TAILIEUCHUNG - TRIBOLOGY - LUBRICANTS AND LUBRICATION_2

Tham khảo sách 'tribology - lubricants and lubrication_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 2 Lubrication Tests and Biodegradable Lubricants 6 Experimental Evaluation on Lubricity of RBD Palm Olein Using Fourball Tribotester Tiong Chiong Ing1 Mohammed Rafiq Abdul Kadir2 Nor Azwadi Che Sidik3 and Syahrullail Samion3 1School of Graduates Studies Universiti Teknologi Malaysia 2Faculty of Biomedical Engineering and Health Science Universiti Teknologi Malaysia 3Faculty of Mechanical Engineering Universiti Teknologi Malaysia Malaysia 1. Introduction Tribology is defined as the science and technology of surface interacting in motion . Thus it is important for us to understand the surface interaction when they are loaded together as to understand the tribology process occurring in the system. The physical chemical and mechanical properties not only cause the effects to the surface material in tribology behavior but also the near surface material. Apart from that on the surface of the bulk material lies a layer formed as a result from the manufacturing process. This deformed layer is covered by a compound layer resulting of chemical reaction of metal with the environmental substance such as air. In addition the machining process such as cutting lubricants to be trapped may also cause the deformed regions of the surface. The regions on the surface material can critically affect both friction and wear of metals. In addition the forces which arise from the contact of solid bodies in relative motion also affect both friction and wear. Thus it is important for us to understand the mechanics contact of solid bodies in order to evaluate the friction and wear on solid bodies. Solid bodies are subjected to an increasing load deform elastically until the stress reaches a limit or maximum yield stress then deform plastically Gohar and Rahnejat 2008 . Friction is known as resistance to motion. Friction can be categorized into five types which are dry friction fluid friction lubricated friction skin friction and internal friction. The friction forces are divided into two

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