall material was aluminum. The cellular structure’s geometry was observed in the cross-section of a banana peel that has a specific graded cellular packing in a confined space. This packing enables the peel to protect the internal soft core from external impacts. The same cellular pattern was used to construct the structure in present study. The study was conducted using non-linear finite element analysis in ABAQUS. The hybrid structure (tube and graded cellular structure) was fixed on one side and on the other (free end) side, was struck by a rigid mass of 300 Kg travelling at a velocity of 35 mph (15.64 m/s) along the axis of the square tube and perpendicular to the in-plane direction of the graded cellular structure. The tube and cell walls were discretized using reduced integration, hourglass control, 4 nodes, and hexahedral shell elements. The impact plate was modeled with 4 node rigid shell elements. General contact conditions were applied to define surface interaction among graded structure, square tube, and rigid plate. The parameters governing the energy absorbing characteristics such as deformation or collapsing modes, crushing/ reactive force, and energy curves, were evaluated. The results showed that the inclusion of graded cellular structure increased the energy absorption capacity of the square tube by 41.06%. The graded structure underwent progressive stepwise, layer by layer, crushing mode and provided lateral stability to the square tube thus delaying local tube wall collapse and promoting outward convex localized folds on the tube’s periphery as compared to highly localized and compact deformation modes that are typically observed in an empty square tube under axial compressive loading. The variation in deformation mode, large contact areas, presence of graded cellular structure resulted in enhanced stiffness of the hybrid structure, and therefore, high energy absorption by the structure. The results of this preliminary study show a potential of functionally graded cellular materials to significantly improve the energy absorbing capacities of thin walled members under axial loading by altering member’s crushing deformation modes.

scholarly journals Effect of Porosity Gradient on Mechanical Properties of Cellular Nano-Composites

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 681
Author(s):  
Josef Jancar ◽  
Klara Zarybnicka ◽  
Jan Zidek ◽  
Frantisek Kucera
Keyword(s):  
Mechanical Properties ◽  
Cellular Structure ◽  
Spatial Organization ◽  
Wall Material ◽  
Nano Composites ◽  
Cellular Solids ◽  
Micro Particles ◽  
Static Mechanical ◽  
Hierarchical Architectures ◽  
Lightweight Engineering

With their hierarchical architectures incorporating gradients in composition, porosity, and orientation, natural materials have evolved optimized balance of mechanical properties. Deciphered from the structure of bamboo, we prepared cellular solids with convex and/or concave porosity gradient and investigated their static mechanical and impact properties. Non-monotonous porosity dependences of tensile, crush, and impact strength were related to the shape of porosity gradient rather than to the properties of the wall material alone. Our results provide experimental evidence, that novel mechanically robust low density additively fabricated cellular nano-composites with convex porosity gradient satisfy the structural requirements of lightweight engineering parts. Moreover, novel functions, such as reduced flammability or electrical conductivity, can easily be introduced by selecting the type and spatial organization of nanoparticles and cellular structure of the cellular micro-particles (CMPs).

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

Cellular Solids

1997 ◽  
Author(s):  
Lorna J. Gibson ◽  
Michael F. Ashby
Keyword(s):  
Cellular Solids
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