scholarly journals The Effect of Selected Operational Factors on the Vibroactivity of Upper Gearbox Housings Made of Composite Materials

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4240 ◽  
Author(s):  
Figlus ◽  
Kozioł ◽  
Kuczyński
Keyword(s):  
Composite Materials ◽  
Rotational Speed ◽  
Fiber Reinforced Polymer ◽  
Measuring System ◽  
Directional Microphone ◽  
Reinforced Polymer ◽  
Reinforcing Fibers ◽  
Data Acquisition Card ◽  
Vibration Tests ◽  
Toothed Gears

This paper presents the results of laboratory tests in which evaluation was performed regarding the effect of selected operating factors on the vibroactivity of upper gearbox housings made of three different fiber reinforced polymer composite materials with diverse layouts (cross and random) and types of reinforcing fibers: glass fiber and carbon fiber. The results of tests for composite housings were compared with those for a steel housing. The tests showed that composite housings had a weight lower by more than 60% compared to the steel housing. A multisensor measuring system consisting of vibration acceleration transducers, a directional microphone and a data acquisition card with software was used for the study. Tests of the vibroactivity of upper gear housings were carried out at different loads and rotational speeds of toothed gears. The study showed that composite housings are less sensitive to changes in the rotational speed that steel housings. The tests showed that at a higher rotational speed of the gear transmission, housings made of composite materials had a comparable or lower level of vibration. Tests and analyses of the vibroactivity of housings performed at different loads of the gear allow the conclusion that composite housings, despite a considerably lower weight than steel housings, are less sensitive to changes in the load of the gearing.

scholarly journals High-Speed Time- and Frequency-Domain Terahertz Tomography of Glass-Fiber-Reinforced Polymer Laminates with Internal Defects

2021 ◽  
Vol 11 (11) ◽  
pp. 4933
Author(s):  
Ji-Sang Yahng ◽  
Dae-Su Yee
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
High Speed ◽  
Nondestructive Inspection ◽  
Fiber Reinforced Polymer ◽  
Glass Fiber Reinforced Polymer ◽  
Tomographic Images ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Thz Tomography

Composite materials are increasingly being utilized in many products, such as aircrafts, wind blades, etc. Accordingly, the need for nondestructive inspection of composite materials is increasing and technologies that allow nondestructive inspection are being studied. Existing ultrasound methods are limited in their ability to detect defects due to high attenuation in composite materials, and radiographic examination methods could pose a danger to human health. Terahertz (THz) wave technology is an emerging approach that is useful for imaging of concealed objects or internal structures due to high transmittance in non-conductive materials, straightness, and safety to human health. Using high-speed THz tomography systems that we developed, we have obtained THz tomographic images of glass-fiber-reinforced polymer (GFRP) laminates with artificial internal defects such as delamination and inclusion. The defects have various thicknesses and sizes, and lie at different depths. We present THz tomographic images of GFRP samples to demonstrate the extent to which the defects can be detected with the THz tomography systems.

Applications and Advantages of Basalt Assembly in Construction Industry

2011 ◽  
Vol 332-334 ◽  
pp. 1937-1940 ◽  
Author(s):  
Wei Wei Hu ◽  
Hua Wu Liu ◽  
Dang Feng Zhao ◽  
Zong Bin Yang
Keyword(s):  
Construction Industry ◽  
High Performance ◽  
Inorganic Material ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Chemical Compositions ◽  
Basalt Fibers ◽  
Reinforced Polymer ◽  
Reinforcing Fibers ◽  
Reinforcement Material

Basalt fiber is a novel high-performance inorganic material, recently has been well received as a reinforcement in China. However, the applications in civil engineering have been rather limited. The chemical compositions, the characteristics of basalt fibers, and the typical products of basalt, including chopped yarn of basalt fiber, basalt fiber geo-textiles and basalt fiber reinforced polymer, were introduced．The advantages of basalt fibers as a reinforcement of concrete were explored in comparison with the commonly used reinforcing fibers, which indicates that basalt fiber is the most promising reinforcement material for concrete and will significantly benefit civil construction industries in the future.

scholarly journals Fiber-Reinforced Polymer Composites: Manufacturing, Properties, and Applications

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1667 ◽  
Author(s):  
Dipen Rajak ◽  
Durgesh Pagar ◽  
Pradeep Menezes ◽  
Emanoil Linul
Keyword(s):  
Composite Materials ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Diverse Range ◽  
Promising Alternative ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Reinforced Polymer ◽  
Manufacturing Techniques

Composites have been found to be the most promising and discerning material available in this century. Presently, composites reinforced with fibers of synthetic or natural materials are gaining more importance as demands for lightweight materials with high strength for specific applications are growing in the market. Fiber-reinforced polymer composite offers not only high strength to weight ratio, but also reveals exceptional properties such as high durability; stiffness; damping property; flexural strength; and resistance to corrosion, wear, impact, and fire. These wide ranges of diverse features have led composite materials to find applications in mechanical, construction, aerospace, automobile, biomedical, marine, and many other manufacturing industries. Performance of composite materials predominantly depends on their constituent elements and manufacturing techniques, therefore, functional properties of various fibers available worldwide, their classifications, and the manufacturing techniques used to fabricate the composite materials need to be studied in order to figure out the optimized characteristic of the material for the desired application. An overview of a diverse range of fibers, their properties, functionality, classification, and various fiber composite manufacturing techniques is presented to discover the optimized fiber-reinforced composite material for significant applications. Their exceptional performance in the numerous fields of applications have made fiber-reinforced composite materials a promising alternative over solitary metals or alloys.

scholarly journals Conceptual Design of Composite Sandwich Structure Submarine Radome

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1966 ◽  
Author(s):  
Waqas ◽  
Shi ◽  
Imran ◽  
Khan ◽  
Tong ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Materials ◽  
Conceptual Design ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
The Core ◽  
Reinforced Polymer ◽  
Sandwich Core

Radomes are usually constructed from sandwich structures made of materials which usually have a low dielectric constant so that they do not interfere with electromagnetic waves. Performance of the antenna is increased by the appropriate assortment of materials enabling it to survive under marine applications, and it depends on composite strength-to-weight ratio, stiffness, and resistance to corrosion. The design of a sandwich core submarine radome greatly depends on the material system, number of layers, orientation angles, and thickness of the core material. In this paper, a conceptual design study for a sandwich core submarine radome is carried out with the help of finite element analysis (FEA) using two unidirectional composite materials—glass fiber reinforced polymer (GFRP) and carbon fiber reinforced polymer (CFRP)—as a skin material and six different core materials. Conceptual designs are obtained based on constraints on the composite materials’ failure, buckling, and strength. The thickness of the core is reduced under constraints on material and buckling strength. Finite element analysis software ANSYS WORKBENCH is used to carry out all the simulations.

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