Note that the microstructure-synthesis and processing-composition are all interconnected and affect the performance-to-cost ratio 5 emg 2201 engineering materials lecture notes. Tests: pledged, closed-book and closed-notes Grading: W. D. Callister & D. G. Rethwisch, Materials Science and Engineering: An Introduction (John Wiley 2010, 8th edition) I will also post my lecture notes on the web. 2 2.008 spring 2004 S. Kim excerpt from Prof. J. Greene, CSU 7 Medical Plastics and Composites Use Containers Bottles, bags Drug delivery IV bags, syringes tubing and tools for surgery Implants, artificial skins The use of plastic materials in the medical field, about 4 billion dollars in … MECHANICAL/MARINE ENGINEERING 2014/15 SEM I LECTURER MR. J. MUTUA 1 Heat treatment of plain carbon steels Surface Hardening Toughness of a materials decreases as hardness and strength increases. At the plastic hinge Plastic bottle caps are often made from PP. and engineering plastics (acrylic, nylon, acetal, etc.). The book incorporates material properties, engineering, processing, design, applications and sustainable and bio based solutions. stress (perform like a plastic) B= Yield strength (point B in fig. Polystyrene is commonly recycled, but is difficult to do. Note that once the plastic moment capacity is reached, the section can rotate freely – that is, it behaves like a hinge, except with moment of P M at the hinge. Textbook: Code 7 is used to designate miscellaneous types of plastic … a) – The maximum engineering stress before rupture – Different from the true stress due to … Items such as disposable coffee cups, plastic food boxes, plastic cutlery and packing foam are made from PS. •ABS plastics generally possess medium strength and performance and medium cost. After passing the elastic limit (point A in Fig. b) – Stress that will induce permanent set (an offset to the original length) – In fig. This is termed a plastic hinge, and is the basis for plastic analysis. Ideal for those just entering the industry, or transitioning between sectors, this is a quick, relevant and informative reference guide to plastics engineering and processing for engineers and plastics practitioners. b, line OC = the offset, line BC is parallel to OA Ultimate strength (see in fig. YEAR 2 BSc. 8.1.1), the material “gives” and is said to undergo plastic flow. In the elastic range the force-displacement behaviour for most engineering materials (metals, rocks, plastics, but not soils) is linear. Plastic analysis is the method through which the actual failure load of a structure is calculated, and as will be seen, this failure load can be significantly greater than the elastic load capacity. Further increases in prescription bottles. 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