Muhammad Hasnulhadi Mohammad Jaafar
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Preferred name
Muhammad Hasnulhadi Mohammad Jaafar
Official Name
Muhammad Hasnulhadi, Mohammad Jaafar
Alternative Name
Jaafar, Muhammad Hasnulhadi Mohammad
Hadi, Hasnul
Hasnul, M. J.
Hadi, H.
Hasnulhadi, M.
Jaafar, M. H.
Main Affiliation
Scopus Author ID
55213600000
Researcher ID
CTV-2466-2022

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  • Publication
    Effect of Inclined Angle in Trimming of Ultra-high Strength Steel Sheets Having Inclined and Curved Shapes
    ( 2023-11-01)
    Leong K.Y.
    ;
    Muhammad Hasnulhadi Mohammad Jaafar
    ;
    Nur Liyana Tajul Lile
    ;
    Zailani Zainal Abidin
    ;
    Mohd Zamzuri Mohammad Zain
    ;
    Roshaliza Hamidon
    Trimming the scrap portion of ultra-high strength steel (UHSS) components poses a significant challenge due to the inherent high strength and hardness characteristics of the material. For UHSS components with a higher geometric complexity such consisting of inclined and curved sections, sharp tilt, and small bend radius, the large trimming load results in poor sheared quality and shape defects, which commonly happen in these areas. This research investigated the effects of applying a small inclination angle to the punch in the trimming of the UHSS parts having an inclined and curved shape. The inclined punch was modified to four sets of different degrees of inclination i.e., 1°, 3°, 5°, and 10°. A comparative analysis of the trimming load, trimming energy, sheared edge quality and shape defects was conducted between these modified punches and the normal punch for their effectiveness in the trimming operation. Results showed that the application of inclination angle significantly decreased the trimming load, reduced the trimming energy, and improved the sheared edge surface quality, as well as prevented the shape defects at the inclined and curved zones as compared to the outcomes produced when trimming using the normal punch. The study suggested that the change to the punch geometry is an effective option to improve the performance of the process as well as the quality of the part, particularly in trimming the high-strength components having complex shapes.
  • Publication
    Analysis of multi-thickness plates by successive forging
    (Institution of Engineering and Technology, 2022-01-01)
    Siti Sarah Taib
    ;
    Liyana Tajul
    ;
    Muhammad Hasnulhadi Mohammad Jaafar
    ;
    Mohd Sabri Hussin
    ;
    Hamedon Z.
    The demand of lightweight vehicles is increasing due to environmental issues. To fulfill this demand, tailored blanks are utilized in the production of vehicles. Tailored blanks have been used in car body part such as center pillar and roof rails for the purpose of weight reduction where thickness distribution is being optimized. Tailored blanks are commonly produced by welding and rolling. Tailor-rolled blanks produced by rolling process has continuous thickness transition as compared to tailor-welded blanks and hence stress concentration is reduced. However, the rolling process utilized in the production of tailor-rolled blanks are not commonly available. Hence successive forging process was developed to control the thickness distribution by mean of presses. In this study, successive forging was utilized to control the thickness distribution of a plate by using upper and lower punches. The stroke is constant while the punch was designed to has three different thicknesses to achieve different thickness reduction. The feeding interval was varied for 10 mm and 17 mm. The thickness distribution, material flow and forging load for both feeding interval were analysed and compared with the conventional forging process using finite element analysis.
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