Interfacial studies of carbon fibre / polycarbonate composites using dynamic mechanical analysis

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Maria C. Paiva ◽  
João F. Mano
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Dynamic Mechanical Analysis ◽  
Interfacial Shear Strength ◽  
Mechanical Analysis ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Matrix Interaction ◽  
Fragmentation Test ◽  
Fibre Matrix

AbstractUnidirectional composite material samples with ultrahigh modulus carbon fibres, treated and untreated by oxygen plasma, and a polycarbonate matrix were prepared and tested. Dynamic mechanical analysis (DMA) was used to study interfacial fibre/matrix interaction and the fragmentation test method was applied to determine interfacial shear strength. For the composite samples with treated carbon fibres, analyzed by DMA, a consistent shift of the loss modulus peak toward higher temperature was observed. The damping ratio was highly affected by residual stresses along the carbon fibre direction due to the large difference of thermal expansion coefficients of matrix and fibres. Critical fibre length and interfacial shear strength, obtained from the fragmentation test, showed substantial improvement for treated fibres as compared to the untreated ones. Plasma oxidation of the fibre surface improved considerably the fibre-matrix interaction. Care must be taken interpreting the DMA results, due to specific characteristics of the system studied.

scholarly journals A novel approach to functionalise pristine unsized carbon fibre using in situ generated diazonium species to enhance interfacial shear strength

2015 ◽  
Vol 3 (7) ◽  
pp. 3360-3371 ◽  
Author(s):  
L. Servinis ◽  
L. C. Henderson ◽  
L. M. Andrighetto ◽  
M. G. Huson ◽  
T. R. Gengenbach ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Novel Approach ◽  
Fibre Composites

An in situ diazonium grafting methodology was used to decorate the surface of carbon fibres with pendant amines. This methodology was shown to greatly affect IFSS in single fibre composites.

Influence of Unsizing and Carbon Nanotube Grafting of Carbon Fibre on Fibre Matrix Interfacial Shear Strength of Carbon Fibre and Polyamide 6

2019 ◽  
Vol 827 ◽  
pp. 178-183
Author(s):  
Kazuto Tanaka ◽  
Kanako Yamada ◽  
Yoshitake Hinoue ◽  
Tsutao Katayama
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Chemical Vapour ◽  
Polyamide 6 ◽  
Interfacial Shear ◽  
Morphological Observation ◽  
Production Cycle ◽  
Pull Out ◽  
Fibre Matrix

Carbon Fibre Reinforced Thermoplastics (CFRTP) are expected to be applied to the automotive industry instead of CFRP which require curing time, due to the expected short production cycle time of CFRTP, which is using thermoplastic as a matrix. We reported that the grafting of carbon nanotubes (CNTs) on the carbon fibre improves the fibre matrix interfacial shear strength. In our process to graft CNTs on carbon fibre, chemical vapour deposition (CVD) method was used and Ni, which was used as the catalyst, was electrically plated onto carbon fibres. Since commercially available carbon fibre was sized, which may affect the plating behaviour of Ni, the effects of sizing agents on CNT deposition have to be clarified. In this study, Ni for catalytic metal was plated by electrolytic plating using a watt bath on spread PAN-based carbon fibre and unsized carbon fibre, and the influence of the sizing agent to the distribution of Ni was evaluated. The morphological observation of carbon fibre and single fibre pull-out test were conducted to clarify the influence of sizing agent on the CNT deposition and the interfacial shear strength between the CNT grafted carbon fibre and Polyamide 6 (PA6). Uniform distribution of small sized Ni particles can be obtained on unsized carbon fibre and uniform Ni particles results in uniform CNT distribution. The CNT grafted unsized carbon fibre showed higher interfacial shear strength with PA6 than that of sized carbon fibre.

Effects of Temperature on the Fibre Matrix Interfacial Shear Strength of Carbon Nanotube Grafted Carbon Fibre Reinforced Heat Resistant Resin

2019 ◽  
Vol 827 ◽  
pp. 488-492
Author(s):  
Kazuto Tanaka ◽  
Daiki Kugimoto ◽  
Tsutao Katayama
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Pull Out ◽  
Significant Difference ◽  
Effects Of Temperature ◽  
Structural Parts ◽  
Fibre Matrix

Transportation sector is required to reduce CO2 emissions as environmental problems are becoming more serious. Carbon fibre reinforced thermoplastic (CFRTP) are expected to be applied to the structural parts of automobiles and aircrafts because of their superior mechanical properties such as high specific strength, high specific stiffness and high recyclability. One of the problems in using CFRTP for the structural parts is heat resistance, and it is necessary to clarify the mechanical properties under their service environmental temperature. The tensile strength of CFRTP at high temperatures decreases with temperature rise. The fibre matrix interfacial shear strength is reported to be improved by grafting of carbon nanotubes (CNTs) on the surface of carbon fibre. In this study, in order to clarify the effects of temperature on the fibre matrix interfacial shear strength of CNTs grafted carbon fibre reinforced PPS resin, single fibre pull-out test was conducted. While the interfacial shear strength of CNT grafted-CF/PPS is higher than that of As-received-CF/PPS at 25 °C, no significant difference was found in the interfacial shear strength of As-received-CF/PPS and CNT grafted-CF/PPS at 80 °C.

Recycled Carbon Fibres: Contact Angles and Interfacial Bonding with Thermoset Resins

2012 ◽  
Vol 714 ◽  
pp. 255-261 ◽  
Author(s):  
Guo Zhan Jiang ◽  
Stephen J. Pickering
Keyword(s):  
Contact Angle ◽  
Shear Strength ◽  
Carbon Fibre ◽  
Vinyl Ester ◽  
Interfacial Shear Strength ◽  
Contact Angles ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Thermoset Resins ◽  
Bond Method

Recycled T800S carbon fibre from a polymer composite using a pyrolysis process was compared with virgin T800S fibre and the contact angle and interfacial shear strength with epoxy and vinyl ester resins were measured. The contact angles were measured using drop length-height method, and the interfacial shear strengths were measured using micro-bond method. For the same type of resin, the recycled T800S carbon fibre had a greater contact angle and lower interfacial shear strength than those of the virgin fibre.

scholarly journals Investigation on the interfacial properties of CNTs sized carbon fibres in epoxy resin using push-out method via nano-indentation technique

2021 ◽  
Vol 349 ◽  
pp. 01007
Author(s):  
Zhenxue Zhang ◽  
Xiaoying Li ◽  
Hanshan Dong ◽  
Simon Jestin ◽  
Stefania Termine ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Indentation Creep ◽  
Indentation Hardness ◽  
Carbon Fibres ◽  
Complex Formulation ◽  
Reduced Modulus ◽  
Push Out ◽  
Fibre Matrix

In this work, the carbon fibres (CFs) surfaces were modified via sizing and coated with a very thin layer of a complex formulation including carbon nanotubes (CNTs). A push-out method was developed based on nanoindentation to assess the interfacial shear strength of the fibre/matrix. The mechanical properties such as indentation hardness, reduced modulus, indentation displacement and indentation creep of the composite were evaluated by means of the Oliver-Pharr method. The critical load of different composites was measured and the interfacial shear strength (IFSS) was calculated to compare the effect of the CNTs concentration in the sizing solution. Wettability evaluation of the sized fibres was performed prior to nanoindentation to investigate the adhesion of the resin. After push-out testing, characterisation by optical microscopy/SEM was carried out to ratify the results. It was found sizing with a small amount of evenly distributed nano-inclusion on CFs can increase the interfacial shear strength but large amount of sizing could lead to a decrease of the interfacial bonding due to the agglomeration of CNTs on CFs.

The Reliability of Fragmentation Test

2006 ◽  
Vol 312 ◽  
pp. 155-160
Author(s):  
Ying Dai ◽  
Xing Ji ◽  
Lin Ye ◽  
Yiu Wing Mai
Keyword(s):  
Shear Strength ◽  
Failure Modes ◽  
Interfacial Shear Strength ◽  
Stress Singularity ◽  
Singularity Analysis ◽  
Interfacial Shear ◽  
Matrix Cracking ◽  
Fragmentation Test ◽  
Matrix Cracks ◽  
Fiber Breaks

The single fiber fragmentation test has been continuously used to determine the interfacial shear strength. However, the results of the tests were still suspected by some researchers. To evaluate the reliability of the fragmentation test, the stress singularity near the interface end of fragmentation is investigated. According to the local failure modes near the interface end of a fiber fragment, there are three cases of the interface end conditions to be considered for the fragmentation tests: (A) fiber breaks only, without matrix cracking and de-bonding, (B) fiber breaks and matrix cracks, without interface de-bonding, (C) fiber breaks and interface de-bonds, with or without matrix cracking. After the singularity analysis of stress field near the interface end was depicted, it is obvious, that the interfacial shear strength given by the fragmentation test is not proper, because of that a stress singularity exists near the interface end.

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