Ts. Dr. Muhammad Al' Hapis Abdul Razak

University of Kuala Lumpur | unikl · Malaysian Spanish Institute

Bulk metallic glass demonstrates superior mechanical properties and excellent bio-mechanical stability compared to routinely used biomaterials like titanium, cobalt-chromium, stainless steel, et cetera. However, the metallic glass surface do not easily adhere to the leaving tissues due to native bio-inert oxide layer, which have poor wear resistanc...

This paper presents the experiment results to identify the contamination control with hydraulic oil used over 250 tons of Hitachi hydraulic excavator works on coal mining operations. The nature of this topic is to analyze the effectiveness off-board filtering systems by using different sizes of micron rating filters in a specific time interval to r...

The historical development of fire suppression technology evolved in the 1930s since the application of Halons as a fire extinguishing agent. The fire may cause tremendous losses to organizations. It affects the chain of businesses and the stability of the economic growth of a country. The key issues of greenhouse effects and safety and health as w...

Powder mixed-electro discharge machining (PM-EDM) is a new emerging trend in research on electro-thermal process that can simultaneously shape and deposit a coating on the surface of the workpiece. PM-EDM is a hybridized form of EDM in which metallic powders are amalgamated in dielectric liquid to enhance both the machined surface condition and mac...

This paper presents the kinematics of a six-bar linkage which magnifies the magnitude of linear motion. A designed mechanism eliminates the problem of long bellow lengths in bellow valves which makes the valve design aesthetically more suitable for industrial applications. The mechanism is a planer linkage with a single degree of freedom where a st...

Aseptic loosening and stress shielding are the most common causes of implant failure after total knee and hip arthroplasty. Failure is due to difference in mechanical properties of natural bone and artificial implants. Porous structures provide the solution to this problem and are being used in implants to avoid failure. The purpose of this researc...

Powder metallurgy is one of the promising techniques for producing different metals and their alloys. The uniqueness of this technique owes to its processing parameters that can be optimized to produce a desired material with tailored physical and mechanical properties. Among the available biomaterials, the austenitic stainless steel 316L has been...

The evolution of silicon carbide (SiC) ceramics has recently attracted the interest of several researchers due to their industrial applications. Nonetheless, the shaping of SiC is quite challenging using conventional techniques due to its extreme hardness, high thermal stability and high brittleness characteristics. This study attempts to shape a m...

This study attempts to simultaneously machine and synthesize a biomimetic nanoporous hydroxyapatite coating on the Zr67Cu11Ni10Ti9Be3 bulk metallic glass (BMG) surface. The aim is to investigate and optimize the hydroxyapatite deposition rate and the surface roughness during the electro-discharge coating of Zr67Cu11Ni10Ti9Be3 BMG. Scanning Electron...

This research investigates the simultaneous sintering and surface nitriding of 316L stainless steel alloy using powder metallurgy method. The influence of sintering temperature and dwell time are investigated for maximum nitrogen absorption, densification and increased microhardness using response surface methodology (RSM). In this study, 316L stai...

The conventional electro-discharge machining (C-EDM) method with low material removal rate (MRR) and high electrode wear rate (EWR) results in high production costs. The C-EDM also suffers from inconsistent machined surface quality and the formation of micro cracks and craters on the machined surface. The objective of this article is to review the...

Biodegradable materials are required for the development of bone fixation accessories. Mg was recently identified to be biodegradable material and a better alternative for temporary implants application. However, the Mg alloy corrosion rate must be suitable for the application as biodegradable orthopedic implants. Controlling the Mg alloy corrosion...

Biomedical implant can be divided into permanent and temporary employment. The duration of a temporary implant applied to children and adult is different due to different bone healing rate among the children and adult. Magnesium and its alloys are compatible for the biodegradable implanting application. Nevertheless, it is difficult to control the...

Surface treatment remained a key solution to numerous problems of synthetic hard tissues. The basic methods of implant surface modification include various physical and chemical deposition techniques. However, most of these techniques have several drawbacks such as excessive cost, surface cracks and require very high sintering temperature. Additive...

Magnesium alloy is highly potential material for biodegradable implant application. Due to limitations in conventional machining methods, non-traditional machining method such as electrical discharge machining (EDM) die sinking process is proposed to produce intricate shape with tight tolerance on magnesium alloy. Nine EDM experiments with three le...

The electrical discharge machining (EDM) process is an excellent method to machine with the high geometrical accuracy required for bio-medical implants. In implant fabrication, a higher surface roughness has led to a huge contact surface area which causes a higher corrosion rate. Uneven spark distribution in conventional EDM (C-EDM) has led to nega...

The development of implants in biomedical engineering application nowadays requires materials with good mechanical and physical properties. Conventional machining of high strength alloy materials is a challenge. Non-conventional machining processes such as electrical discharge machining (EDM) of high strength material have its limitations. Among th...

Fasteners are a type of relationship which can have a significant impact on the assembly time of the system. Interference Press-fit Aluminum Nut (INPRENUT) is press-fit fastener designed to reduce pre-assembly setup time, preassembly setup time, disassembly time, reduce sharp object hazard and improve the quality of the product developed. Therefore...

This paper presents the static analysis of 18-slot/16-pole Permanent Magnet Synchronous Motor (PMSM) using Finite Element Analysis. The motor is designed from half model of rotor and stator. Then it is built until becoming a complete motor. The stator and rotor core are made from silicon steel laminations, and Neodymium magnets is used for permanen...

Machining cost for electro-discharge machining (EDM) is high due to longer machining time. EDM efficiency is hypothesize can be increased using powder-mixed dielectric fluid (PMEDM). PMEDM works gradually at low pulse energy and distributes evenly the powder in machining area. PMEDM may lead to improve machined part surface finish, improve material...

This study employed the Taguchi approach in combination with finite element analysis (DEFORM3D) to investigate face milling process onto AL6061. The factors studied in this investigation were cutting speed, feed rate, and axial rake angle. The simulation of flank wear was generated according to Usuis wear model though the L9 (34) of the orthogonal...

The purpose of this paper is to study the effect of current on performance of EDM process of Allegheny Ludlum D2 Tool Steel (UNS T30402). The effect of varying the machining parameters on the machining responses such as material removal rate (MRR), electrode wear rate (EWR), and surface roughness (Ra) have been investigated. In this study, circular...

This paper evaluates the feasibility of using parametric programming in the implementation of feature-based machining. Custom Macro B was used in this study. Macro programming technique comprises of a main program and subprograms. NC program for a basic type of machining feature namely pocket was first generated using macro and CAM system. Macro pr...

This paper presents an on-going research work on the implementation of feature-based machining via macro programming. Repetitive machining features such as holes, slots, pockets etc can readily be encapsulated in macros. Each macro consists of methods on how to machine the shape as defined by the feature. The macro programming technique comprises o...

This paper describes a research work to explore the utilization of macros in an effort to improve an overall machining efficiency. Latest models of CNC machine are equipped with many functions and resulting difficulty in creating NC program. Feature based machining is optimizing the capabilities of CNC machine. A novel framework of a feature based...

This paper describes a research work to explore the utilization of macros in an effort to improve an overall machining efficiency. Latest models of CNC machine are equipped with many functions and resulting difficulty in creating NC program. Feature based machining is optimizing the capabilities of CNC machine. A novel framework of a feature based...