Syamir Alihan Showkat Ali
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Syamir Alihan Showkat Ali
Official Name
Syamir Alihan, Showkat Ali
Alternative Name
Alihan Showkat Ali, Syamir
Showkat Ali, Syamir A.
Ali, Syamir Alihan Showkat
Showkat Ali, S.A
Showkat Ali, Syainir Alihan
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Scopus Author ID
57190746528

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  • Publication
    The Effects of Self-Polymerized Polydopamine Coating on Mechanical Properties of Polylactic Acid (PLA)–Kenaf Fiber (KF) in Fused Deposition Modeling (FDM)
    ( 2023-06-01)
    Sanusi Hamat
    ;
    Syamir Alihan Showkat Ali
    ;
    Salit M.S.
    ;
    Yidris N.
    ;
    Showkat Ali S.A.
    ;
    Mohd Sabri Hussin
    ;
    Muhamad Saifuldin Abdul Manan
    ;
    Muhamad Qauyum Zawawi Ahamad Suffin
    ;
    Maliki Ibrahim
    ;
    Ahmad Nabil Mohd Khalil
    This research examines the impact of self-polymerized polydopamine (PDA) coating on the mechanical properties and microstructural behavior of polylactic acid (PLA)/kenaf fiber (KF) composites in fused deposition modeling (FDM). A biodegradable FDM model of natural fiber-reinforced composite (NFRC) filaments, coated with dopamine and reinforced with 5 to 20 wt.% bast kenaf fibers, was developed for 3D printing applications. Tensile, compression, and flexural test specimens were 3D printed, and the influence of kenaf fiber content on their mechanical properties was assessed. A comprehensive characterization of the blended pellets and printed composite materials was performed, encompassing chemical, physical, and microscopic analyses. The results demonstrate that the self-polymerized polydopamine coating acted as a coupling agent, enhancing the interfacial adhesion between kenaf fibers and the PLA matrix and leading to improved mechanical properties. An increase in density and porosity was observed in the FDM specimens of the PLA–PDA–KF composites, proportional to their kenaf fiber content. The enhanced bonding between kenaf fiber particles and the PLA matrix contributed to an increase of up to 13.4% for tensile and 15.3% for flexural in the Young’s modulus of PLA–PDA–KF composites and an increase of up to 30% in compressive stress. The incorporation of polydopamine as a coupling agent in the FDM filament composite led to an improvement in tensile, compressive, and flexural stresses and strain at break, surpassing that of pure PLA, while the reinforcement provided by kenaf fibers was enhanced more by delayed crack growth, resulting in a higher strain at break. The self-polymerized polydopamine coatings exhibit remarkable mechanical properties, suggesting their potential as a sustainable material for diverse applications in FDM.
      2
  • Publication
    Effects on Ply Orientation of Kevlar/Epoxy for Ballistic Impact in Bulletproof Vest Using Non-linear Finite Element Analysis
    ( 2021-01-01)
    Sanusi Hamat
    ;
    Mohd Sabri Hussin
    ;
    Syamir Alihan Showkat Ali
    ;
    Maliki Ibrahim
    The bulletproof vest is vital equipment to stop bullets from penetrating the body. The vest comes with a ballistic panel that can absorb the energy from the ballistic impact. Due to excellent impact resistance and high strength-to-weight ratio, Kevlar fibers composites are widely used for designing a ballistic panel in bulletproof vest body armor to avoid penetration. In this study, the research aims to investigate the ballistic impact behavior on a ballistic panel of Kevlar/Epoxy by using different fibers ply orientation to increase the ballistic impact performance. A finite element analysis using non-linear dynamic simulation was developed in commercial software Abaqus/Explicit to analyze the performance of impact characteristics in penetration depth, damage criteria, and energy-absorbing capacity. The simulation results show that the fibers ply orientation sequence of [0/90/0/90]2sym with 4 mm panel thickness has produced the highest energy absorption of 1523.7 J with least depth penetration of 2.12 mm for the 9 mm bullet traveling at 358 m/s and produce a lowest Hashin’s damage criteria with the value of 0.40. The finding shows that the ply orientation of Kevlar/Epoxy composite ballistic panel has excellent potential in bulletproof body armor application for minimizing the effect of blunt force trauma with less expensive materials usage and light weight ballistic panel.
      1
  • Publication
    Trailing edge bluntness noise reduction using porous treatments
    ( 2020-05-26)
    Syamir Alihan Showkat Ali
    ;
    Azarpeyvand, Mahdi
    ;
    Ilário da Silva, Carlos R.
    This paper provides an experimental investigation of the noise generated from a blunt flat plate and the possibility of the control of noise at source using porous trailing edges. The noise generation characteristics have been examined using a flat plate equipped with surface pressure transducers and far-field microphones and was performed in an anechoic open jet wind tunnel. Two types of porous materials with different porosities and permeability constants were tested. Simultaneous near-field and far-field noise measurements, as well as the boundary layer and wake flow measurements, have been carried out to better understand the effects of the porous treatment to the flow-field and the noise generation mechanism of the plate. Results have shown that the use of porous trailing edges can generally lead to the effective suppression of both the tonal noise, due to the vortex shedding from the blunt trailing edge and also the broadband noise of the plate. The level of the noise reduction was also found to be dependent on the porosity and permeability of the porous materials. The directivity patterns of the radiated noise have shown significant noise reduction at the vortex shedding frequencies. The flow measurement results have shown that the use of porous trailing edges leads to the reduction of flow acceleration over the blunt edges, and subsequently the delay and weakening of the vortex shedding. The results presented in this paper provide an impetus for further experimental and numerical studies on the use of porous treatments for the suppression of aerodynamically generated noise at source.
      2  2
  • Publication
    Control of flows around bluff bodies mediated by porous materials
    ( 2020-06-01)
    Sadeghipour, Sakineh
    ;
    Syamir Alihan Showkat Ali
    ;
    Liu, Xiao
    ;
    Azarpeyvand, Mahdi
    ;
    Thorpe, Graham R.
    There is evidence that the application of porous media to the surfaces of bluff bodies immersed in turbulent fluid flows has a profound effect on the associated aerodynamic phenomena. This idea is explored by performing a series of experiments on cylinders that have circular, square and rectangular cross sections. The flow fields were established around circular cylinders that had been encased in porous media, and which retained the same dimensions of the bare cylinder. The square and rectangular bluff bodies were modified so that their upstream and downstream halves consisted of solid and porous materials respectively. It is found that the porous media applied to the circular cylinder had the most effect on the wake, and the largest effect was observed in the wake generated by the most permeable material. The principal effect of the porous media was to cause the eyes of the recirculation region to be located further downstream. The effect of the permeability is increasingly diminished in the square and rectangular geometries. The presence of the porous media also had a significant effect on the Reynolds stresses. The effect of the porous media applied is to damp the normal stresses further downstream of the bluff bodies.
      2  2
  • Publication
    Design and Mechanical Analysis on a Compact Bicycle Loader for a Small Cubic Centimeter Motorcycle
    ( 2021-01-01)
    Mohd Sabri Hussin
    ;
    Sanusi Hamat
    ;
    Syamir Alihan Showkat Ali
    This paper presents the finite element and fluid-flow analysis on the behavior of a new compact bicycle loader design used for a small cubic centimeter motorcycle. The bicycle loader in the current market comes with various sizes and design which mostly applicable to the large-scale vehicles, namely car and motorcycle with higher cubic centimeter engines. The study aims to design a new compact bicycle loader specifically for small cubic centimeter motorcycles with greater loading capability and security. The finite element analysis was performed using the ABAQUS and ANSYS software to better understand the static and dynamic response of the bicycle loader relating to static and fatigue strengths with specific loads. The fluid-flow to structure analysis has also been carried out using the XFlow Computational Fluid Dynamic software to demonstrate the flow behavior and effect on the bicycle loader with different motorcycle speed. The fatigue analysis was carried out to analyze the structural performance of the bicycle loader. Factors like fatigue life, safety factor, biaxiality indication and fatigue response are plotted for the bicycle loader and the fatigue performance is predicted using the data obtained. The results of the stress distribution show that the maximum von-Mises stress obtained from is about 31.7 MPa, well within the yield strength if the mild steel material. The results show that the highest stress distribution occurs at the mounting part of the bicycle loader, with equivalent stress of 50.29 MPa. The results show that there are no permanent deformations occurred in the bicycle loader during the fatigue test and fulfils the minimum safety requirements needed. The fluid flow analysis show that a strong recirculation region occurs at the front of the motorcycle, bicycle headset and suspension fork and downstream of the bicycle tires, however, no obvious flow disturbance is observed in the vicinity of the bicycle loader.
      1
  • Publication
    Tensile Properties of 3D Printed Recycled PLA Filament: A Detailed Study on Filament Fabrication Parameters
    ( 2023-10-01)
    Sanusi Hamat
    ;
    Ishak M.R.
    ;
    Salit M.S.
    ;
    Yidris N.
    ;
    Syamir Alihan Showkat Ali
    ;
    Mohd Sabri Hussin
    ;
    Maliki Ibrahim
    ;
    Asmawi Sanuddin
    Polylactic acid (PLA), a biodegradable and biocompatible thermoplastic commonly utilized in 3D Printing filaments, undergoes changes in properties upon recycling. The objective was to elucidate the role of extrusion temperature and screw speed in modulating the quality of recycled PLA filament, as well as in controlling its dimensional attributes. Recycled PLA pellets (3D850D) were extruded using a single filament extruder machine within an extrusion temperature range of 145°C to 165°C and a screw speed varying from 2 rpm to 6 rpm. The extruded filaments were subsequently 3D printed into specimens adopting a 0° raster angle, line infill pattern, and a 100 percent infill density, then tested as per ASTM D638 mechanical standards. The study revealed a profound influence of extrusion parameters on the filament's ultimate tensile strength, yield strength, and diameter. Optimal extrusion conditions-155°C and 5 rpm-resulted in maximum mechanical strengths, while the parameters yielding filament diameters closest to commercial standards were identified as 5 rpm and 155°C. These results under-score the possibility of optimizing the recycled PLA filament's properties through adept control of extrusion parameters. Consequently, this investigation supports the potential use of recycled PLA filament in the 3D printing industry as a sustainable and performance-efficient material, offering a tangible step towards environmentally friendly additive manufacturing practices.
      1