THE INFLUENCE OF STRUCTURAL FEATURES OF COMPOSITE MATERIAL ON ITS MACROSCOPIC PROPERTIES

2014 ◽  
Vol 5 (2) ◽  
pp. 97-108
Author(s):  
S. E. Evlampieva ◽  
A. L. Svistkov
Keyword(s):  
Composite Material ◽  
Structural Features ◽  
Macroscopic Properties

Structural features of layered composite material TiB2/TiAl/Ti obtained by unrestricted SHS-compression

2021 ◽  
pp. 130165
Author(s):  
A.D. Prokopets ◽  
P.M. Bazhin ◽  
A.S. Konstantinov ◽  
A.P. Chizhikov ◽  
M.S. Antipov ◽  
...  
Keyword(s):  
Composite Material ◽  
Structural Features ◽  
Layered Composite ◽  
Layered Composite Material

scholarly journals Structural features of composite materials made of hydrolyzed birch wood

2021 ◽  
Vol 25 (4) ◽  
pp. 89-98
Author(s):  
Yu.G. Skurydin ◽  
◽  
E.M. Skurydina ◽  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Shear Modulus ◽  
Bending Strength ◽  
Structural Features ◽  
Dynamic Shear Modulus ◽  
Birch Wood ◽  
Dynamic Shear ◽  
Amorphous Component ◽  
Wood Processing

Structural features and physical and mechanical characteristics of plate composite materials are investigated. The materials are obtained from hydrolyzed birch wood by hot pressing without the addition of binding components. Wood processing is carried out by the method of explosive autohydrolysis without chemical reagents. The influence of pre-moistening of wood on the structure and properties of the composite material is studied. The structural features of the amorphous and crystalline components of the composite material are studied. It was found that the composite material obtained from pre-dried and pre-moistened wood retains the crystalline phase that is present in the original wood. Changes in the structure of wood when obtaining composite materials based on it occur in the amorphous component. Based on the temperature dependences of the dynamic shear modulus and the tangent of the angle of mechanical losses, information on the glass transition temperature of a complex of amorphous components of a composite material is obtained. It was found that the region of transition of lignin and hemicellulose macrochains from a glassy to a highly elastic state in the composite material is shifted towards low temperatures in comparison with the original wood. The offset is more than 70K. It is assumed that structural plasticization is the main cause of the detected effect. Pre-moistening of wood does not affect the position of the temperature transition in the amorphous component of the composite material. The study of the diffusion and sorption of water vapor in the samples of the material shows the presence of large structural inhomogeneities. Diffusion processes obey Fick’s second law and correlate with the density of samples. Data on density, static bending strength, water absorption and swelling characteristics of composite material samples were obtained. It is shown that the use of pre-moistening of wood before barothermal treatment significantly improves the structural uniformity of the resulting material. The value of the dynamic shear modulus at room temperature in comparison with the same indicator for the material obtained on the basis of dry wood increases three times. Mechanical losses are reduced, mechanical strength increases.

Research of Product Design in Physically Processed Type Based on Bamboo Composite Characteristics

2011 ◽  
Vol 382 ◽  
pp. 30-33 ◽  
Author(s):  
Li Li Zhang ◽  
Dong Yang Lin
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Product Design ◽  
Small Diameter ◽  
Structural Features ◽  
Chemical Components ◽  
Thin Wall ◽  
Geometric Configurations ◽  
Natural Composite ◽  
Line Type

Being a natural composite material, bamboo’s biological anatomy structure, chemical components and particularities in mechanical properties have some influences on the processing and manufacturing of bamboo materials. Based on micromechanical analysis and the combination of structural features of its hollow type curved surface and cleavability, this paper discusses about the feasibility about extension design of bamboo pole as a whole for modeling elements, any possible varieties by vertical and horizontal segmentation for diversified combinational designs like enclosure and assembly; as well as rationality about designing products models in association with line-type materials after cleavage and separation. In the meantime, it presents difficulties in processing and utilization owing to bamboo material’s characteristics in geometric configurations such as small diameter, hollowness, multisections, thin wall and taperingness, and also its only longitudinal fibers.

scholarly journals INVESTIGATION OF THE STRUCTURE AND MECHANICAL PROPERTIES OF A LAYERED COMPOSITE MATERIAL BY EXPLOSION WELDING

2020 ◽  
pp. 81-86
Author(s):  
A. Yu. Muizemnek ◽  
D. V. Kozlov ◽  
M. S. Gus’kov ◽  
A. V. Khorin ◽  
V. M. Batrashov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Structural Features ◽  
Layered Composite ◽  
Explosion Welding ◽  
Layered Composite Material

The paper indicates the technological features of obtaining a composite of the Ti-Al system. Investigations on the study of structural features and mechanical properties of a composite material reinforced with intermetallic elements are presented.

Nanostructural Characterization of Hydrothermally Stable γ-Alumina-Based Composite Materials by Transmission Electron Microscopy

2007 ◽  
Vol 26-28 ◽  
pp. 1109-1112
Author(s):  
Shinji Fujisaki ◽  
Md. Hasan Zahir ◽  
Yumi H. Ikuhara ◽  
Yuji Iwamoto ◽  
Kotaro Kuroda
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Transmission Electron Microscopy ◽  
Composite Material ◽  
Sol Gel ◽  
Structural Features ◽  
Hydrothermal Stability ◽  
Transmission Electron ◽  
Al2o3 Composite ◽  
Powder Samples

La2O3 and/or Ga2O3 doped, and the double dopant γ-Al2O3 composite powder samples were prepared by the sol-gel method. Nanostructural characterizations of the powder samples were performed by high resolution transmission electron microscopy (HRTEM) in order to clarify the role of the metal oxide dopants for the improved hydrothermal stability of the La2O3-doped Ga2O3-Al2O3 composite material. The results of HRTEM study and selected area electron diffraction (SAED) analysis revealed the formation of the uniform solid solution of Ga2O3-Al2O3. In addition, the results of X-ray elemental mapping analysis revealed the existence of well-dispersed La2O3 on the grain surface of Ga2O3-Al2O3 solid solution. These structural features could act an important role for the improved hydrothermal stability of the La2O3-doped Ga2O3-Al2O3 composite material.

Study of structural features, strength properties, and heat resistance of a dispersion-hardened composite material based on nickel intermetallide

2016 ◽  
Vol 7 (4) ◽  
pp. 603-609 ◽  
Author(s):  
N. P. Burkovskaya ◽  
I. Yu. Efimochkin ◽  
O. A. Bazyleva ◽  
E. Yu. Turenko ◽  
N. V. Sevostyanov ◽  
...  
Keyword(s):  
Composite Material ◽  
Heat Resistance ◽  
Structural Features ◽  
Strength Properties

Electron microscopy and diffraction studies of polyimides

1983 ◽  
Vol 41 ◽  
pp. 28-29
Author(s):  
O.C. de Hodgins ◽  
K. R. Lawless ◽  
R. Anderson
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Structural Features ◽  
Inert Atmosphere ◽  
Polyimide Films ◽  
Resolution Electron ◽  
The Matrix ◽  
High Resolution Electron Microscope ◽  
Diffraction Patterns ◽  
Polymeric Samples

Commercial polyimide films have shown to be homogeneous on a scale of 5 to 200 nm. The observation of Skybond (SKB) 705 and PI5878 was carried out by using a Philips 400, 120 KeV STEM. The objective was to elucidate the structural features of the polymeric samples. The specimens were spun and cured at stepped temperatures in an inert atmosphere and cooled slowly for eight hours. TEM micrographs showed heterogeneities (or nodular structures) generally on a scale of 100 nm for PI5878 and approximately 40 nm for SKB 705, present in large volume fractions of both specimens. See Figures 1 and 2. It is possible that the nodulus observed may be associated with surface effects and the structure of the polymers be regarded as random amorphous arrays. Diffraction patterns of the matrix and the nodular areas showed different amorphous ring patterns in both materials. The specimens were viewed in both bright and dark fields using a high resolution electron microscope which provided magnifications of 100,000X or more on the photographic plates if desired.

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