Introduction to Physical Properties of Incommensurate Structures: From Modulated to Composite Structures

1992 ◽  
Vol 100-101 ◽  
pp. 367-0 ◽  
Author(s):  
Hérve Cailleau ◽  
C. Ecolivet
Keyword(s):  
Physical Properties ◽  
Composite Structures ◽  
Incommensurate Structures

Microstructure and physical properties of composite nonwovens produced by incorporating cotton fibers in elastic spunbond and meltblown webs for medical textiles

2021 ◽  
pp. 152808372110042
Author(s):  
Partha Sikdar ◽  
Gajanan S Bhat ◽  
Doug Hinchliff ◽  
Shafiqul Islam ◽  
Brian Condon
Keyword(s):  
Tensile Strength ◽  
Physical Properties ◽  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Barrier Properties ◽  
Cotton Fibers ◽  
Adult Care ◽  
Medical Textiles ◽  
Improved Performance

The objective of this research was to produce elastomeric nonwovens containing cotton by the combination of appropriate process. Such nonwovens are in demand for use in several healthcare, baby care, and adult care products that require stretchability, comfort, and barrier properties. Meltblown fabrics have very high surface area due to microfibers and have good absorbency, permeability, and barrier properties. Spunbonding is the most economical process to produce nonwovens with good strength and physical properties with relatively larger diameter fibers. Incorporating cotton fibers into elastomeric nonwovens can enhance the performance of products, such as absorbency and comfort. There has not been any study yet to use such novel approaches to produce elastomeric cotton fiber nonwovens. A hydroentangling process was used to integrate cotton fibers into produced elastomeric spunbond and meltblown nonwovens. The laminated web structures produced by various combinations were evaluated for their physical properties such as weight, thickness, air permeability, pore size, tensile strength, and especially the stretch recovery. Incorporating cotton into elastic webs resulted in composite structures with improved moisture absorbency (250%-800%) as well as good breathability and elastic properties. The results also show that incorporating cotton can significantly increase tensile strength with improved spontaneous recovery from stretch even after the 5th cycle. Results from the experiments demonstrate that such composite webs with improved performance properties can be produced by commercially used processes.

Physical Properties of composite structures of d- and s-wave superconductors (d-dot’s)

2006 ◽  
Author(s):  
Masaru Kato ◽  
Masaki Hirayama ◽  
Masahiko Machida ◽  
Tomio Koyama ◽  
Takakazu Ishida
Keyword(s):  
Physical Properties ◽  
Composite Structures ◽  
S Wave

scholarly journals Магнитострикция через магнитоэлектричество: использование магнитоэлектрического отклика для определения магнитострикционных характеристик композиционных мультиферроиков

2019 ◽  
Vol 45 (22) ◽  
pp. 36
Author(s):  
Д.А. Филиппов ◽  
В.М. Лалетин ◽  
Н.Н. Поддубная ◽  
V.V. Shvartsman ◽  
D.C. Lupascu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Physical Properties ◽  
Field Dependence ◽  
Lead Zirconate Titanate ◽  
Composite Structures ◽  
Lead Zirconate ◽  
Field Dependency ◽  
Voltage Coefficient ◽  
Magnetoelectric Response ◽  
Magnetoelectric Coefficient

A new way for determining the magnetostriction characteristics of a composite multiferroics using the magnetoelectric response of the structure is proposed. It is shown that integral from the field dependency of linear magnetoelectric coefficient is the magnetostriction characteristic of the structure. The results of an experimental study of the physical properties of bulk composites based on lead zirconate titanate and ferrite-nickel spinel are presented. Based on the field dependence of the magnetoelectric voltage coefficient, magnetostriction curves of composite structures with a content of ferrospinel of 10–70% were obtained.

Study on Stealthy Characteristics of Electromagnetic Metamaterials

2012 ◽  
Vol 531-532 ◽  
pp. 276-279
Author(s):  
Ye Liu ◽  
Zhu Ying Li ◽  
Wang Zhou Zhang
Keyword(s):  
Electromagnetic Wave ◽  
Composite Materials ◽  
Physical Properties ◽  
Composite Structures ◽  
Electromagnetic Property ◽  
Transmission Characteristics ◽  
Physical Size ◽  
Natural Laws ◽  
Forming Condition ◽  
Electromagnetic Metamaterials

Metamaterials are artificial composite structures or composite materials, which possess supernormal physical properties that natural materials don’t have. Through orderly designing the structures in the critical physical size of materials, we can render the materials to break through some restriction in some certain apparent natural laws. Electromagnetic metamaterials, which have the unusual electromagnetic property of controlling the transmission of electromagnetic wave, are discussed in this paper. Also, forming condition of the metamaterials is testified in theory. In metamaterials, electromagnetic wave could come up to be bending around certain boundary, but its transmission characteristics have no change. According to the superiority of the metamaterials, the metamaterials have the unique military value in the aspect of stealth. And if metamaterials are realized in militarily, it’s no doubt that the possessors will have predominance.

Adhesiveless Composite Structures With Carbon Fiber Prepregs for Aircraft Primary Structural Applications

2012 ◽  
Author(s):  
H. T. N. Gandy ◽  
R. Asmatulu
Keyword(s):  
Carbon Fiber ◽  
Physical Properties ◽  
Composite Structures ◽  
Moisture Absorption ◽  
Void Content ◽  
Adhesive Film ◽  
Cold Temperatures ◽  
Structural Applications ◽  
Honeycomb Sandwich ◽  
Primary Structures

The present work was focused on the properties of adhesiveless honeycomb sandwich structures with carbon fiber prepreg, while assessing the properties with adhesive films at the skin-to-core interface simultaneously. In this work, laminate and honeycomb sandwich panels were fabricated and tested with consistent lay-up, curing, and testing processes. The test specimens from the panels were tested for physical properties at room, hot, and cold temperatures, as well as different moisture absorption performances. The results confirmed that the self-adhesive prepreg physical properties met the components and void content recommendations used in primary structures of aircraft. The mechanical tests showed comparable results to panels, with prepreg and adhesive film at the skin-to-core interface, commonly used for primary structures.

Structure

2018 ◽  
Author(s):  
Ted Janssen ◽  
Gervais Chapuis ◽  
Marc de Boissieu
Keyword(s):  
Composite Structures ◽  
Inorganic Compounds ◽  
Dimensional Structure ◽  
Atomic Structures ◽  
Decagonal Quasicrystals ◽  
Modulated Structures ◽  
Solution Methods ◽  
Incommensurate Structures ◽  
Icosahedral Quasicrystals ◽  
Diffraction Patterns

This chapter discusses the X-ray and neutron diffraction methods used to study the atomic structures of aperiodic crystals, addressing indexing diffraction patterns, superspace, ab initio methods, the structure factor of incommensurate structures; and diffuse scattering. The structure solution methods based on the dual space refinements are described, as they are very often applied for the resolution of aperiodic crystal structures. Modulation functions which are used for the refinement of modulated structures and composite structures are presented and illustrated with examples of structure models covering a large spectrum of structures from organic to inorganic compounds, including metals, alloys, and minerals. For a better understanding of the concept of quasicrystalline structures, one-dimensional structure examples are presented first. Further examples of quasicrystals, including decagonal quasicrystals and icosahedral quasicrystals, are analysed in terms of increasing shells of a selected number of polyhedra. The notion of the approximant is compared with classical forms of structures.

Introduction

2018 ◽  
Author(s):  
Ted Janssen ◽  
Gervais Chapuis ◽  
Marc de Boissieu
Keyword(s):  
Physical Properties ◽  
Composite Structures ◽  
Periodic Structures ◽  
Classical Model ◽  
Historical Background ◽  
Group Symmetry ◽  
Background Information ◽  
General Description ◽  
Classical Approach ◽  
Crystalline Structures

First a general description of the concept of crystalline structures is presented with some historical background information. The classical approach of periodic structures is presented along with the important topic of symmetry and its role characterizing physical properties. The limitations of the classical model are then introduced in view of the new experimental observations discovered since the 1970s. New forms of crystalline structures including incommensurately modulated and composite structures are presented along with quasicrystalline structures (quasicrystals). The necessity to extend the theory of space group symmetry is then discussed and the concept of superspace symmetry is introduced in order to describe these new forms of matters.

Effects of Shape Geometry on the Efficiency of Self-Healing Polymers

2012 ◽  
Author(s):  
Ifeanyi J. Okoro ◽  
Yves Q. Yougoubare ◽  
Su-Seng Pang
Keyword(s):  
Aspect Ratio ◽  
Crack Propagation ◽  
Physical Properties ◽  
Shape Memory ◽  
Composite Structures ◽  
Direct Relationship ◽  
Shape Memory Polymers ◽  
Self Healing ◽  
Aspect Ratios ◽  
The Relationship

Autonomic smart self-healing composites are being developed and tested to deal with the problems of crack propagation and eventual damage. The recovery and self-healing efficiencies of these composite structures varies with changes in different physical properties such as temperature and shape geometry. The foremost steps in creating a self-healing composite are mixing and programming and recovery. This paper explores the relationship between a composite’s programming processes against its shape-geometry. Improving the programming and recovery would lead to an improved self-healing polymer. To this end, samples of self-healing shape-memory polymers of different aspect ratios are tested after programming and recovery, and their compressive strengths are compared. The results show a direct relationship between the compressive strengths and aspect ratio.

scholarly journals An Assessment to Replace Conventional Mild Steel with Hybrid Nanocomposite Steel to Improve Mechanical and Anticorrosive Properties

2020 ◽  
Vol 9 (4) ◽  
pp. 762-768
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Composite Structures ◽  
Research Study ◽  
Silicon Oxide ◽  
Nano Particles ◽  
Hybrid Nanocomposite ◽  
Thermal And Mechanical Properties ◽  
High Chemical ◽  
Anticorrosion Properties

Multi Walled Carbon nanotube’s (MWCNT’s) are tiny tube’s made of carbon atoms with a few nanometers in diameters and several microns in length. After Iijima's discovery in 1991, regarding the form of carbon atoms, a great deal of interest was drawn to utilize of MWCNTs outstanding chemical and physical properties such as high Young’s tube, tensile strength, excellent thermal and electrical conductiveness. Recently, MWCNT’s have been used in various fields, due to high chemical, thermal and mechanical properties. In the field of composite structures in which MWCNT’s are not only included in a matrix as an insulation but also to obtain other chemical and physical properties like corrosion resistance, mechanical properties and electrical conductivity. Multi walled carbon nanotube’s along with other nanoparticle’s such as grapheme oxide, zinc oxide, silicon oxide and cerium oxide nano particles which have been proven to have better mechanical and anticorrosion properties incorporated independently with MWCNT’s to develop hybrid nanocomposite’s offering a new composite material generation. Nanostructured composites enhance their sensitivity and efficiency when used in corrosive environment. In this research study an attempt is made to introduce new hybrid nanocomposite steels which can have higher mechanical and anticorrosive properties.

The Photometric Properties of the Ap Stars

1976 ◽  
Vol 32 ◽  
pp. 365-377 ◽  
Author(s):  
B. Hauck
Keyword(s):  
Physical Properties ◽  
Ap Stars

The Ap stars are numerous - the photometric systems tool It would be very tedious to review in detail all that which is in the literature concerning the photometry of the Ap stars. In my opinion it is necessary to examine the problem of the photometric properties of the Ap stars by considering first of all the possibility of deriving some physical properties for the Ap stars, or of detecting new ones. My talk today is prepared in this spirit. The classification by means of photoelectric photometric systems is at the present time very well established for many systems, such as UBV, uvbyβ, Vilnius, Geneva and DDO systems. Details and methods of classification can be found in Golay (1974) or in the proceedings of the Albany Colloquium edited by Philip and Hayes (1975).

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