On the single fibre pullout and pushout problem: Effect of fibre anisotropy

1993 ◽  
Vol 44 (4) ◽  
pp. 769-775 ◽  
Author(s):  
Li-Min Zhou ◽  
Yiu-Wing Mai
Keyword(s):  
Single Fibre ◽  
Fibre Pullout

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.

Single fibre pullout tests on auxetic polymeric fibres

2005 ◽  
Vol 40 (16) ◽  
pp. 4355-4364 ◽  
Author(s):  
V. R. Simkins ◽  
A. Alderson ◽  
P. J. Davies ◽  
K. L. Alderson
Keyword(s):  
Single Fibre ◽  
Pullout Tests ◽  
Fibre Pullout

scholarly journals Evaluation of locally available synthetic macro fibres in a single-fibre pullout test in concrete

2018 ◽  
Vol 60 (1) ◽  
pp. 21-30
Author(s):  
C. M. Odendaal ◽  
A. J. Babafemi ◽  
R. Combrinck ◽  
W. I. de Villiers
Keyword(s):  
Pullout Test ◽  
Single Fibre ◽  
Fibre Pullout

scholarly journals Interfacial Adhesion Characteristics of Kenaf Fibres Subjected to Different Polymer Matrices and Fibre Treatments

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Umar Nirmal ◽  
Saijod T. W. Lau ◽  
Jamil Hashim
Keyword(s):  
Interfacial Adhesion ◽  
Single Fibre ◽  
Polymer Matrices ◽  
Alkaline Solutions ◽  
Fibre Breakage ◽  
Chemical Treatments ◽  
Fibre Pullout ◽  
Failure Morphology ◽  
Interfacial Adhesion Strength ◽  
Kenaf Fibres

This study is aimed at determining the interfacial adhesion strength (IAS) of kenaf fibres using different chemical treatments in hydrochloric (HCl) and sodium hydroxide (NaOH) with different concentrations. Single fibre pullout tests (SFPT) were carried out for both untreated and treated fibres partially embedded into three different polymer matrices; polyester, epoxy, and polyurethane (PU) as reinforcement blocks and tested under dry loading conditions. The study revealed that kenaf fibres treated with 6% NaOH subjected to polyester, epoxy, and PU matrices exhibits excellent IAS while poor in acidic treatment. The effect of SFPT results was mainly attributed to chemical composition of the fibres, types of fibre treatments, and variation in resin viscosities. By scanning electron microscopy examination of the material failure morphology, the fibres experienced brittle and ductile fibre breakage mechanisms after treatment with acidic and alkaline solutions.

scholarly journals Microbond fibre bundle pullout technique to evaluate the interfacial adhesion of polyethylene and polypropylene self reinforced composites

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
M. Sharan Chandran ◽  
K. Padmanabhan
Keyword(s):  
Composite Materials ◽  
Interfacial Adhesion ◽  
Interfacial Properties ◽  
Pullout Test ◽  
Single Fibre ◽  
Interface Properties ◽  
Reinforced Composites ◽  
Adhesion Properties ◽  
Fibre Pullout ◽  
The Matrix

Abstract Self reinforced polymer composites possess a comparable shear and tensile strength unlike the glass or carbon fibre reinforced composites. Important deciding factors of overall efficiency of composite materials are the interfacial adhesion properties between the fibre and the matrix. Structural properties and processability of composite materials are also dependent on adhesion between the fibre and the matrix. Polypropylene and polyethylene self-reinforced composites are the systems investigated here for the purpose of analyzing the interfacial properties of these systems. Multiple fibre pullout test is an alternate method for single fibre pullout test with added advantages of more reliable statistically averaged data with less standard deviation and minimized chances for fibre breakage during testing. This test can also be verified for various volume fractions unlike single fibre pullout test. Micro bonds of matrix materials are cured on a bundle of fibres and by using a micro vise as an additional fixture, the interfacial strength and other interfacial properties are evaluated through fibre pullout. Surface tension between the fibre and the matrix plays an important role in this test. Thus from the contact angle and the frictional properties of the interface, the interface properties are evaluated. Interface properties obtained from this meso-mechanical semi empirical method are also compared with the properties evaluated from micromechanical formulations. Spectroscopic studies revealed the bonding characteristics during the interface formation and after failure. Fractography reveals the cause and nature of failure and substantiate the analysis.

On the effect of different polymer matrix and fibre treatment on single fibre pullout test using betelnut fibres

2011 ◽  
Vol 32 (5) ◽  
pp. 2717-2726 ◽  
Author(s):  
Umar Nirmal ◽  
Narish Singh ◽  
Jamil Hashim ◽  
Saijod T.W. Lau ◽  
Nadia Jamil
Keyword(s):  
Polymer Matrix ◽  
Pullout Test ◽  
Single Fibre ◽  
Fibre Pullout ◽  
Fibre Treatment

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.

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