Mohd Syedi Imran Mohd Dawi
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Preferred name
Mohd Syedi Imran Mohd Dawi
Official Name
Mohd Syedi Imran , Mohd Dawi
Alternative Name
Dawi, Mohd Syedi Imran Mohd
Dawi, M. S. I. M.
Dawi, Mohammad
Main Affiliation
Scopus Author ID
56735650300
56267546700
Researcher ID
EVR-2750-2022

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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.

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Experimental and finite element modeling of partial infill patterns for thermoplastic polymer extrusion 3D printed material using elasto-plastic method

2020-10-26 , Mohd Sabri Hussin , Sanusi Hamat , Syamir Alihan Showkat Ali , Muhammad Aiman Ahmad Fozi , Yuzairi Abdul Rahim , Mohd Syedi Imran Mohd Dawi , Darsin M.

Fused Deposition Modeling is known as one of the 3D printing technology where it used a thermoplastic filament to produce a prototype or a 3D part. FDM will print out the 3D part, layer by layer on the platform of the 3D printer from bottom to top using the extruded molten thermoplastic. However, there is no information about the volume enclosed by the boundary surface of the 3D part by commonly used model data format such as STL file, since the volume enclosed can be completely or partially filled. Therefore, the study and research have been carried out to investigate the strength of the 3D part affected by the design of the infill pattern where three methods being used which are design, experiment and simulation. The 3D parts were designed using CATIA V5 following the ASTM D638 for tensile test and ASTM D695 for compression test. The 3D design was then being printed using the Fused Deposition Modeling (FDM) technique for experimental purposes and to perform the quasi-static test. Furthermore, the 3D printed with infill pattern test data were then being imported to ABAQUS/Explicit software for non-linear finite element analysis using elasto-plastic approach. The best infill patterns that exhibit a better strength after the 100% fill part is the 30% fill Lines pattern. It can be concluded that the average percentage error of stress and strain values between experimental test and simulations in tensile and compression for all specimens is below than 10%.

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Design and development of integrated transplanter and weedermmachine for system of rice intesification (SRI) cultivation in Malaysia

2015 , Mohd Syedi Imran Mohd Dawi

System of rice intensifications (SRI) was practiced by community in Lembah Organik Lentang, Kampung Lentang since 2010. Throughout the years, the paddy plots began to grow in number. Since most of the SRI practices needed to be done manually especially planting the seedlings and using conventional tools to kill weeds and loaming the soil, the demand of machinery was inevitable. This is due to time consumed and numbers of manpower needed to carry out the task. For example, weeding process need to be done 4 times for one season. A new chassis that is able to support mechanical weeder and transplanter for SRI was developed. This project was designed to support SRI practices among Malaysian farmers. Product design specifications were gained from rice farmers situated at Kampung Lentang, Belantek, Kedah. Several concepts were generated and the best was choosen for further development and analysis. New chasiss was developed to replace the current agriculture tractor. The chassis was fit with small petrol engine and one main wheel. It was designed to pull SRI weeder and transplanter mechanism. The weeder mechanism was designed to loam three rows at once and able to be use for weeding process up to 40 days of age. Finite element analysis software was used to identify potential failures and subsequent rectification of the problem at the design stage. Some calculation was done to determine force and torque that may act on design. Steel was chosen as material to reduce fabrication cost. Stainless steel and aluminum were also initially considered as suitable material for the design but was not chosen due to the cost is high. For the rice transplanter, the transplanting mechanism uses linkage to drop rice seedlings on top of the soil. This fits the SRI practices for transplanting the young seedling. It is not just able to plant one seedling at one location but also plant the seedlings without removing it from nursery soil, thus, eliminate possibilities to injure the seedlings. Motion analysis was done to analyze the linkage movement. Finite element analysis also was done to determine maximum stress for each linkage part. Two of the designed products were built into prototype which are SRI Chassis and SRI Weeder and tested in actual working environment at paddy field. The field trial shows SRI Weeder was able to reduce manpower by 67%, working time by 42% and save 60% of overall operating cost.

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