scholarly journals A Comprehensive Report on Ultrasonic Attenuation of Engineering Materials, Including Metals, Ceramics, Polymers, Fiber-Reinforced Composites, Wood, and Rocks

2020 ◽  
Vol 10 (7) ◽  
pp. 2230 ◽  
Author(s):  
Kanji Ono
Keyword(s):  
Rayleigh Scattering ◽  
Ultrasonic Attenuation ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Test Results ◽  
Fiber Reinforced ◽  
Materials Selection ◽  
Linear Frequency ◽  
Engineering Materials ◽  
Non Destructive

In this paper, ultrasonic attenuation of engineering materials is evaluated comprehensively, covering metals, ceramics, polymers, fiber-reinforced composites, wood, and rocks. After verifying two reliable experimental methods, 336 measurements are conducted and their results are tabulated. Attenuation behavior is determined over broadband spectra, extending up to 15 MHz in low attenuating materials. The attenuation spectra are characterized in combination with four power law terms, with many showing linear frequency dependence, with or without Rayleigh scattering. Dislocation damping effects are re-evaluated and a new mechanism is proposed to explain some of the linear frequency dependencies. Additionally, quadratic and cubic dependencies due to Datta–Kinra scattering and Biwa scattering, respectively, are used for some materials to construct model relations. From many test results, some previously hidden behaviors emerged upon data evaluation. Effects of cold working, tempering, and annealing are complex and sometimes contradictory. Comparison to available literature was attempted for some, but most often prior data were unavailable. This collection of new attenuation data will be of value in materials selection and in designing structural health monitoring and non-destructive inspection protocols.

scholarly journals EFFECTS OF POROSITY ON ULTRASONIC CHARACTERISTIC PARAMETERS AND MECHANICAL PROPERTIES OF GLASS FIBER REINFORCED COMPOSITES

2012 ◽  
Vol 06 ◽  
pp. 646-651 ◽  
Author(s):  
Wen Ma ◽  
Fushun Liu
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Attenuation ◽  
Ultrasonic Inspection ◽  
Fiber Reinforced Composites ◽  
Metallographic Analysis ◽  
Void Content ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Characteristic Parameters ◽  
Distribution Shape

Voids are inevitable in the fabrication of fiber reinforced composites and have a detrimental impact on mechanical properties of composites. Different void contents were acquired by applying different vacuum bag pressures. Ultrasonic inspection and ablation density method were adopted to measure the ultrasonic characteristic parameters and average porosity, the characterization of voids' distribution, shape and size were carried out through metallographic analysis. Effects of void content on the tensile, flexural and interlaminar shear properties and the ultrasonic characteristic parameters were discussed. The results showed that, as vacuum bag pressure went from -50kPa to -98kPa, the voids content decreased from 4.36 to 0.34, the ultrasonic attenuation coefficient decreased, but the mechanical strengths all increased.

Application of Fiber Reinforced Composites for Sports Instruments

2014 ◽  
Vol 687-691 ◽  
pp. 4256-4259 ◽  
Author(s):  
Dong Hai Su
Keyword(s):  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Materials Selection ◽  
Composites Materials

The application of fiber reinforced composites for sports instruments is introduced. The advantage of fiber reinforced composites, materials selection, products varieties, examples and status of application for sports instruments are discussed.

Stress-strain behavior of carbon filament yarns under high strain rates

2012 ◽  
Vol 82 (7) ◽  
pp. 685-699 ◽  
Author(s):  
Ayham Younes ◽  
Vignaesh Sankaran ◽  
André Seidel ◽  
Martin Waldmann ◽  
Chokri Cherif ◽  
...  
Keyword(s):  
High Speed ◽  
Test Method ◽  
Fiber Reinforced Composites ◽  
Impact Loads ◽  
Strain Rates ◽  
Reinforced Composites ◽  
Test Results ◽  
Fiber Reinforced ◽  
Carbon Filament ◽  
Extreme Stress

Fiber-reinforced composites used in numerous technical applications have to meet the ever increasing safety requirements. Resistance to extreme stress under high velocity impact loads assumes even greater significance. Previous studies on the behavior of fiber-reinforced composites under impact loads provide little insight about the properties of filament yarns, a basis for many composite applications. Hence this paper focuses on the development of a suitable test method for performing high speed tensile tests on all filament yarn types, and the acquisition and analysis of the test results. This will enable the derivation of material models for their usage in the field of composites applications. Initially, the widely used carbon fiber filament yarns have been tested. The conclusive test results with a reduced yarn clamp mass and high stiffness of the test apparatus indicate that tensile strength and modulus of elasticity of carbon filament yarns increase with higher strain rates.

Defect Types and Ultrasonic Nondestructive Testing for Fiber-Reinforced Composites

2013 ◽  
Vol 834-836 ◽  
pp. 233-236
Author(s):  
Lin Dong Liu ◽  
Xiao Qing Wu
Keyword(s):  
Failure Modes ◽  
Fiber Reinforced Composites ◽  
Fracture Mechanisms ◽  
Reinforced Composites ◽  
Non Destructive Testing ◽  
Fiber Reinforced ◽  
Destructive Testing ◽  
The Common ◽  
Non Destructive ◽  
Ultrasonic Ndt

In this paper, an attempt is made to introduce the defect types relevant to ultrasonic non-destructive testing, and then, we explain how these defects generate in fiber-reinforced composites. The common failure modes which occur are described and discussed. The significance of each of the fracture mechanisms, in terms of their effects on the residual load-bearing properties, is considered. The second part describes briefly the main relevant ultrasonic NDT methods used to identify these defects and indicates the sensitivity to the different types of defect.

Application of Fiber- Reinforced Composites for Sports Instruments

2013 ◽  
Vol 641-642 ◽  
pp. 329-332
Author(s):  
Bo Qiang Shi ◽  
Yun Tao Cai
Keyword(s):  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Materials Selection ◽  
Composites Materials

Fiber- reinforced composites have been applied extensively not only in aero-space, automobile and other industries, but also in sports instruments. The application of fiber- reinforced composites for sports instruments is introduced. The advantage of fiber rein-forced composites, materials selection, products varieties, examples and status of application for sports instruments are discussed.

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