scholarly journals PULL AND BENDING FORCE CARBON FIBER COMPOSITE

Vortex ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 87
Author(s):  
Moh Ardi Cahyono ◽  
Laura Laksamana
Keyword(s):  
Carbon Fiber ◽  
Tensile Stress ◽  
Test Data ◽  
Modulus Of Elasticity ◽  
Elasticity Modulus ◽  
Fiber Composite ◽  
Average Stress ◽  
Fiber Direction ◽  
Carbon Fiber Composite ◽  
Bending Force

Based on the test data, it can be seen that the average stress value on the carbon fiber composite with the fiber direction of 0 ° -30 ° -60 ° has the highest tensile stress value in the TA 2 specimen, namely 121.439 MPa, the highest strain value in the TA 1 specimen is 0.031, the value The highest modulus of elasticity in the TA 3 specimen is 438,460 MPa, while for the fiber direction 0 ° -45 ° -90 ° the highest tensile stress value in the TB 3 specimen is 670.691 MPa, the highest strain value in the TB 3 specimen is 0.096, the highest elasticity modulus value in the specimen TB1 is 1076,993 MPa.

Investigation of Effect of Non-Uniformities in Unidirectional Carbon Fiber Composite on the Lcr Waves Speed Using Phased Arrays

2015 ◽  
Author(s):  
Vanessa Vieira Gonçalves ◽  
Auteliano Antunes dos Santos ◽  
Paulo Pereira
Keyword(s):  
Carbon Fiber ◽  
Stress Measurement ◽  
Signal To Noise Ratio ◽  
Fiber Composite ◽  
Time Of Flight ◽  
Fiber Direction ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Uniform Region ◽  
Significant Difference

Structural parts benefit on a reliable, nondestructive inspection technique to measure stresses, both applied and residual. Among the candidates, ultrasonic techniques have proven to have enough sensitivity to strain to be employed in service. The way to obtain the stresses is through the measurement of the time-of-flight inside the material and relates it to the strain by acoustoelastic theory or previous measurements. However, stress measurement using ultrasound strongly depends on the uniformity of the material under inspection. In composite materials, the time-of-flight is influenced by microdefects and misalignments in the fibers as well as by the applied strain and temperature. This last factor can be known and controlled, but non uniformities are a characteristic of one particular region or part. Thus, unless employed to a very particular case of a completely uniform region been inspected in a special developed part, UT could not be used to measure stresses in this kind of material without some previous information about it. This work presents an investigation about the effect of non-uniformities in carbon fiber-epoxy pre-preg composites and how to relate them with the time-of-flight of critically refracted longitudinal waves (Lcr) propagating in the fiber direction (main structural direction). A Phased Array System (PAS) with probe of 5 MHz and 64 transducers are employed to generate an image of each part in the region where the Lcr wave travels. The image is created employing the Total Focusing Method (TFM). Two bars of carbon fiber composites with epoxy matrix (HexTow® AS4 / Hexply® 8552) were tested. Five measurement positions are selected, uniformly distributed on the part surface. Statistically significant differences between the parts were found in the time-of-flight for Lcr waves when no stress is applied; even knowing they were manufactured using the same process and materials. The parts were evaluated using the PAS. No difference was found between measurements in the same bar. The parameter chosen to evaluate the non-uniformity was the peak value of the back-wall signal divided by the RMS value of the noise intensity, which was called signal-to-noise ratio (SNR). The results show also significant difference between the SNR of both parts, although with higher dispersion than with Lcr. It can be noticed that there is a correlation between the time-of-flight of Lcr waves and the SNR, indicating that the research could be extended to the development of a new joint technique to be used to measure stresses in composite parts.

Study of Properties of 3D Printed Short Carbon Fiber Composite

2020 ◽  
Vol 841 ◽  
pp. 182-187
Author(s):  
Nathathai Saithongkum ◽  
Karuna Tuchinda
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
3D Printing ◽  
Fiber Composite ◽  
Fiber Direction ◽  
Carbon Fiber Composite ◽  
Short Carbon Fiber ◽  
Printing Technique ◽  
Short Carbon ◽  
3D Printing Technique

The properties of composite materials do not depend only on the properties of raw materials but also other parameters such as volume fraction, geometry, dimension and material distribution etc. Carbon fiber reinforced polymer is one of the top choices of composite material because carbon fiber has light weigh with high tensile strength. For fiber-based composite such as carbon fiber composite, directions of carbon fiber with respect to loading direction could also affect to the strength of composite material under load. In this work, the properties of short carbon fiber-resin composite were investigated (fiber length of 0.2 mm.) with two different fiber orientations, i.e. 0 and 90 degrees to applied load. The 3D printing technique was employed in order to control carbon fiber direction and minimize material loss leading to material cost reduction. It was found that 3D printing technique could control direction of fiber in most case. However, at area with high curvature, the unexpected fiber direction was observed due to post hot process during which material flow was expected. It should also be noted that fiber path during 3D printing process may be very crucial as it could result in low strength local area due to low fiber density. This area could promote stress concentration leading to final fracture.

Prestressed Carbon Fiber Composite Overwrapped Gun Tube

2008 ◽  
Author(s):  
Andrew Littlefield ◽  
Edward Hyland ◽  
Jack Keating
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Carbon Fiber Composite

scholarly journals Lightweight Cellulose/Carbon Fiber Composite Foam for Electromagnetic Interference (EMI) Shielding

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1319 ◽  
Author(s):  
Ran Li ◽  
Huiping Lin ◽  
Piao Lan ◽  
Jie Gao ◽  
Yan Huang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Electromagnetic Interference ◽  
Fiber Composite ◽  
Carbon Fiber Composites ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Carbon Fiber Composite ◽  
Foaming Process ◽  
Long Carbon Fibers

Lightweight electromagnetic interference shielding cellulose foam/carbon fiber composites were prepared by blending cellulose foam solution with carbon fibers and then freeze drying. Two kinds of carbon fiber (diameter of 7 μm) with different lengths were used, short carbon fibers (SCF, L/D = 100) and long carbon fibers (LCF, L/D = 300). It was observed that SCFs and LCFs built efficient network structures during the foaming process. Furthermore, the foaming process significantly increased the specific electromagnetic interference shielding effectiveness from 10 to 60 dB. In addition, cellulose/carbon fiber composite foams possessed good mechanical properties and low thermal conductivity of 0.021–0.046 W/(m·K).

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