Mohd Al-Hafiz Mohd Nawi
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Preferred name
Mohd Al-Hafiz Mohd Nawi
Official Name
Mohd Al-Hafiz , Mohd Nawi
Alternative Name
Hafiz, M. A.
Nawi, M. A.H.M.
Nawi, M. A.M.
Nawi, Mohd Al Hafiz Mohd
Nawi, M. H.
Main Affiliation
Scopus Author ID
57195980205
Researcher ID
IOU-7551-2023

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  • Publication
    The effect of a n overweight backpack towards comfortability and L5s1 among primary school student
    ( 2021)
    M.S. Kasim
    ;
    N.A. Syaherah
    ;
    R. Izamshah
    ;
    W.N.F. Mohamad
    ;
    M.S.A. Hafiz
    ;
    Mohd Al-Hafiz Mohd Nawi
    The issue of overweight pupils’ school bag has been a subject of vast of discussion by the parents which may associate to back pain. This paper presents the effect of the weight of the backpack towards the lumbosacral joint (L5/S1) and conformability among primary student. A total of 10 respondents from the primary school students were involved in this study. Questionnaires of psychophysical experience with eight areas of body surveys were distributed as to obtain the comfortable feedback. The participants were required to perform three activities; standing without load; standing and climbing with load. The pupils are required to carry a backpack in symmetrical manner. These three activities will be recorded by using a digital camera. Due to safety measure during COVID-19 pandemic, the ImageJ Software was used to measure the joint angles and gait parameters. Based on the data measured by the software, a static and dynamic analysis were applied to calculate the torque and force for the trunk muscle, compressive and a shear force acting on the lumbosacral joint. Based on the result, It was found the student to carry 17% of their body weight, which is beyond of the 10-15% recommendation threshold. The survey shows, 40% of the students feel very uncomfortable especially at their low back, shoulder, head, and neck area due to heavy backpack. It shows the compression force on L4L5 during climbing slightly exceed the recommendation limit by NIOSH, while the others within the acceptable level. The related stakeholder should provide solutions, which conducive in order to prevent and control the occurrence of low back pain among primary student.
  • Publication
    Simulation study on structure bumper beam using finite element analysis
    (Universiti Malaysia Perlis (UniMAP), 2022-03)
    A. Hambali
    ;
    M. S Kasim
    ;
    N. H. N. Husshini
    ;
    S. Muhammad Nasiruddin
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    J. Rosidah
    ;
    S. B Mohamed
    ;
    Teruaki Ito
    One of the main parts of the automotive bumper system is the bumper beam. A bumper beam is a safety feature of a car where it functions to absorb impact energy during a collision. It is important to improve the bumper beam design to improve vehicle safety. The objective of the paper is to investigate the most suitable bumper beam cross-section at the conceptual design stage using finite element analysis (FEA). There are five (5) conceptual designs with different types of cross-sections that have been proposed to evaluate its energy absorption analysis through ANSYS LS DYNA software. The indicators considered in evaluating and determining the best design are energy absorption, specific energy absorption (SEA) and deformation of the bumper beam after crashed. For the selection process, six bumper beam structures have been considered. Analytical hierarchy process and Technique for Order of Preference by Similarity to Ideal Solution (AHP-TOPSIS) method was employed to determine the best design through identified product design specification (PDS) of frontal low-speed impact low carbon steel bumper beam. Through the seven elements identified in product design specification (PDS) using the AHP-TOPSIS method, conceptual design 4 (CD-4) bumper beam was the best bumper beam design with a Relative closeness coefficient (Ci) value of 0.564.