An investigation of the relationship between contrast and azimuthal angle for imaging porosity in graphite/epoxy composites with ultrasonic polar backscatter

1993 ◽  
Vol 26 (5) ◽  
pp. 266-267
Keyword(s):  
Azimuthal Angle ◽  
Epoxy Composites ◽  
The Relationship

scholarly journals Investigation of Angular Spectrum of Scattered Inert Gas Ions from the InGaP (001) Surface

2021 ◽  
Vol 22 (4) ◽  
pp. 742-745
Author(s):  
M.K. Karimov ◽  
U.O. Kutliev ◽  
S.B. Bobojonova ◽  
K.U. Otabaeva
Keyword(s):  
Azimuthal Angle ◽  
Angular Spectrum ◽  
Inert Gas ◽  
Angle Of Incidence ◽  
Surface Studies ◽  
Spatial Variables ◽  
The Relationship ◽  
Focusing Properties ◽  
Scattered Beam

It has been shown that this method is quite suitable for surface studies and diagnostics of many component materials. The values of the azimuthal angle of distribution of Ne, Ar and Xe ions scattered from InGaP (001) <110> are obtained. The relationship between the spatial variables of the scattered beam (mainly azimuthal angular spectra) and the type of ions has been established. The correlation between focusing properties of surface semichannel with a type of bombardment ion at the different angle of incidence has been shown.    

scholarly journals Numerical method for the prediction of bending properties of glass-epoxy composites

2007 ◽  
pp. 85-95
Author(s):  
Marina Stamenovic ◽  
Slavisa Putic ◽  
Branislav Bajceta ◽  
Dragana Vitkovic
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Numerical Model ◽  
Outer Layer ◽  
Mechanical Test ◽  
Epoxy Composites ◽  
Future Research ◽  
Structural Components ◽  
Bending Properties ◽  
The Relationship

Mechanical properties of composite materials are conditioned by their structure and depend on the characteristics of structural components. In this paper is presented a numerical model by which the bending properties can be predicted on the basis of known mechanical properties of tension and pressure. Determining the relationship between these properties is justified having in mind the mechanics of fracture during bending, where the fracture takes place on the outer layer which is subjected to bending while the break ends on the layer subjected to pressure. The paper gives the values of tension, pressure and bending properties obtained by the corresponding mechanical test. A comparison of the numerical results of bending properties obtained on the basis of the model with the experimental ones, shows their satisfactory agreement. Therefore, this model can be used for some future research to predict bending properties without experiments.

scholarly journals A Study on Interfacial Shear Strength of GF/EPOXY Composites by Means of Microbond Tests

1996 ◽  
Vol 5 (4) ◽  
pp. 096369359600500 ◽  
Author(s):  
Fang Ming Zhao ◽  
Nobuo Takeda ◽  
Koichi Inagaki ◽  
Nobuo Ikuta
Keyword(s):  
Shear Strength ◽  
Systematic Study ◽  
Glass Fibre ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Epoxy Composites ◽  
Silane Treatment ◽  
The Relationship

A systematic study has been conducted to investigate the influence of silane treatment on the interfacial shear strength of glass fibre/epoxy composites by means of microbond tests, and to clarify the relationship between the interphase consisting of physisorbed and chemisorbed silanes on glass fibre surfaces and the corresponding interfacial shear strength.

Influence of Cutting Parameters and Tool Geometry on Cutting Forces and Damage on 2D and 3D Carbon/Epoxy Composites in Drilling

2014 ◽  
Vol 611-612 ◽  
pp. 1217-1225 ◽  
Author(s):  
Yosra Turki ◽  
Malek Habak ◽  
Raphael Velasco ◽  
Pascal Vantomme ◽  
Kamel Khellil
Keyword(s):  
Cutting Forces ◽  
Thrust Force ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Epoxy Composites ◽  
Tool Geometry ◽  
Machining Conditions ◽  
Force Moment ◽  
2D And 3D ◽  
The Relationship

The evolution of carbon/epoxy composites use in aeronautics requires a better comprehension of the machining conditions influence on these materials. This study aim is to establish, based on the experimentation, the relationship between machining conditions and the behavior of drilled 2D and 3D carbon/epoxy composites. Two drill geometries, seam introducing and a range of cutting speed and feed have been tested. The effect of each parameter has been assessed in terms of thrust force, moment (recorded during machining) and defects (performed by macroscopic analyses and quantified using delamination factor Fd). Experimental results have shown significant influences of feed and drill geometry on delamination reduction. The use of a spur drill and a low feed generates minor defects and produces the best results. Furthermore, stitching helps reduce damage inside the hole.

Influence of pyrolytic thermal history on olive pruning biochar and related epoxy composites mechanical properties

2019 ◽  
Vol 54 (14) ◽  
pp. 1863-1873 ◽  
Author(s):  
Mattia Bartoli ◽  
Muhammad Abid Nasir ◽  
Pravin Jagdale ◽  
Elisa Passaglia ◽  
Roberto Spiniello ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal History ◽  
Morphological Analysis ◽  
Epoxy Composites ◽  
Heating Rates ◽  
History Of ◽  
Olive Cultivation ◽  
The Relationship ◽  
High Treatment ◽  
Properties Of Composites

Olive pruning is waste from olive cultivation and is generally disposed of through incineration. Olive pruning can, however, be salvaged by pyrolysis, which also produces an interesting carbon-based material known as biochar. Biochar has been proved as a suitable filler which improves the mechanical properties of epoxy composites. Despite this, literature has few studied focused on the relationship between biochar thermal history and the properties it induces in related biochar containing composites. In this work, we report a morphological analysis of biochar produced at different pyrolytic high treatment temperatures (400℃, 600℃, 800℃, and 1000℃) using different heating rates (5℃/min, 15℃/min, and 50℃/min). We investigate the effect of different biochar morphology on the biochar epoxy-related composites, proving the tuneability of the mechanical properties of composites according to the thermal history of the biochar employed.

scholarly journals An Extended Thickness-Dependent Moisture Absorption Model for Unidirectional Carbon/Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 440
Author(s):  
Azisyahirah Azizan ◽  
Mahzan Johar ◽  
Salvinder Singh Karam Singh ◽  
Shahrum Abdullah ◽  
Seyed Saeid Rahimian Koloor ◽  
...  
Keyword(s):  
Moisture Content ◽  
Weibull Distribution ◽  
Moisture Absorption ◽  
Epoxy Composites ◽  
Long Period ◽  
Content Ratio ◽  
Dependent Model ◽  
The Relationship ◽  
Maximum Moisture Content ◽  
Upper Boundary

Moisture absorption tests for materials that exhibit non-Fickian behavior generally require a relatively long period to reach saturation. Therefore, it would be beneficial to establish a relationship between the moisture content and the thickness to minimize the experimental time and cost. This research characterizes the moisture absorption behavior of AS4/8552 carbon/epoxy composites. Specimens were prepared at 4, 8, and 16 plies and immersed in distilled water at 60 °C. The relationship between the non-Fickian parameters (Fickian to non-Fickian maximum moisture content ratio ϕ, non-Fickian diffusivity per square thickness α, and non-Fickian initiation time to) and thickness was characterized using a thickness-dependent model. A comparison with other materials revealed that all three non-Fickian parameters are able to be fitted using a power law. Nevertheless, the upper boundary for the applicability of this model was not determined in this study. The Weibull distribution plots indicate that the probability of non-Fickian moisture absorption is influenced by ϕ and α at approximately 62% within a normalized thickness range of 2–3. In regards to to, it is 82% at a normalized thickness of 6. Therefore, the Weibull distribution is proposed for the assessment of non-Fickian moisture absorption based on the material’s thickness.

scholarly journals Study Effect of Silver Oxide Addition on Mechanical Properties of Epoxy Composites

2018 ◽  
Vol 3 (7) ◽  
pp. 38 ◽  
Author(s):  
Ismail Ibrahim Marhoon ◽  
Dalia Adil Rasool ◽  
Kawther Ali Dhumad ◽  
Younis Swadi Tlaiaa ◽  
Mohammed Ali Abdulrehman
Keyword(s):  
Mechanical Properties ◽  
Applied Load ◽  
Silver Oxide ◽  
Volume Fraction ◽  
Wear Test ◽  
Epoxy Composites ◽  
Oxide Addition ◽  
Before And After ◽  
Relationship Of ◽  
The Relationship

This study included the preparation of specimens of epoxy reinforced by silver oxide. Some of their mechanical properties been studied such as hardness, compression strength and wear rate with volume fraction 2%,4%,6%. The results showed that the mechanical properties hardness and compressive were affected directly by the increase of the volume fraction of the reinforcement material. The samples with the highest volume fraction had the highest hardness and compressive strength. As for the wear test was conducted in the circumstances of changing the applied load 40,60,80 N were approved, respectively, results shown that the rate of wear increases with load increasing of all samples before and after the reinforcement. For the relationship of the rate of wear with the increasing of the volume fraction, the results showed that there is a decrease in the rate of wear with the increasing of the volume fraction.

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