Coefficient of thermal expansion evolution for cryogenic preconditioned hybrid carbon fiber/glass fiber-reinforced polymeric composite materials

2012 ◽  
Vol 112 (3) ◽  
pp. 1245-1251 ◽  
Author(s):  
D. Luca Motoc ◽  
J. Ivens ◽  
N. Dadirlat
Keyword(s):  
Thermal Expansion ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Coefficient Of Thermal Expansion ◽  
Polymeric Composite ◽  
Fiber Glass ◽  
Polymeric Composite Materials ◽  
Glass Fiber Reinforced ◽  
Hybrid Carbon

RESEARCH OF POSSIBILITY OF APPLICATION OF FIREPROOF PASTE FOR INCREASE OF FIRE SAFETY OF DESIGNS FROM POLYMERIC COMPOSITE MATERIALS

2021 ◽  
pp. 67-75
Author(s):  
M.A. Venediktova ◽  
◽  
A.A. Evdokimov ◽  
L.L. Krasnov ◽  
A.P. Petrova ◽  
...  
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Glass Fibre ◽  
Fire Safety ◽  
Polymeric Composite ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Polymeric Composite Materials ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Possibility of increase of fire safety of VPS-58 glass fibre plastics and carbon fiber-reinforced plastic the VKU-51 brands by putting fireproof swelling-up fireproof paste of the VZO-9kh brand is investigated. Complex researches of physicomechanical, fire and heatphysical properties of fireproof paste of the VZO-9kh brand are conducted. By results of researches it is established that fireproof paste of the VZO-9kh brand corresponds to qualifying standards and can be applied to increase of fire safety of designs from polymeric composite materials.

Detection of Delamination in GFRP and CFRP by Microwaves with Focusing Mirror Sensor

2013 ◽  
Vol 750 ◽  
pp. 142-146 ◽  
Author(s):  
Atsushi Hosoi ◽  
Yuhei Yamaguchi ◽  
Yang Ju ◽  
Yasumoto Sato ◽  
Tsunaji Kitayama
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
High Sensitivity ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Plastic ◽  
Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic

A technique to detect delamination in composite materials by noncontact, rapid and high sensitive microwave reflectometry with a focusing mirror sensor was proposed. The focusing mirror sensor, which has high sensitivity and resolution, is expected to detect delamination sensitively. In this paper, the ability of microwave inspection to detect delamination in glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP) was verified. As the results, the existences of 100 μm thick delamination in 3 mm thick GFRP laminate and 2 mm thick CFRP laminate were detected.

Friction and Wearing Behaviour of Sintered Composites Made from Copper Mixed with Carbon Fibers

2015 ◽  
Vol 660 ◽  
pp. 81-85 ◽  
Author(s):  
Radu Caliman
Keyword(s):  
Thermal Conductivity ◽  
Thermal Expansion ◽  
Composite Materials ◽  
Friction Coefficient ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Coefficient Of Thermal Expansion ◽  
Density Ratio ◽  
Point Of View ◽  
Short Carbon

This paper presents a study regarding friction and wear comportment of sintered composite materials obtained by mixture of copper with short carbon fibers. Sintered composites are gaining importance because the reinforcement serves to reduce the coefficient of thermal expansion and increase the strength and modulus. In case of composites form by carbon fiber and copper, the thermal conductivity can also be enhanced. The combination of low thermal expansion and high thermal conductivity makes them very attractive for electronic packaging. Besides good thermal properties, their low density makes them particularly desirable for aerospace electronics and orbiting space structures. Compared to the metal itself, a carbon fiber-copper composite is characterized by a higher strength-to-density ratio, a higher modulus-to-density ratio, better fatigue resistance, better high-temperature mechanical properties and better wear resistance. Varying the percentage of short carbon fibers from 7,8% to 2,4%, and the percentage of copper from 92,2% to 97,6%, five dissimilar composite materials have been made and tested from the wear point of view. Friction tests are carried out, at room temperature, in dry conditions, on a pin-on-disc machine. The friction coefficient was measured using abrasive discs made from steel 4340 having the average hardness of 40 HRC, and sliding velocity of 0,6 m/sec. The primary goal of this study work it was to distinguish a mixture of materials with enhanced friction and wearing behaviour. The load applied on the specimen during the tests, is playing a very important role regarding friction coefficient and also the wearing speed.

scholarly journals A method of manufactoring pipes from polymer composite materials for aircraft structures

2020 ◽  
Vol 26 (5) ◽  
pp. 228-27
Author(s):  
S.O. Odaisky ◽  
◽  
O.M. Potapov ◽  
S.V. Fedorenko ◽  
A.P. Shchudro ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
Modulus Of Elasticity ◽  
Coefficient Of Thermal Expansion ◽  
Longitudinal Direction ◽  
Polymer Composite Materials ◽  
Thermophysical Characteristics ◽  
Reinforcement Scheme

The frame power structures are widely applied when designing aircraft, in which composite rod elements are used to reduce the mass and size characteristics. To solve the problem of manufacturing rod elements from polymer composite materials, we developed a technology for the manufacture of carbon fiber pipes using an existing machine for winding carbon fiber, which provides the necessary strength and rigidity mainly in the longitudinal direction.When calculating the rod elements, all the loads that will affect the structure as well as the coefficient of thermal expansion should be taken into account. To achieve the required physical, mechanical, and thermophysical characteristics, the optimal scheme of reinforcement is the scheme with a quasi-longitudinal direction of the fibers. We developed the method of manufacturing based on the technology allowing us to obtain a reinforcement scheme with fiber orientation in the quasi-longitudinal direction with a reinforcement angle of about 1° by a combined method of layer-by-layer winding of carbon fiber. As a result of technological testing, we obtained samples of carbon fiber rod elements, which were used to confirm the calculated characteristics. To confirm the physico-mechanical and thermophysical characteristics, we determined the assessment of limit of strength and modulus of elasticity in bending, the limit of strength and modulus of elasticity in torsion, the limit of strength and modulus of elasticity in compression, and the coefficient of thermal expansion. The obtained characteristics of the dependences of the elasticity modulus of the pipe prototype material at the fibers’ orientation angle correlate with theoretical calculations. The presented method has the patent UA 128613 U.

Sizing Extreme Environmental Condition Influences on the Multiphase Polymeric Composites’ CTE

2011 ◽  
Author(s):  
Petru A. Pop ◽  
Dana Luca-Motoc ◽  
Gheorghe Bejinaru-Mihoc
Keyword(s):  
Composite Materials ◽  
Environmental Conditions ◽  
Coefficient Of Thermal Expansion ◽  
Polymeric Composite ◽  
Research Area ◽  
Polymeric Composite Materials ◽  
Wide Range ◽  
Engineering Team ◽  
Extreme Environmental Condition ◽  
Management Issues

The coefficient of thermal expansion (CTE) of multiphase polymeric composite materials represents an important role in the process of engineered materials design, especially while approaching thermal management issues. Tailoring and designing material combinations in order to develop a composite structure to prove stability over a wide range of temperatures, from cryogenic to high values, to withstand extreme environmental conditions is the dream and the purpose of any engineering team involved in such study/research area. The paper aims to approach and to present the variations of the CTE with extreme environmental conditions (e.g. cryogenic, desert and hygroscopic conditioning) for particular combinations of particle-fibers multiphase polymeric composite materials. Influencing factors will be underlined to accompany the experimental research.

Multiphase Finite Element Modeling of Machining Unidirectional Composites: Prediction of Debonding and Fiber Damage

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
Chinmaya R. Dandekar ◽  
Yung C. Shin
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Cutting Force ◽  
Fiber Orientation ◽  
Brittle Failure ◽  
Interfacial Layer ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced

A multiphase finite element model using the commercial finite element package ABAQUS/EXPLICIT is developed for simulating the orthogonal machining of unidirectional fiber reinforced composite materials. The composite materials considered for this study are a glass fiber reinforced epoxy and a tube formed carbon fiber reinforced epoxy. The effects of varying the fiber orientation angle and tool rake angle on the cutting force and damage during machining are considered for the glass fiber reinforced epoxy. In the case of carbon fiber reinforced epoxy, only the effect of fiber orientation on the measured cutting force and damage during machining is considered. Two major damage phenomena are predicted: debonding at the fiber-matrix interface and fiber pullout. In the multiphase approach, the fiber and matrix are modeled as continuum elements with isotropic properties separated by an interfacial layer, while the tool is modeled as a rigid body. The cohesive zone modeling approach is used for the interfacial layer to simulate the extent of debonding below the work surface. Bulk deformation and shear failure are considered in the matrix for both the models and the glass fiber. A brittle failure criterion is used for the carbon fiber specimen and is coded in FORTRAN as a user defined material (VUMAT). The brittle failure of the carbon fibers is modeled using the Marigo model for brittle failure. For validation purposes, simulation results of the multiphase approach are compared with experimental measurements of the cutting force and damage. The model is successful in predicting cutting forces and damage at the front and rear faces with respect to the fiber orientation. A successful prediction of fiber pullout is also demonstrated in this paper.

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