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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mcilhagger, Alistair
University of Ulster
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2024Lap Shear Strength and Fatigue Analysis of Continuous Carbon-Fibre-Reinforced 3D-Printed Thermoplastic Composites by Varying the Load and Fibre Contentcitations
- 2022Influence of extrusion parameters on filled polyphenylsulfone tufting yarns on open-hole tensile strengthcitations
- 2022On the application of Vickers micro hardness testing to isotactic polypropylenecitations
- 2022Characterization of continuous carbon fibre reinforced 3D printed polymer composites with varying fibre volume fractionscitations
- 2022Effect of laser processing parameters and carbon black on morphological and mechanical properties of welded polypropylenecitations
- 20223D Printed Strontium and Zinc Doped Hydroxyapatite Loaded PEEK for Craniomaxillofacial Implantscitations
- 2021Experimental Investigations of 3D Woven Layer to-Layer Carbon/Epoxy Composites at Different Strain Ratescitations
- 2021Influence of Binder Float Length on the Out-of-Plane and Axial Impact Performance of 3D Woven Compositescitations
- 2020Improved crush energy absorption in 3D woven composites by pick density modificationcitations
- 2019Influence of Textile Architecture on the Mechanical Properties of 3D Woven Carbon Composites
- 2019Comparative studies of structure property relationship between glass/epoxy and carbon/epoxy 3D woven composites
- 2019Energy Absorption Mechanisms in Layer-to-Layer 3D Woven Composites
- 2019Improved Energy Absorption in 3D Woven Composites by Weave Parameter Manipulationcitations
- 2019A unified framework for the multi-scale computational homogenisation of 3D-textile compositescitations
- 2018Multiscale Computational Homogenisation of 3D Textile-based Fiber Reinforced Polymer Composites
- 2017Development of an embedded thin-film strain-gauge-based SHM network into 3D-woven composite structure for wind turbine bladescitations
- 2017Development of an Embedded Thin-film Strain-sensor-based SHM for Composite Tidal Turbine Blades
- 2010Analytical Elastic Stiffness Model for 3D Woven Orthogonal Interlock Compositescitations
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article
On the application of Vickers micro hardness testing to isotactic polypropylene
Abstract
Hardness is a useful measure of a material’s resistance to permanent indentation; but for viscoelastic polymers, hardness data are highly dependent on the test type and the parameter set chosen. Vickers microhardness testing is used to leave small indents (<150 µm) and is shown to be applicable to polymers. A detailed investigation of the required steps for microhardness testing in isotactic polypropylene (iPP) is provided. Samples should be mounted in epoxy resin in order to maintain curing temperatures at room temperature. Mounted samples can be ground and polished in a semi-automatic polisher using graduated SiC paper (wet grinding) but progressing onto alumina suspension for polishing. Final polishing should be performed with 0.05-µm alumina suspension. The hardness measured was shown to be dependent on load and dwell time with a much greater dependency on dwell time. Strain recovery was shown to be completed after a time period equal to the dwell time. This study shows that indents can be measured thereafter, and it is recommended that they be measured within a 24 h period after the indent was created. After data fitting, the equation for hardness was shown to follow a power law with load and dwell time as the main variables. Fitting parameters were compared to those found in the literature, and it was found that parameters were significantly different to those reported elsewhere. Therefore, this study highlights the importance of calibrating on a case-by-case basis. Finally, to show the usefulness of the Vickers micro-hardness testing method, the calibrated test method was applied on iPP with additions of carbon black up to 3 wt.%. Comparisons were made with data from the literature, but the hardness data generated in our work were found to be at least twice that reported in the literature. The testing parameters were not cited in the literature: specifically, the dwell time was not provided, and this generated doubt on the usefulness of the cited data. Hence, this work is intended to serve as an ...