Mohd Fathullah Ghazli@Ghazali
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Preferred name
Mohd Fathullah Ghazli@Ghazali
Official Name
Mohd Fathullah, Ghazli@Ghazali
Alternative Name
Fathullah, Mohd
Ghazli, Mohd
Ghazli, M. F.
Ghazali, Mohd Fathullah
Fathullah, G. M.
Main Affiliation
Scopus Author ID
57428935900
Researcher ID
AAK-5597-2020

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Tool wear and surface evaluation in drilling fly ash geopolymer using HSS, HSS-Co, and HSS-TiN cutting tools

2021 , Mohd Fathullah Ghazli@Ghazali , Mohd. Mustafa Al Bakri Abdullah , Shayfull Zamree Abd. Rahim , Joanna Gondro , Paweł Pietrusiewicz , Sebastian Garus , Tomasz Stachowiak , Andrei Victor Sandu , Muhammad Faheem Mohd. Tahir , Mehmet Erdi Korkmaz , Mohamed Syazwan Osman

This paper reports on the potential use of geopolymer in the drilling process, with respect to tool wear and surface roughness. The objectives of this research are to analyze the tool life of three different economy-grade drill bit uncoated; high-speed steel (HSS), HSS coated with TiN (HSS-TiN), and HSS-cobalt (HSS-Co) in the drilling of geopolymer and to investigate the effect of spindle speed towards the tool life and surface roughness. It was found that, based on the range of parameters set in this experiment, the spindle speed is directly proportional to the tool wear and inversely proportional to surface roughness. It was also observed that HSS-Co produced the lowest value of surface roughness compared to HSS-TiN and uncoated HSS and therefore is the most favorable tool to be used for drilling the material. For HSS, HSS coated with TiN, and HSS-Co, only the drilling with the spindle speed of 100 rpm was able to drill 15 holes without surpassing the maximum tool wear of 0.10 mm. HSS-Co exhibits the greatest tool life by showing the lowest value of flank wear and produce a better surface finish to the sample by a low value of surface roughness value (Ra). This finding explains that geopolymer is possible to be drilled, and therefore, ranges of cutting tools and parameters suggested can be a guideline for researchers and manufacturers to drill geopolymer for further applications

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Warpage optimisation using Recycled Polycar-bonates (PC) on Front Panel Housing

2021 , Nur Aisyah Miza Ahmad Tamizi , Shayfull Zamree Abd. Rahim , Abdellah El-hadj Abdellah , Mohd. Mustafa Al Bakri Abdullah , Marcin Nabiałek , Jerzy J. Wysłocki , Bartłomiej Jeż , Paweł Palutkiewicz , Rozyanty Abdul Rahman , Mohd. Nasir Mat Saad , Mohd Fathullah Ghazli@Ghazali

Many studies have been done using recycled waste materials to minimise environmental problems. It is a great opportunity to explore mechanical recycling and the use of recycled and virgin blend as a material to produce new products with minimum defects. In this study, appropriate processing parameters were considered to mould the front panel housing part using R0% (virgin), R30% (30% virgin: 70% recycled), R40% (40% virgin: 60% recycled) and R50% (50% virgin: 50% recycled) of Polycarbonate (PC). The manufacturing ability and quality during preliminary stage can be predicted through simulation analysis using Autodesk Moldflow Insight 2012 software. The recommended processing parameters and values of warpage in x and y directions can also be obtained using this software. No value of warpage was obtained from simulation studies for x direction on the front panel housing. Therefore, this study only focused on reducing the warpage in the y direction. Response Surface Methodology (RSM) and Genetic Algorithm (GA) optimisation methods were used to find the optimal processing parameters. As the results, the optimal ratio of recycled PC material was found to be R30%, followed by R40% and R50% materials using RSM and GA methods as compared to the average value of warpage on the moulded part using R0%. The most influential processing parameter that contributed to warpage defect was packing pressure for all materials used in this study.

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