Muhammad Akmal Johar

Advances in High Temperature Materials for Additive Manufacturing

In todays technology, additive manufacturing has evolved over the year that commonly known as 3D printing. Currently, additive manufacturing have been applied for many industries such as for automotive, aerospace, medical and other commercial product. The technologies are supported by materials for the manufacturing process to produce high quality product. Plus, additive manufacturing technologies has been growth from the lowest to moderate and high technology to fulfil manufacturing industries obligation. Initially from simple 3D printing such as fused deposition modelling (FDM), poly-jet, inkjet printing, to selective laser sintering (SLS), and electron beam melting (EBM). However, the high technology of additive manufacturing nowadays really needs high investment to carry out the process for fine products. There are three foremost type of material which is polymer, metal and ceramic used for additive manufacturing application, and mostly they were in the form of wire feedstock or powder. In circumstance, it is crucial to recognize the characteristics of each type of materials used in order to understand the behaviours of the materials on high temperature application via additive manufacturing. Therefore, this review aims to provide excessive inquiry and gather the necessary information for further research on additive material materials for high temperature application. This paper also proposed a new material based on powder glass, which comes from recycled tempered glass from automotive industry, having a huge potential to be applied for high temperature application. The technique proposed for additive manufacturing will minimize some cost of modelling with same quality of products compare to the others advanced technology used for high temperature application.

Case Study of an Intelligent AMR Sensor System with Self-x Properties

Numerous research efforts have tried to mimic the capabilities of living organisms in performing self-monitoring and self-repairing denoted as self-x features to achieve robust and dependable systems. In sensor systems applications, self-x features carry the promise to deliver properties requested by standards organizations, e.g., the NAMUR[1], such as improved flexibility, better accuracy and reduced vulnerability to deviations and drift caused by manufacturing and the environmental changes. In this paper, the concept of self-x properties implemented on an Anisotropic Magnetoresistive AMR sensor system is investigated as a first case study to be carried on in MEMS implementations. The degradation of AMR sensor can occur when the sensor is exposed to the strong magnetic field shown by weak sensitivity of sensor and inaccurate measurement output. The self-x properties are required to monitor and recover the sensor performance by employing the compensating and flipping coils. The experimental result shows the recovering of sensor performance in terms of classification accuracy for vehicle recognition application by implementing the self-x features.

Feasibility study of Thermal Electric Generator Configurations as Renewable Energy Sources

Thermoelectric Generator is a solid state device that able to convert thermal energy into electrical energy via temperature differences. The technology is based on Seebeck effect that was discovered in year 1821, however till now there is no real application to exploit this capability in mass scale. This research will report the performance analysis of TEG module in controlled environment of lab scale model. National Instrument equipment and Labview software has been choosen and developed to measure the TEG module in various configurations. Based on the experiment result, an additional passive cooling effort has produced a better ΔT by 7°C. The optimal electrical loading of single TEG is recorded at 200Ω. As for circuit connections, series connection has shown superior power output when compared to parallel connection or single TEG. A series connection of two TEGs has produced power output of 416.82μW when compared to other type connections that only produced around 100μW.

Development of Mould of Rheology Test Sample via CadMould 3D-F Simulation

This research was about the development of mould for rheology test sample via simulation. The development work concerned with stages of design, simulation, analysis, and fabrication of the mould to produce good quality samples. In the design stage, three mould concepts have been prepared via Solid Works software. The simulation of injection moulding was conducted by using CadMould 3D-F software. Then, in the analysis stage, the main factor that has been studied were the cavity system, runner system and the gating system. For each design, different type of systems were applied to compare different simulation result. Through the simulation software, it was rectified that the parameter such as the number of cavities, filling time, shear stress were the main factors to contribute good rheological properties of the sample. The final result shows that Design 2 was chosen as the suitable mould due to number of cavities and good results in the analysis, as compare to other mould design. Finally, Design 2 have been fabricated and undergo fitting test to see whether the dimension had been done correctly. Based on this research findings, it was proven that to develop a mould suitable for rheology sample, the mould design selection should be made based on the type of system in simulations.

Review on Advances of Functional Material for Additive Manufacturing

The attempt of finding and making new materials in improving products that are already in the market are widely done by researchers nowadays. This project is focusing on making new materials for functional material through additive manufacturing application. The idea of this project came from the ability limitation of capacitor in market nowadays in storing higher charges but smaller in size. Powder glass is the new material that could to be used as a dielectric material for capacitor with the help of palm kernel oil as the binder. This paper reviews on applications done through additive manufacturing method and also types of functional materials used in this method previously. Structure of a capacitor, dielectric properties and measurement techniques that are trying to be carried out are also explains in this paper. Last part of this paper brief on the material proposal and reasons those materials are chosen. New dielectric material for capacitor which are able to store more charges but still small in size are expected to be produced as the outcome of this research.

Comparative performance study of smart structure for thermal microactuators

Thermal microactuator is one of earliest types of microactuators. Typical thermal actuators are in the form of Bimorph and Chevron structures. A bimorph thermal actuator has a complex movement direction, in arc motion and thus it is not feasible in the most MEMS designs. While Chevron actuator has a tendency to produce an off-plane movement which lead to low precision in lateral movement. A new thermal actuator design in the form of serpentine structures shows promising feature to have better performances in terms of more predictive lateral movement with smaller off-plane displacement. In MEMS chip design, areas play a critical role as it will impact with the cost of the final product. In this study, four different structures of thermal actuator were simulated using ANSYS v15. Three different set of area sizes which are 240 µm x 1000 µm, 240 µm x 1500 µm and 240 µm x 2000 µm have been analyzed. All four structures were named as Serpentine01, Serpentine02, Bimorph and Chevron. The data with regards to temp...