Prof. Mohammad Sukri Bin Mustapa
Universiti Tun Hussein Onn Malaysia, Malaysia
Speech Title: Metal recycling: potential of recycled aluminium alloy chips in solid-state recycling
Abstract: The global engineering activities nowadays are focusing on green and eco-friendly innovations. Solid-state recycling, which involves direct recycling of metal scrap into bulk material using severe plastic deformation has emerged as a potential alternative to the conventional remelting and recycling techniques. Hot extrusion process has been identified as a novel direct recycling technique which could reduce the energy consumption but still maintaining the excellent material performance. A potential study of operating temperature and holding time toward the mechanical and surface integrity of aluminium alloy AA6061 chips prepared by solid-state recycling using hot extrusion process is practically investigated. The optimum sample of the mechanical treated properties is selected to investigate the fatigue life performance. The research successful demonstrated that the fatigue life endurance and mechanical properties of directly recycled aluminium alloy AA6061 chips have been improved.
Assoc.Prof. Ahmad Baharuddin
Universiti Sains Malaysia, Malaysia
Speech Title: Hole integrity of carbon fiber reinforced epoxy composites using combined punching and drilling techniques
Abstract: Drilling is the most common technique in hole making of composite panel. But due to wear, quality of the produce hole is severely affected. From previous study, punching was proposed. Wear problem is not an issue in punching, however, hole quality become the major issue. This experimental study aims to investigate the quality of hole prepared via conventional drilling technique and the combined technique (punching + conventional drilling) on carbon fiber reinforced polymer (CFRP). The effect of the both hole making techniques (combined technique and conventional drilling) to the hole quality and performance were evaluated by conducting experimental based on surface roughness and bearing strength. The surface roughness measurement was performed over a sampling length of 3.6 mm along at the four quadrant points of the hole wall. A bearing test a was conducted according to ASTM D5961 Procedure-A double shear with single-pin fastener using modified fixture. The failure modes resulting from an experiment are quantified and compared to literature. The results confirm that the use of the combined technique in hole making on CFRP is almost similar to the conventional drilling alone in terms of bearing strength and failure mode as well as surface roughness.