Cylinder test: Development of a new microbond method

Morlin, Bálint; Czigány, Tibor

doi:10.1016/j.polymertesting.2011.10.007

Cited by 18 publications

(21 citation statements)

References 26 publications

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“…The spectra were recorded from 4000 to 500 cm -1 at a resolution of 8 cm -1 , averaged from 128 scans. Characteristic bands of non-cellulosic materials were taken into consideration: 1730 cm -1 ketone/aldehyde C=O stretch for both hemicelluloses and pectins (Xu et al 2013;Espinal-Ruiz et al 2016), 1100 and 1017 cm -1 bands as the strongest peaks of pectic polysaccharides (Kačuráková et al 2000), and 1507 and 1436 cm -1 C=C stretch for the aromatic rings of lignin (Sun et al 2000;Alemdar and Sain 2008) were evaluated. Peak intensities were related to the band at around 2900 cm -1 (C-H stretching) used as internal standard since it practically does not change during various treatments (Łojewska et al 2005).…”

Section: Removal Of Non-cellulosic Materialsmentioning

confidence: 99%

Effect of mild alkali/ultrasound treatment on flax and hemp fibres: the different responses of the two substrates

et al. 2016

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Flax and hemp fibres were treated by various combinations of water/diluted alkaline solution and stirring/ultrasound, respectively. Changes in the microstructure (scanning electron microscopy) and porous structure (low-temperature nitrogen adsorption), removal of non-cellulosic materials (weight loss, FTIR), mean fibre diameter, and adhesion of the polypropylene matrix to the fibres (micro-bond test) were investigated. For both types of fibres, removal of (FTIR) was observed. The fibre diameter of hemp was decreased by several treatments, most of all by stirring in alkali and subsequent sonication in water, while the ultrasound applied in alkali solution did not change the fibre fineness. This can be attributed to the dual effect of ultra-sonication: the swelling effect of alkali combined with ultrasound energy probably served the sticking of inter-fibrillar material rather than their dissolution. Fibre diameter of flax did not change in any circumstances. The porosity of hemp in the mesopore range increased, while that of flax decreased by alkali treatment and subsequent sonication. The reason for this difference might be the dissimilar cell wall structures of the two bast fibres, the high arabinose content of the hemp, and/or the cottonisation of hemp. No treatments altered the fibre-matrix adhesion measured by pulling out the fibre from a micro-droplet of polypropylene.

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Section: Removal Of Non-cellulosic Materialsmentioning

confidence: 99%

Effect of mild alkali/ultrasound treatment on flax and hemp fibres: the different responses of the two substrates

et al. 2016

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“…The essential difference between these two tests lies in their specimen scale and geometry. Some more recent development in micromechanical testing for IFSS focused on altering the sample geometry in MBT to reduce the data scatter [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Development and application of micromechanical techniques for characterising interfacial shear strength in fibre-thermoplastic composites

Yang

Thomason

2012

Polymer Testing

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a b s t r a c tThe development of single fibre pull-out and microbond tests for characterising interfacial strength in thermoplastic composites is reviewed in detail. Manufacture of an experimental jig and sample preparation regimes for both tests are described. The challenges addressed in the sample preparation include the measurement of embedded fibre length for pull-out samples and the low yield rate of axisymmetric resin droplets obtained during sample preparation under nitrogen. The applications of these laboratory developed techniques are demonstrated by characterisation of the interfacial shear strength (IFSS) of glass fibre-polypropylene (GF-PP) and natural fibre-polylactic acid (NF-PLA). The comparison of the IFSS between neat and modified GF-PP showed that both methods were sensitive to the interfacial performance change despite the poor agreement between them for the absolute IFSS values from the same composite. The effect of the material modification was also reflected in load-displacement curves with different behaviour of the frictional motion after complete debonding. When a high level of fibre-matrix adhesion was realised in the composites with weak fibres, the microbond test showed higher feasibility for characterising the IFSS. This was clearly shown in its application to NF-PLA.

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“…In an earlier article [12] we had reported that the interfacial shear strength depends strongly on the test conditions. Therefore the major goal of this paper this was to get a deeper understanding for probable reasons of the strength variations caused by the effects of variations in the cylinder geometry (embedded fiber length (L), and the cylinder diameter (D), see Fig.…”

Section: Introductionmentioning

confidence: 98%

“…The cylinder test, developed by us (see Fig. 1), can be considered as a variant of the microdroplet test [12], that eliminates basic disadvantages of the original method and diminishes some related disturbing effects related to test configuration. Thus, errors due to uncertainties of droplet shape and size, major stress variations arising around the supporting points of the fixing blades and concomitant deformations [13,15,19] could be eliminated with specific cylinder geometry.…”

Section: Introductionmentioning

confidence: 99%

Investigation of fiber/matrix adhesion: test speed and specimen shape effects in the cylinder test

2013

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Abstract:The cylinder test, developed from the microdroplet test, was adapted to assess the interfacial adhesion strength between fiber and matrix. The sensitivity of cylinder test to pullout speed and specimen geometry was measured. It was established that the effect of test speed can be described as a superposition of two opposite, simultaneous effects which have been modeled mathematically by fitting two parameter Weibull curves on the measured datas.Effects of the cylinder size and its geometrical relation on the measured strength values have been analyzed by finite element method. It was concluded that the geometry has a direct influence on the stress formation. Based on the results achieved, recommendations were given on how to perform the novel single fiber cylinder test.

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Cylinder test: Development of a new microbond method

Cited by 18 publications

References 26 publications

Effect of mild alkali/ultrasound treatment on flax and hemp fibres: the different responses of the two substrates

Effect of mild alkali/ultrasound treatment on flax and hemp fibres: the different responses of the two substrates

Development and application of micromechanical techniques for characterising interfacial shear strength in fibre-thermoplastic composites

Investigation of fiber/matrix adhesion: test speed and specimen shape effects in the cylinder test

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