Fracture Mechanisms in Fiber Reinforced Polymer Matrix Composites

2014 ◽  
Vol 1611 ◽  
pp. 153-158
Author(s):  
C. Rodríguez ◽  
M. Hinojosa ◽  
J. Aldaco ◽  
A. Cázares
Keyword(s):  
Carbon Fibers ◽  
Matrix Composite ◽  
Polymer Matrix ◽  
Epoxy Matrix ◽  
Polymer Matrix Composites ◽  
Glass Fibers ◽  
Fracture Mechanisms ◽  
Matrix Composites ◽  
Polyester Matrix ◽  
Epoxy Matrix Composite

ABSTRACTIn this work we report the fractographic study of polymer matrix composites specimens reinforced with glass and carbon fibers. Specimens of a polyester matrix composite with 30% of E-glass fibers are prepared and fractured in flexure mode. We also test an epoxy matrix composite with 30% carbon fibers, which is fractured in flexure mode. All specimens are manufactured based on the D790 ASTM standard for bending mode at room temperature. As an exception, the composites with epoxy matrix and reinforced with carbon fiber are cured in an autoclave. The most commonly observed fracture mechanisms are debonding in the interphase, delamination, Chevron lines, microbuckling, river patterns and radial fracture on the fibers.

scholarly journals Plasma Nanocoatings Developed to Control the Shear Strength of Polymer Composites

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1188 ◽  
Author(s):  
Zvonek ◽  
Sirjovova ◽  
Branecky ◽  
Plichta ◽  
Skacel ◽  
...  
Keyword(s):  
Shear Strength ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Glass Fibers ◽  
Matrix Composites ◽  
Suitable Material ◽  
Oxygen Fraction ◽  
Short Beam ◽  
Beam Shear ◽  
Polyester Composite

All reinforcements for polymer-matrix composites must be coated with a suitable material in the form of a thin film to improve compatibility and interfacial adhesion between the reinforcement and the polymer matrix. In this study, plasma nanotechnology was used to synthetize such functional nanocoatings using pure tetravinylsilane (TVS) and its mixtures with oxygen gas (O2) as precursors. The plasma-coated glass fibers (GFs) were unidirectionally embedded in a polyester resin to produce short composite beams that were analyzed by a short-beam-shear test to determine the shear strength characterizing the functionality of the nanocoatings in a GF/polyester composite. The developed plasma nanocoatings allowed controlling the shear strength between 26.2–44.1 MPa depending on deposition conditions, i.e., the radiofrequency (RF) power and the oxygen fraction in the TVS/O2 mixture. This range of shear strength appears to be sufficiently broad to be used in the design of composites.

A process to recover carbon fibers from polymer-matrix composites in end-of-life vehicles

JOM ◽  
2004 ◽  
Vol 56 (8) ◽  
pp. 43-47 ◽  
Author(s):  
Bassam J. Jody ◽  
Joseph A. Pomykala ◽  
Edward J. Daniels ◽  
Jessica L. Greminger
Keyword(s):  
End Of Life ◽  
Carbon Fibers ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Matrix Composites

scholarly journals A Review of Prestressed Fibre-Reinforced Polymer Matrix Composites

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 60
Author(s):  
Raphael Olabanji Ogunleye ◽  
Sona Rusnakova
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Residual Stresses ◽  
Matrix Composite ◽  
Polymer Matrix ◽  
Moisture Absorption ◽  
Polymer Matrix Composites ◽  
Great Influence ◽  
Polymer Matrix Composite ◽  
Matrix Composites

This review examines various studies on reducing tensile stresses generated in a polymer matrix composite without increasing the mass or dimension of the material. The sources of residual stresses and their impacts on the developed composite were identified, and the different techniques used in limiting residual stresses were also discussed. Furthermore, the review elaborates on fibre-prestressing techniques based on elastically (EPPMC) and viscoelastically (VPPMC) prestressed polymer matrix composites, while advantages and limitations associated with EPPMC and VPPMC methods are also explained. The report shows that tensile residual stresses are induced in a polymer matrix composite during production as a result of unequal expansion, moisture absorption and chemical shrinkage; their manifestations have detrimental effects on the mechanical properties of the polymer composite. Both EPPMC and VPPMC have great influence in reducing residual stresses in the polymer matrix and thereby improving the mechanical properties of composite materials. The reports from this study provide some basis for selecting a suitable technique for prestressing as well as measuring residual stresses in composite materials.

scholarly journals UV Sensor Based on Fiber Bragg Grating Covered with Graphene Oxide Embedded in Composite Materials

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5468
Author(s):  
Piotr Lesiak ◽  
Karolina Bednarska ◽  
Krzysztof Małkowski ◽  
Łukasz Kozłowski ◽  
Anna Wróblewska ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Epoxy Resin ◽  
Fiber Bragg Grating ◽  
Uv Radiation ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Glass Fibers ◽  
Fiber Optic Sensor ◽  
Bragg Grating ◽  
Matrix Composites

Polymer–matrix composites degrade under the influence of UV radiation in the range of the 290–400 nm band. The degradation of polymer–matrix composites exposed to UV radiation is characterized by extensive aging of the epoxy matrix, resulting in deterioration of their mechanical properties. Glass fibers/epoxy resin composites were made by an out-of-autoclave method whereas a fiber optic sensor was placed between different layers of laminates. In our work, we used a fiber Bragg grating sensor covered with graphene oxide and embedded in a polymer matrix composite to monitor UV radiation intensity. Measurements of UV radiation may allow monitoring the aging process of individual components of the polymer composite. In order to estimate the number of microcracks of epoxy resin, microstructure observations were carried out using a scanning electron microscope.

Strain sensing using carbon fiber

1999 ◽  
Vol 14 (3) ◽  
pp. 790-802 ◽  
Author(s):  
Xiaojun Wang ◽  
Xuli Fu ◽  
D. D. L. Chung
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Matrix Composite ◽  
Epoxy Matrix ◽  
Strain Sensors ◽  
Cement Matrix ◽  
Strain Sensing ◽  
Fractional Change ◽  
Epoxy Matrix Composite ◽  
Short Carbon

Carbon fiber provides strain sensing through change in electrical resistance upon strain. Due to piezoresistivity of various origins, a single carbon fiber in epoxy, an epoxy-matrix composite with short carbon fibers (5.5 vol%), a cement-matrix composite with short carbon fibers (0.2–0.5 vol%), and an epoxy-matrix composite with continuous carbon fibers (58 vol%) are strain sensors with fractional change in resistance per unit strain up to 625. A single bare carbon fiber is not piezoresistive, but just resistive.

scholarly journals Degree of Conversion of Polymer-matrix Composite assessed by FTIR Analysis

2013 ◽  
Vol 14 (1) ◽  
pp. 76-79 ◽  
Author(s):  
Mateus Rodrigues Tonetto ◽  
Marcelo Ferrarezi de Andrade ◽  
Shelon Cristina Souza Pinto ◽  
Alvaro Henrique Borges ◽  
Matheus Coelho Bandéca ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Polymer Matrix Composite ◽  
Degree Of Conversion ◽  
Matrix Composites ◽  
Ftir Analysis ◽  
Light Curing ◽  
Post Hoc ◽  
Storage Times

ABSTRACT Aims and objectives The behavior of polymer-matrix composite is dependent on the degree of conversion. The aim of this study was to evaluate the degree of conversion of two resin cements following storage at 37°C immediately, 24 and 48 hours, and 7 days after light-curing by FTIR analysis. Materials and methods The specimens were made in a metallic mold and cured with blue LED with power density of 500 mW/ cm2 for 30 seconds. The specimens were pulverized, pressed with KBr and analyzed with FTIR following storage times. Statistical analysis used ANOVA (two-way) and Tukey's post hoc. Results To the polymer-matrix composites between 24 and 48 hours does not show a significant increase (p > 0.05), however, the highest values were found after 7 days. Conclusion The polymer-matrix composites used in this study showed similarity on the degree of conversion and increased of according to the time of storage. How to cite this article Tonetto MR, Pinto SCS, de Nara Souza Rastelli A, Borges AH, Saad JRC, Pedro FLM, de Andrade MF, Bandéca MC. Degree of Conversion of Polymer-matrix Composite assessed by FTIR Analysis. J Contemp Dent Pract 2013;14(1):76-79.

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