scholarly journals Micromechanical Tests on Natural Fibre Composites with Enzymatically Enhanced Fibre–Matrix Adhesion

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Hanna M. Brodowsky ◽  
Anne Hennig
Keyword(s):  
Shear Strength ◽  
Single Fibre ◽  
Natural Fibre ◽  
Interfacial Shear ◽  
Frictional Stress ◽  
Reinforced Composites ◽  
Fragmentation Test ◽  
Fibre Pullout ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

Abstract Natural fibre–reinforced composites are more sustainable than other composites with respect to the raw materials. Their properties are attractive due to high specific properties, and especially so wherever high damping is valued. As the interphase between fibre and matrix is the region of highest stresses, a strong bond between fibre and matrix is essential for any composites’ properties. The present study compares two methods of determining the interfacial shear stress in natural fibre–reinforced composites: the single fibre fragmentation test and the single fibre pullout test. The studied composites are flax fibre reinforced epoxy. For a variety of fibre–matrix interaction, the fibres are treated with a laccase enzyme and dopamine, which is known to improve the fibre–matrix shear strength. In the observed samples, single fibre fragmentation test data, i.e. of fracture mode and fragment length, scatter when compared to pullout data. In single fibre pullout tests, the local interfacial shear strength showed a 30% increase in the laccase-treated samples, compared to the control samples. The method also permitted an evaluation of the frictional stress occurring after surface failure.

scholarly journals A Method to Measure the Interfacial Shear Stress for Optical Fibres Embedded in Fibre Reinforced Composites

2002 ◽  
Vol 11 (5) ◽  
pp. 096369350201100 ◽  
Author(s):  
J A Etches ◽  
G F Fernando
Keyword(s):  
Interfacial Shear Stress ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Optical Fibres ◽  
Reinforced Composites ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Pull Out ◽  
Unidirectional Glass ◽  
Fibre Reinforced Composites

This paper reports on the development of a prepreg-based fabrication technique to manufacture single fibre pull-out test specimens for conducting interfacial bond strength studies. Optical fibres were embedded in 2 and 16-ply unidirectional glass fibre prepreg and processed in an autoclave using conventional procedures. Fibre pull-out tests were conducted on these specimens and the data obtained are comparable to those reported in the literature.

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 Interfacial Shear Strength of Kenaf Single Fibre Reinforced Polyester Matrix: Observation of Fibre Fracture and Matrix Debonding

2019 ◽  
Vol 7 (4.14) ◽  
pp. 444
Author(s):  
M. N. Zakaria ◽  
A. Crosky ◽  
A. Beehag
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Fibre Bundles ◽  
Fibre Fracture ◽  
Fragmentation Test ◽  
Kenaf Fibre ◽  
Polyester Matrix ◽  
Single Fibres

This paper describes an analysis of the parameters that affect the interfacial properties of kenaf fibre reinforced with polyester matrix. Kenaf fibre bundles were subjected to water treatment through soaking and ultrasonication technique. The specimens of dumbbell shape were fabricated containing kenaf single fibres embedded in polyester matrix. The interfacial shear strength was determined through single fibre fragmentation test. This test was used as a means of investigation, and the observation of fibre fracture and matrix debonding was done using ligt microscope equipped with polarizer light.  

An Energy-Based interpretation of Interfacial Adhesion from Single Fibre Composite Fragmentation Testing

1993 ◽  
Vol 2 (5) ◽  
pp. 096369359300200 ◽  
Author(s):  
H.D. Wagner ◽  
S. Ling
Keyword(s):  
Interfacial Adhesion ◽  
Mechanical Characteristics ◽  
Interfacial Shear Strength ◽  
Fibre Composite ◽  
Stress Transfer ◽  
Single Fibre ◽  
Transfer Length ◽  
Fragmentation Test ◽  
Energy Balance Approach ◽  
Fibre Matrix

An energy balance approach is proposed for the single fibre composite (or fragmentation) test, by which the degree of fibre-matrix bonding is quantified by means of the interfacial energy, rather than the interfacial shear strength, as a function of the fibre geometrical and mechanical characteristics, the stress transfer length, and the debonding length. The validity of the approach is discussed using E-glass fibres embedded in epoxy, both in the dry state and in the presence of hot distilled water.

Fibre-Matrix Interface Development during High Temperature Exposition of Long Fibre Reinforced SiOC Matrix

2013 ◽  
Vol 592-593 ◽  
pp. 401-404
Author(s):  
Zdeněk Chlup ◽  
Martin Černý ◽  
Adam Strachota ◽  
Martina Halasova ◽  
Ivo Dlouhý
Keyword(s):  
High Temperature ◽  
Crack Formation ◽  
Fracture Behaviour ◽  
Point Of View ◽  
Reinforced Composites ◽  
Matrix Interface ◽  
Significant Damage ◽  
The Matrix ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

The fracture behaviour of long fibre reinforced composites is predetermined mainly by properties of fibre-matrix interface. The matrix prepared by pyrolysis of polysiloxane resin possesses ability to resist high temperatures without significant damage under oxidising atmosphere. The application is therefore limited by fibres and possible changes in the fibre matrix interface. The study of development of interface during high temperature exposition is the main aim of this contribution. Application of various techniques as FIB, GIS, TEM, XRD allowed to monitor microstructural changes in the interface of selected places without additional damage caused by preparation. Additionally, it was possible to obtain information about damage, the crack formation, caused by the heat treatment from the fracture mechanics point of view.

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