STUDY ON THE MECHANICAL BEHAVIOUR OF MULTI-LAYERED COMPOSITE MATERIALS USED IN THE PRESSURE VESSELS CONSTRUCTION

2016 ◽  
Keyword(s):  
Composite Materials ◽  
Mechanical Behaviour ◽  
Layered Composite ◽  
Pressure Vessels ◽  
Materials Used

scholarly journals Various ways to build effective characteristics for a pipe made of a layered composite material

2019 ◽  
Vol 97 ◽  
pp. 02027
Author(s):  
Tatiana Bobyleva ◽  
Alexey Shamaev
Keyword(s):  
Composite Materials ◽  
Computer Calculation ◽  
Analytical Form ◽  
Homogenization Method ◽  
Layered Composite ◽  
Effective Characteristics ◽  
Stiffness Characteristics ◽  
Analytical Result ◽  
Materials Used ◽  
The Individual

Composite materials consisting of several phases are widely used in modern construction. Numerous experiments have shown that the properties of structurally heterogeneous materials can differ significantly from those of the individual components making up the composition. Besides, rapidly changing coefficients of differential equations describing such composite materials greatly complicate the solution of boundary value problems even with the help of computer calculation methods. Therefore, the homogenization method is used. In this paper the two approaches propose to obtain in explicit analytical form the effective model of the problem of loading a heterogeneous pipe made of layered material, provided that the elastic properties of the material depend only on the distance from the center of the section of the pipe. We point to a method that obviously leads to an analytical result. It follows from the article that it is possible to choose the function that determines the structure of the “winding” in such a way as to obtain the stiffness characteristics of the pipe as close as possible to the desired with fixed mass fractions of the materials used. A similar approach can be applied to the study of creep properties of pipes made of composite materials.

scholarly journals Raman Spectroscopy for the Nondestructive Testing of Carbon Fiber

2008 ◽  
Vol 2008 ◽  
pp. 1-3 ◽  
Author(s):  
Glenn Washer ◽  
Frank Blum
Keyword(s):  
Raman Spectroscopy ◽  
Composite Materials ◽  
Carbon Fiber ◽  
High Performance ◽  
Fiber Composite ◽  
Condition Assessment ◽  
Pressure Vessels ◽  
Carbon Fiber Composite ◽  
Available Carbon ◽  
Materials Used

The goal of this research is to evaluate the potential of Raman spectroscopy as a method of condition assessment for carbon fiber composite materials used in high performance situations such as composite overwrapped pressure vessels (COPVs). There are currently limited nondestructive evaluation (NDE) technologies to evaluate these composite materials in situ. Variations in elastic strain in the composite material can manifest from degradation or damage, and as such could provide a tool for condition assessment. The characterization of active Raman bands and the strain sensitivity of these bands for commercially available carbon fibers are reported.

scholarly journals Double-layered fiber for lightweight flexible clothing providing shielding from low-dose natural radiation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seon-Chil Kim ◽  
Jun Sik Son
Keyword(s):  
Low Dose ◽  
Layered Composite ◽  
Radiation Shielding ◽  
Flight Attendants ◽  
Low Dose Radiation ◽  
Natural Radiation ◽  
Composite Yarn ◽  
Materials Used ◽  
Fiber Fabric ◽  
Dose Radiation

AbstractNatural and medical radiation are the most frequent sources of daily low-dose radiation exposure for the general public, but these radiation levels are generally acceptable. Among various occupations, aviation crew members and medical workers are exposed to high levels of radiation from scattered rays. This study focused on developing clothing for shielding aviation crew members from natural radiation during air travel. Materials were selected considering their radiation-shielding properties. A tungsten double-layered composite yarn and a polyethylene terephthalate (PET) fiber fabric containing BaSO4 were manufactured. The characteristics and shielding performances of the products were analyzed. Prototypes of a protective scarf (for shielding the thyroid gland) and apron (for shielding the torso) for flight attendants were produced. A lightweight fabric was produced that neither restricts the movement of the wearer nor causes them skin discomfort. The shielding performances of the tungsten composite and PET fiber fabrics containing BaSO4 were 0.018 mmPb and 0.03 mmPb, respectively, demonstrating low-dose shielding that may be useful for protecting aviation crew members from scattered rays. The characteristics of the developed fibers are comparable to those of materials used in clothing production; therefore, low-dose radiation-shielding clothing could be manufactured for use in aviation, medical, and other industries.

Surface Charging Considerations for Composite Materials Used in Spacecraft Applications

2015 ◽  
Vol 43 (9) ◽  
pp. 2901-2906
Author(s):  
Justin J. Likar ◽  
Robert E. Lombardi ◽  
Alexander L. Bogorad ◽  
Roman Herschitz
Keyword(s):  
Composite Materials ◽  
Surface Charging ◽  
Materials Used

Investigation of Fracture in Transparent Glass Fiber Reinforced Polymer Composites Using Photoelasticity

2002 ◽  
Author(s):  
Sanjeev K. Khanna ◽  
Marius D. Ellingsen ◽  
Robb M. Winter
Keyword(s):  
Composite Materials ◽  
Fatigue Cracks ◽  
Large Body ◽  
Mechanical Analysis ◽  
Pressure Vessels ◽  
High Ratio ◽  
Material Behavior ◽  
Engineering Structures ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Polymer Composites

Composite materials are widely used in mechanical structures where a high ratio of strength or stiffness to weight is desired. Not only are composite materials widely used in building recreational equipment such as skis, snowboards or even sports cars, but also multiple types of military aircraft are built from composite materials. Airplane bodies are in principle cyclically loaded pressure vessels and are susceptible to the formation of fatigue cracks, and it is necessary to possess knowledge of how the material behaves with a crack present. In fact, all engineering structures have to be designed with the presence of crack like defects in mind. For traditional engineering materials such as steel and aluminum there exists a large body of knowledge regarding material behavior in the presence of a crack. Furthermore, their isotropic nature eases the process of mechanical analysis. Photoelasticity, an optical method, has been widely used to study fracture in isotropic transparent materials (Irwin, 1962, 1980; Dally, 1979; Daniel, 1984; Kobayashi, et al, 1973; Chona, 1987).

scholarly journals APPLICATIONS AND ADVANCES OF THE ACTIVE THERMOGRAPHY FOR THE INSPECTION OF COMPOSITE MATERIALS USED IN INDUSTRY

2018 ◽  
Author(s):  
Marcella Grosso ◽  
Sergio D. Soares ◽  
Isabel C. P. Maragarit-Mattos ◽  
Gabriela R. Pereira
Keyword(s):  
Composite Materials ◽  
Active Thermography ◽  
Materials Used

scholarly journals The Effects of Physical Properties of Fibers in Nettle Fiber/Polyester Composites on the Thermal Conductivity Coefficient

2018 ◽  
Vol 1 (1) ◽  
pp. 834-842
Author(s):  
Murat Koru ◽  
Kenan Büyükkaya
Keyword(s):  
Thermal Conductivity ◽  
Composite Materials ◽  
Physical Properties ◽  
Thermal Conductivity Coefficient ◽  
The Black Sea ◽  
Stinging Nettle ◽  
Fiber Concentration ◽  
Black Sea Region ◽  
Polyester Composites ◽  
Materials Used

The physical properties of the materials used are also important in the thermal conduction, besides many other factors. In this study, nettle fiber/polyester composites were formed using stinging nettle grown in the Black Sea region. The stinging nettle fibers used in the formation of these composites were divided into three parts as bottom, middle, and top. The physical properties (diameter, density, crystallinity) of the fibers obtained from different parts of the plant and how the increased fiber concentration affected the thermal conductivity coefficients of the composite materials formed were studied. As a result, it was observed that the thermal conductivity coefficients of the composites increased with the increase of the crystallinity ratio of the fiber. Moreover, the increased fiber concentration significantly increased the thermal conductivity coefficient of the composite materials produced.

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