Ruslizam Daud
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Ruslizam Daud
Official Name
Ruslizam, Daud
Alternative Name
Daud, Ruslizam
Daud, R.
Main Affiliation
Scopus Author ID
24479667400
Researcher ID
F-5221-2010

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  • Publication
    Energy release rate analysis on the interface cracks of enamel-cement-bracket fracture using virtual crack closure technique
    ( 2017-10-29)
    Syafiq Farhan Samshuri
    ;
    Ruslizam Daud
    ;
    Mohd Afendi Rojan
    ;
    Fauziah Che Mat
    ;
    Khairul Salleh Basaruddin
    ;
    Rozita Hassan
    This paper presents the energy method to evaluate fracture behavior of enamel-cement-bracket system based on cement thickness. Finite element (FE) model of enamel-cement-bracket was constructed by using ANSYS Parametric Design Language (APDL). Three different thickness were used in this study, 0.05, 0.2, and 0.271 mm which assigned as thin, medium and thick for both enamel-cement and cement bracket interface cracks. Virtual crack closure technique (VCCT) was implemented as a simulation method to calculated energy release rate (ERR). Simulation results were obtained for each thickness are discussed by using Griffith's energy balance approach. ERR for thin thickness are found to be the lowest compared to medium and thick. Peak value of ERR also showed a significant different between medium and thick thickness. Therefore, weakest bonding occurred at low cement thickness because less load required to produce enough energy to detach the bracket. For medium and thick thickness, both increased rapidly in energy value at about the mid-point of the enamel-cement interface. This behavior occurred because of the increasing in mechanical and surface energy when the cracks are increasing. However, result for thick thickness are higher at mid-point compared to thin thickness. In conclusion, fracture behavior of enamel cracking process for medium most likely the safest to avoid enamel fracture and withstand bracket debonding.
  • Publication
    Stress analysis of implant-bone fixation at different fracture angle
    ( 2017-10-29)
    Izzawati Basirom
    ;
    Ruslizam Daud
    ;
    Mohd Afendi Rojan
    ;
    Mohd Shukry Abdul Majid
    ;
    Noor Alia Md Zain
    ;
    Mohd Yazid Bajuri
    Internal fixation is a mechanism purposed to maintain and protect the reduction of a fracture. Understanding of the fixation stability is necessary to determine parameters influence the mechanical stability and the risk of implant failure. A static structural analysis on a bone fracture fixation was developed to simulate and analyse the biomechanics of a diaphysis shaft fracture with a compression plate and conventional screws. This study aims to determine a critical area of the implant to be fractured based on different implant material and angle of fracture (i.e. 0°, 30° and 45°). Several factors were shown to influence stability to implant after surgical. The stainless steel, (S. S) and Titanium, (Ti) screws experienced the highest stress at 30° fracture angle. The fracture angle had a most significant effect on the conventional screw as compared to the compression plate. The stress was significantly higher in S.S material as compared to Ti material, with concentrated on the 4th screw for all range of fracture angle. It was also noted that the screws closest to the intense concentration stress areas on the compression plate experienced increasing amounts of stress. The highest was observed at the screw thread-head junction.
  • Publication
    Optimization of Two-Dimensional Finite Element on Primary Bone Type-7 Fracture Model
    ( 2020-09-21)
    Nurul Najwa Mansor
    ;
    Muhammad Ikman Ishak
    ;
    Ruslizam Daud
    Optimization works is an important method for Finite Element (FE) analysis to get better accuracy in simulation study before proceed for further analysis. In this present work, convergence study of local crack tip meshing involving radius of first row element, a/n (DELR) and number of crack tip element (NTHET) is employed on single edge crack in homogenous properties of human cortical bone. Mode I and Mode II Type -7 penetration were determined by using FE analysis and compared with the experimental results. Based on the results, a good agreement is found between numerical and experimental results. The first section in your paper
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