Helmi Rashid

On the crushing behavior of foam-filled composite tubes under compressive loading

The present papers determine the effect of composite pultrusion square tubes E-glass polyester empty and polymeric foam-filled subjected to axial compressive loading. The specimens of square composite pultrusion were compressed experimentally under axial loadings to examine the effect of empty and polymeric foam-filled with different wall-thickness. The wall-thickness was used in this study were 2.1 and 2.4 mm. During the experimental observation, three characteristic crushing stages were identified as initial peak load, progressive crushing and compaction zone stages. The composite pultrusion square tube profile were analyzed and investigated in terms of crashworthiness parameters to meet the improvement of structural material widely used in automobile, aerospace and marine applications. Result obtained from experimental analysis such that initial peak load, mean load, energy absorption and specific energy absorption versus displacement curves were compared for each specimen. Results showed that the tubes energy absorption was affected significantly by different tube profile. It is also found that the polymeric foam-filled exhibit superb crashworthy structure on specific absorbed energy and the amount of initial peak load, mean load and absorbed energy recorded higher than the empty tube profiles.

Anthropometric study of Malaysian youths - a case study in Universiti Teknologi Mara

Anthropometric data has become crucial when it comes to designing consumer products that involves ergonomic factors such as in health care and automotive areas. Most products are designed according to United States and European countries anthropometry data. The nearest anthropometry data we can refer to is Japan for Asian measurements. The continuous growth of youth population in Malaysia has created major demands in consumer products; hence it is important to have anthropometric data to represent this target user consumer. However, no specific data of young adults in Malaysia that could be obtained. The objectives of this research are to establish an anthropometric database for male youths (aged 19–24) and to analyze the data using descriptive statistic method in producing mean, percentiles and standard deviation (S.D) value for anthropometric variables. However for this study, youth samples are limited to Universiti Teknologi MARA(UiTM) students.The measuring process will be carried out according to Malaysian Standard 2003: MS ISO 7250:2003-Basic Measurement for Technological Design. [1] Result of the study will provide guidelines for product design and biomechanics applications that suit the Malaysian market and needs.

Conceptual Design of the Mechanical Transfer Lift: Through the Application of EDP And KE

The mechanical transfer lift is a device used to assist caretakers when transferring patients from one position to another. While using a manual transfer method, they need to extract a large amount of energy to transfer the patient; resulting in back pain and stress. From the engineering design process, the main objective of this research is to come out with the conceptual design of a transferring device; which is compatible to use in a hospital environment. The design should allow caretakers to transfer a patient with less work as possible, at the same time is easy to handle, portable and ergonomic. The details regarding each design concept have been highlighted and discussed accordingly. In the future, further improvement shall be applied towards the design during the preliminary and detail design stage.

New mouth spacer design for dental application

Mouth spacer is designed to keep the mouth open wide enough for the dentist during dental procedures. Designing and developing a mouth spacer that able to open mouth wide enough and limit the tongue movement is the main objectives for this paper. The new mouth spacer design is expected to reduce gums and jaws pain. This paper incorporates problem identification, idea generation and conceptualization stage in order to generate two design concepts for new mouth spacer designed. The mouth spacer conceptual design with dual function that complied with these project objectives was selected. This design was modeled by using of CATIA software and the suggested material is polyvinylacetate polyethylene (EVA) copolymer and application of silicone sponge gel on the side for patient comfort and satisfaction. The mock up design was prepared using RP machine to visualize the conceptual design. Above all, this paper gives detailed description function of the mouth spacer that may improve the dental surgery application towards a better procedure.

Dynamic Analysis of Frontal Human Skull Using Finite Element Simulation

The main purpose of the present study is to develop one degree of freedom of frontal human head impact test procedure using finite element simulation. This study is to compare the results between simulation and experimental result conducted by Delye et al. To conduct this study, the process involve is to develop finite element modeling of human skull and to analyze the data analysis which investigating the impact conditions of human skull during a human head impact on the resulting total deformation and stress distribution. There were geometric preparations, selection of elements, selection of materials, application of loadings, and the specification of boundary conditions.

Rotary car park (pallet design) computer aided design analysis study

The increment of vehicle in UiTM main campus had contributed to parking problem because of limited parking space. Hence, rotary parking system could be one of alternative solution. Since it is a big system, this research focuses only on the platform (where cars will be parked on top of it) upper pallet structure. Initial design process stage [1] (conceptual, embodiement and detail design) had been applied to develop CAD model of the parking system. The pallet CAD model are analyzed to predict stress and deflection. The result then are compared to design specifications and material properties to ensure the design is verified. Solidworks software is used for CAD modeling and CAE analysis.

Study on the possible defects in plastic injection molding for different designs of studs for football boot sole using CAD and CAE technologies and applications

Computer aided design (CAD) and computer aided engineering (CAE) technologies are extensively utilized nowadays to assist engineers and mold designers in the engineering world. These technologies and applications serves as vital tools to generate better, safer and more reliable products. Beside it saves a lot of time in the design process that includes modeling and drafting through the use of CAD technology, engineers and designers may also simulate their design to determine and predict the performance of the final product that will be manufactured through CAE technology. This research study outlines the utilization of these technologies in designing a football boot sole that will be used for plastic injection molding. In plastic injection molding, it is highly aimed to produce plastic products with no defects or at least less imperfection. Therefore, utilizing CAD and CAE technologies may contribute a high impact to the plastic injection molding industry whereby through simulation and analysis using CAD and CAE technologies, predictions of the possible defects on the final product can be made. ProE,GI,EER 2000i2 and MOLDFLOW Plastics Advisers (MPA) were the CAD and CAE technology applications that were widely used in this research study. Apart from that, the predicted defects on the final product managed to give a clear view to the research and design team about what defects may occur on the football boot sole design.

Numerical investigation of chocked converging-diverging nozzles for thruster application (normal shock wave)

Small scale spacecraft generally need low thrust and these characteristics lead to low Reynolds number flows from propulsive devices that utilize converging-diverging nozzle. In the present work, seven choked converging-diverging nozzle flow characteristics operating at Reynolds number of 46000 are numerically investigated using a commercial software FLUENT 6.1.22. A computational work is carried out using Spalart-Allmaras model, two-dimensional, axisymmetric, coupled solver and linearized using implicit scheme. The nozzles have a throat diameter of 11 mm, an area ratio of 4 and all six nozzles are derived from a nozzle with divergence angle of 28°, where the divergence angle is reduced while maintaining the area ratio. The main objective of this work is to investigate the performance and flow characteristic of nozzles with different geometry. Numerical findings show that there is thrust reduction observed as the divergence angle reduces from 28° to 10°, except for nozzle with divergence angles of 16° and 18°, where they produce thrusts higher than their derivative one. Also, it can be observed that the strength of the normal shock depends on the viscous loss, where an increase in viscous loss tends to reduce the normal shock strength.