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Article
Publication date: 8 February 2021

Muneer Umar, Michael Ikpi Ofem, Auwal Sani Anwar and Abubakar Garba Salisu

This study aims to fabricate and study the effect of five cumulative graphite (G) and graphite nanoplatelets (GNP) filler loading composites by polymerising PA6 precursor;…

Abstract

Purpose

This study aims to fabricate and study the effect of five cumulative graphite (G) and graphite nanoplatelets (GNP) filler loading composites by polymerising PA6 precursor; monomer epsilon caprolactam with the two carbons in situ while taking cognisance of the mixing effects (simultaneous stirring and sonication at varying amplitudes and duration). Different aspect ratios will be used to model the two streams of polymerisations.

Design/methodology/approach

High viscosity extrusion grade PA6 and synthetic G of less than 2 µm particle size were used as fillers. GNP and G are dried for 6 h in vacuum oven at 90°C. Prior to in situ polymerisation, probe sonication was applied to disperse fillers in molten ɛ-caprolactam, the PA6 monomer. Five carbon loadings were made, that is 5–25 Wt.% for G and 0.5–2.5 Wt.% for GNP composites. Two different sonification regimes were applied 20% sonication amplitude for 20 min (20/20) and 40% sonication amplitude for 10 min (40/10).

Findings

Better tensile properties were achieved using the 20/20 processing streams for both G and GNP. The G- and the GNP-based composites systems of the 20/20 processing stream had tensile modulus and yield strength retained or improved above the unfilled PA6 value. The highest modulus obtained in the 20/20 streams are 1,878 and 1,201 MPa, respectively, for GNP and G at the highest loading levels, while the 40/10 processing streams had 963 and 1,247 MPa, respectively, for the GNP and G.

Originality/value

To the best of the authors’ knowledge, nobody has ever used sonification amplitude to compare mechanical properties.

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Expert briefing
Publication date: 20 October 2017

ZANU-PF infighting.

Details

DOI: 10.1108/OXAN-DB225246

ISSN: 2633-304X

Keywords

Geographic
Topical
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Expert briefing
Publication date: 9 March 2017

The succession struggle within ZANU-PF to replace Mugabe -- widely believed to be physically incapable of serving more than one additional term in office -- has led to…

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DOI: 10.1108/OXAN-DB218498

ISSN: 2633-304X

Keywords

Geographic
Topical
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Expert briefing
Publication date: 23 February 2016

Political outlook in Zimbabwe.

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DOI: 10.1108/OXAN-DB209581

ISSN: 2633-304X

Keywords

Geographic
Topical

Abstract

Details

Quantitative and Empirical Analysis of Nonlinear Dynamic Macromodels
Type: Book
ISBN: 978-0-44452-122-4

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Article
Publication date: 16 November 2012

N. Masmoudi and M. Khlif

The purpose of this present work is to investigate how different parameters of the blast cleaning process affect properties and quality of brass parts surface. It aims to…

Abstract

Purpose

The purpose of this present work is to investigate how different parameters of the blast cleaning process affect properties and quality of brass parts surface. It aims to study the following process variables: particle abrasive shape: (spherical (S) and angular (G) shot), particle abrasive size (S170, G40 and G50) and the impact velocity (40 m/s, 60 m/s and 80 m/s).

Design/methodology/approach

An experimental approach based on three testing methods is used to quantify the analysis of particulate contaminants on substrates surfaces. These methods are: SEM, BSEM and EDXA plots from SEM imaging.

Findings

The results obtained clearly show that the particle embedment decreases with decreasing of the size of angular abrasive. An increase in the embedment could be noted as impact velocity increased. It was also found that the angular abrasives have delivered a contamination level higher than that delivered by spherical abrasives. Furthermore, it was demonstrated that the abrasive debris nature embedded in the treated surfaces is the iron. The coupling of this debris with the base metal (copper) in the presence of wetland causes an electrochemical corrosion. Then, if the contamination level decreases, the corrosion rate in treated brass parts by steel shots decreases also.

Originality/value

Search in the case of blast cleaning for the brass parts by steel shots has not been done previously. Using the spherical shape of the abrasive projected with a moderate impact velocity will be a solution in this case.

Details

Multidiscipline Modeling in Materials and Structures, vol. 8 no. 4
Type: Research Article
ISSN: 1573-6105

Keywords

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Article
Publication date: 1 January 1973

Hoechst Cassella Dyestuffs Ltd

The method described is adopted in Farbwerke Hoechst AG for testing the colouring properties of organic pigments. The method closely follows the instructions for…

Abstract

The method described is adopted in Farbwerke Hoechst AG for testing the colouring properties of organic pigments. The method closely follows the instructions for determining the relative tinctorial strength of coloured pigments according to DIN 53 204. It has been found to be necessary to make minor modifications in testing organic pigments. A pigment grinder of a specific type is used for the dispersion process. Depending on the dispersibility of the pigment, a known, readily reproducible degree of pigment dispersion is attained, which is comparable to that of a production batch after one to two passages on a triple‐roll mill. Somewhat different results may be obtained if different dispersing equipment is used.

Details

Pigment & Resin Technology, vol. 2 no. 1
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 29 March 2018

Osama (Sam) Salem

In fire condition, the limiting temperature of a restrained steel beam depends on a few parameters, e.g. temperature distributions along and across the beam, beam’s load…

Abstract

Purpose

In fire condition, the limiting temperature of a restrained steel beam depends on a few parameters, e.g. temperature distributions along and across the beam, beam’s load ratio and span length. The purpose of this study is to investigate the structural fire behaviour of axially restrained steel beams under different beam’s load ratios, taking into consideration the effect of the beam’s end connections configuration.

Design/methodology/approach

A three-dimensional finite element (FE) computer model has been developed to simulate the structural fire behaviour of axially restrained steel beams and their end connections. After successfully validating the developed model against the outcomes of the available large-size fire resistance experiments, the FE model has been used in a parametric study to investigate the beam’s load ratio effect on the behaviour of the axially restrained steel beams and their end connections.

Findings

The parametric study showed that increasing the beam loading level significantly increased the beam deflections at elevated temperatures; where, increasing the beam’s load ratio from 0.5 to 0.9 reduced the beam fire resistance by about 100 s. In contrast, decreasing the beam’s load ratio from 0.5 to 0.3 allowed the beam to easily achieve a 30-min fire resistance rating with no fire protection applied.

Originality/value

Experimental parametric studies are difficult to control in a laboratory setting and are also expensive and time consuming. Therefore, the reasonable accuracy of the validated FE model in reproducing the experimental fire behaviour of steel beams and their end connections makes it a very useful tool for both numerical and analytical studies.

Details

Journal of Structural Fire Engineering, vol. 9 no. 4
Type: Research Article
ISSN: 2040-2317

Keywords

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Executive summary
Publication date: 25 June 2018

ZIMBABWE: Mnangagwa will try ease instability fears

Details

DOI: 10.1108/OXAN-ES235660

ISSN: 2633-304X

Keywords

Geographic
Topical
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Executive summary
Publication date: 25 November 2015

ZIMBABWE/CHINA: Talks to focus on development loans

Details

DOI: 10.1108/OXAN-ES206913

ISSN: 2633-304X

Keywords

Geographic
Topical
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