Ahmad Humaizi Hilmi
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Preferred name
Ahmad Humaizi Hilmi
Official Name
Ahmad Humaizi, Hilmi
Alternative Name
Hilmi, Ahmad Humaizi
Hilmi, A.
Humaizi, Ahmad
Hilmi, A. H
Main Affiliation
Scopus Author ID
57193311438
Researcher ID
W-1988-2019

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  • Publication
    Numerical and Experimental Investigation on Aluminium 6061 Solid Cylindrical Bar Subjected to Close-in Blast Loading
    ( 2024-01-01)
    Mohd Syedi Imran Mohd Dawi
    ;
    Ahmad Humaizi Hilmi
    ;
    Muhamad Saifuldin Abdul Manan
    ;
    Zaidi A.M.A.
    ;
    Mohd Sabri Hussin
    ;
    Chong P.L.
    Compaction force generated by blasting load requires strong material such as steel to act as a plunger to spread the force evenly. The problem with this method is retaining the plunger's original dimension from intolerable deformation. This paper uses ABAQUS software to study the ability to predict the response of solid cylindrical aluminium bars (6061) subjected to different close-in blast loads. The solid cylindrical aluminium bars treated as a plunger were evaluated numerically using a combination of the finite element method (FEM) and smoothed particle hydrodynamic (SPH) methods. The plunger was simulated using the Johnson-Cook (J.C.) model, and Jones-Wilkins-Lee (JWL) equation parameters modelled the explosive. Field tests were conducted by detonating explosives of two different weights, which are 100g and 250g, in the designated blast area. Both data and observation were compared and analysed regarding deformation behaviour in term of dimension difference and fracture. Based on the graph of the deformation dimension versus the plunger length, the deformation trend shows a very close relation between numerical and experimental data with a percentage error of less than 4%. The fracture mode generated using FEM is comparable to the actual specimen. This fracture mode can be described as similar to the behaviour of the specimen obtained using the Taylor impact test. Thus, it can be concluded that the numerical analysis performed for this study is consistent with the actual results.
  • Publication
    Design Optimization of Formula Student Car Steering Knuckle
    ( 2021-01-01)
    Hamid M.F.
    ;
    Mazlan M.
    ;
    Burhanuddin N.
    ;
    Asli U.A.
    ;
    Ahmad Humaizi Hilmi
    ;
    Azhar A.B.M.
    ;
    Kataraki P.S.
    ;
    Mohd Nazri Omar
    The crucial need for capable vehicles to operate at their maximal performance has urged student teams to discover specific portions to alter, especially in ensuring a lightweight condition. For this purpose, designers have considered the redesigning of spot areas such as the knuckle and the certification of new designs with improved capability and reliability. The objective of this project is to replace the existing knuckle system of a formula student car with a new optimized design which demonstrates greater capability in terms of durability, lightweight feature, uniformity of applied force, and stability, particularly in the cornering performance during a race. Therefore, this project ultimately aims to develop a lightweight knuckle for a KKBD formula student car, applicable to withstand various loads from multiple sources. In addition, the study proposed competent material selection and manufacturing procedures for the knuckle component design. Validation of material selection was carried out via HYPER MESH software to discover the design durability by applying various load paths. The simulation results revealed the improvements of the new knuckle design in comparison to the existing design, wherein the load and stress distribution was more ideal. On the other hand, the stress and load distribution of existing design was more focused on the welding area and demonstrates fluctuation with alternating applied loads which may contribute to fracture during a race performance.