Mohd Fathullah Ghazli@Ghazali
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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.
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Scopus Author ID
57428935900
Researcher ID
AAK-5597-2020

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  • Publication
    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.
  • Publication
    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.
  • Publication
    Optimisation of shrinkage and strength on thick plate part using recycled LDPE materials
    ( 2021)
    Norshahira Roslan
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Abdellah El-hadj Abdellah
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Katarzyna Błoch
    ;
    Paweł Pietrusiewicz
    ;
    Marcin Nabiałek
    ;
    Janusz Szmidla
    ;
    Dariusz Kwiatkowski
    ;
    Joel Oliveira Correia Vasco
    ;
    Mohd. Nasir Mat Saad
    ;
    Mohd Fathullah Ghazli@Ghazali
    Achieving good quality of products from plastic injection moulding processes is very challenging, since the process comprises many affecting parameters. Common defects such as warpage are hard to avoid, and the defective parts will eventually go to waste, leading to unnecessary costs to the manufacturer. The use of recycled material from postindustrial waste has been studied by a few researchers. However, the application of an optimisation method by which to optimise processing parameters to mould parts using recycled materials remains lacking. In this study, Response Surface Methodology (RSM) and Particle Swarm Optimisation (PSO) methods were conducted on thick plate parts moulded using virgin and recycled low-density polyethylene (LDPE) materials (100:0, 70:30, 60:40 and 50:50; virgin to recycle material ratios) to find the optimal input parameters for each of the material ratios. Shrinkage in the x and y directions increased in correlation with the recycled ratio, compared to virgin material. Meanwhile, the tensile strength of the thick plate part continued to decrease when the recycled ratio increased. R30 (70:30) had the optimum shrinkage in the x direction with respect to R0 (100:0) material where the shrinkage increased by 24.49% (RSM) and 33.20% (PSO). On the other hand, the shrinkage in the y direction for R30 material increased by 4.48% (RSM) and decreased by 2.67% (PSO), while the tensile strength of R30 (70:30) material decreased by 0.51% (RSM) and 2.68% (PSO) as compared to R0 (100:0) material. Validation tests indicated that the optimal setting of processing parameter suggested by PSO and RSM for R0 (100:0), R30 (70:30), R40 (60:40) and R50 (50:50) was less than 10%.
  • Publication
    Comparison of hook and straight steel fibers addition on malaysian fly ash-based geopolymer concrete on the slump, density, water absorption and mechanical properties
    ( 2021)
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Ratnasamy Muniandy
    ;
    Mohammad Firdaus Abu Hashim
    ;
    Katarzyna Błoch
    ;
    Bartłomiej Jeż
    ;
    Sebastian Garus
    ;
    Paweł Palutkiewicz
    ;
    Nurul Aida Mohd Mortar
    ;
    Mohd Fathullah Ghazli@Ghazali
    Geopolymer concrete has the potential to replace ordinary Portland cement which can reduce carbon dioxide emission to the environment. The addition of different amounts of steel fibers, as well as different types of end-shape fibers, could alter the performance of geopolymer concrete. The source of aluminosilicate (fly ash) used in the production of geopolymer concrete may lead to a different result. This study focuses on the comparison between Malaysian fly ash geopolymer concrete with the addition of hooked steel fibers and geopolymer concrete with the addition of straight-end steel fibers to the physical and mechanical properties. Malaysian fly ash was first characterized by X-ray fluorescence (XRF) to identify the chemical composition. The sample of steel fiber reinforced geopolymer concrete was produced by mixing fly ash, alkali activators, aggregates, and specific amounts of hook or straight steel fibers. The steel fibers addition for both types of fibers are 0%, 0.5%, 1.0%, 1.5%, and 2.0% by volume percentage. The samples were cured at room temperature. The physical properties (slump, density, and water absorption) of reinforced geopolymer concrete were studied. Meanwhile, a mechanical performance which is compressive, as well as the flexural strength was studied. The results show that the pattern in physical properties of geopolymer concrete for both types of fibers addition is almost similar where the slump is decreased with density and water absorption is increased with the increasing amount of fibers addition. However, the addition of hook steel fiber to the geopolymer concrete produced a lower slump than the addition of straight steel fibers. Meanwhile, the addition of hook steel fiber to the geopolymer concrete shows a higher density and water absorption compared to the sample with the addition of straight steel fibers. However, the difference is not significant. Besides, samples with the addition of hook steel fibers give better performance for compressive and flexural strength compared to the samples with the addition of straight steel fibers where the highest is at 1.0% of fibers addition.
  • Publication
    Printing Parameter Optimization of Biodegradable PLA Stent Strut Thickness by using Response Surface Methodology (RSM)
    ( 2020-07-09)
    Asyraf Azli A.
    ;
    Muhammad N.
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Mohd Fathullah Ghazli@Ghazali
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Andrei Victor S.
    This work presents printing parameter optimization of 3D printed biodegradable PLA stent. This study is motivated by a gap in current knowledge in 3D printing of stents identified in an extensive literature review. With the demand of coronary artery stents rising every year, the stent production demands a higher quality, lower cost, faster and economical process. Due to its availability relatively low-cost price and adaptability, PLA has been identified for an ideal material for biodegradable stents. Previously, laser micromachining was widely used for processing coronary stent. The emerging of 3D printing process has gained attention for its low cost, high reliability, simple operation and flexibility has shown potential as promising solutions in stents fabrication. The use of 3D printing for stent manufacturing purpose is newly emerge and not widely reported. Up to now, less research has been conducted on 3D printed PLA coronary artery stents. This work therefore, aims to study the relationship of the 3D printing processing parameter towards stents quality. Strut thickness become the key aspects in stents manufacturing. Processing parameter optimization was performed by using Response Surface Methodology (RSM). Nozzle temperature and printing speed were both effecting the strut thickness formations regardless of printing orientations.
  • Publication
    Thermal insulation and mechanical properties in the presence of glass bubble in fly ash geopolymer paste
    ( 2022-01-01)
    Noor Fifinatasha Shahedan
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Norsuria Mahmed
    ;
    Liew Yun Ming
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Ikmal Hakem Abdul Aziz
    ;
    Kadir A.A.
    ;
    Sandu A.V.
    ;
    Mohd Fathullah Ghazli@Ghazali
    The density, compressive strength, and thermal insulation properties of fly ash geopolymer paste are reported. Novel insulation material of glass bubble was used as a replacement of fly ash binder to significantly enhance the mechanical and thermal properties compared to the geopolymer paste. The results showed that the density and compressive strength of 50% glass bubble was 1.45 g/ cm3 and 42.5 MPa, respectively, meeting the standard requirement for structural concrete. Meanwhile, the compatibility of 50% glass bubbles tested showed that the thermal conductivity (0.898 W/mK), specific heat (2.141 MJ/m3K), and thermal diffusivity (0.572 mm2/s) in meeting the same requirement. The improvement of thermal insulation properties revealed the potential use of glass bubbles as an insulation material in construction material.
      1
  • Publication
    DFMA method: Analysis on a mechanical sharpener
    ( 2021-07-21)
    Muhamad Farizuan Rosli
    ;
    Noorhafiza Muhammad
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd. Nasir Mat Saad
    ;
    Mohd Fathullah Ghazli@Ghazali
    ;
    Shafeeq Ahmad Shamim Ahmad
    Creativity and innovation in any organization are vital to its successful performance. Innovate a product have to consists of many different process of design. The flow of design such as identifying the problem of the product, determining the objective of the research, identifying the customer needs, undergoing survey and analysis data to get the list of metrics. Besides that, house of quality and concept generation will help the research to get know whether the design is full fill the customer needs or not. Concept testing will help to identify the final concept selection. Modelling of the final concept can help to show the target marketing to give their own response on this research. Customer needs can help to make the product undergo further improvement.
      1
  • Publication
    Printing parameter optimization of stent length accuracy by using Response Surface Methodology (RSM)
    ( 2021-05-03)
    Amirul Asyraf Azli
    ;
    Noorhafiza Muhammad
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Mohd Fathullah Ghazli@Ghazali
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd Shuhidan Saleh
    ;
    Victor S.A.
    The demand for coronary artery stents keeps rising every year with a higher quality, lower cost, faster and economical process. Due to its availability relatively low-cost price and adaptability, Polylactic-acid (PLA) has been identified as an ideal material for biodegradable stents. Previously, laser micromachining was widely used for processing coronary stent but this manufacturing process required high investment. Apart from that, this process was unpractical and unfeasible to be machined with certain material and complex design. Alternatively, FDM 3D printing emerges as a system for producing stent and gained attention for its low cost, high reliability, simple operation, flexibility and has shown potential as promising solutions in stents fabrication. Stent length is one of the key aspects in stents manufacturing. In this work, optical microscope is used to measure the stent characterizations while processing parameter optimization was performed by using Response Surface Methodology (RSM). Printing orientation affects the stent length dimensional accuracy. Both XY and ZX are capable to develop PLA stents but XY-orientation is the ideal printing orientation as it provides good dimensional precision for stent characterizations and a lower risk for the structure and geometry to be sagging.
      4
  • Publication
    Analysis on addition of novel Sm3+ in replacing Eu3+ in lieu(0.45-x)Gd0.55(MoO4)2 phosphor
    ( 2020-08-01)
    Mohd Fathullah Ghazli@Ghazali
    ;
    Hussin R.
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Zailani N.S.
    Europium is amongst the most critical and expensive rare earths due to its luminescence properties for red element in displays and lighting technology. As the market demand of Europium is now at scarce, this paper tried minimize the use of Europium. In the mean time, Samarium (Sm3+) has been of interests as it can contribute in the red/orange emitting activator but researches of Sm3+ potentials in replacing Eu3+ was hardly found. In this article, a series of red phosphors LiEu(0.55-x)Gd0.45(MoO4)2Smx were synthesised using solid-state reaction and an XRD analysis conducted confirmed that the structure of the compounds to remain as tetragonal scheelite structure. Results showed that 0.10 mol of Sm3+ can increase the luminescence intensity and the overlaid patterns show that there are no additional peaks occurred in the increasing of Sm3+ to the compound which confirm that the structure remained tetragonal scheelite structure with space group I41/a. This finding has opened an opportunity for industries and researchers to use Sm3+ in reducing the cost of consuming Eu3+ in lighting technologies.
      2
  • Publication
    Elektronik asas : untuk pelajar mekanikal
    ( 2015)
    Amarul Talip
    ;
    Mohd Sazli Saad
    ;
    Mohd Fathullah Ghazli@Ghazali
    ;
    Nur Ismalina Haris
    Buku ini mengandungi lapan (8) bab kesemuanya di mana ia telah disusun dan mencakupi bab-bab asas yang penting untuk membentuk satu ilmu asas Teknologi Elektrik yang lengkap untuk para pelajar Kejuruteraan Mekanikal. Antara bab-bab tersebut ialah, Asas Kejuruteraan Elektrik, Litar Arus Terus, Litar Arus Ulang-alik, Sistem Tiga Fasa, Elektromagnetik, Pengubah, Mesin Arus Terus dan Mesin Pearuh Tiga Fasa. Di samping itu, buku ini juga diharapkan dapat menjadi rujukan para pelajar dari politeknik khasnya dan institusi pengajian tinggi amnya kerana bilangan buku-buku rujukan yang terdapat dalam Bahasa Melayu adalah terhad. Dalam usaha untuk menambah bilangan buku-buku rujukan yang ditulis dalam Bahasa Melayu, penghasilan buku ini diharapkan dapat membantu pelajar Kejuruteraan khususnya Kejuruteraan Mekanikal untuk lebih memahami dan menguasai Asas Teknologi Elektrik.
      192  28