Unit 2 Materials Technology Categorizing Materials Dr Hatem

Unit 2: Materials Technology Categorizing Materials Dr. Hatem Elaydi Engineering Technical English Islamic University of Gaza Feb. 15, 2016

Braking System 2 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Language note You will find the following vocabulary useful in this section. �compound, exotic (material), ferrous, non-ferrous, ceramic, alloy, metallic, nonmetallic, polymer �consist of, comprise, made of, made from, made out of 3 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Green Brakes ecological: relationship between organisms and their environment 4 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Compound: combinations o f materials Exotic: rare or complex 5 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Ferrous: iron and steel Ceramics: minerals transformed by heat 6 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Glow: a steady radiance of heat dissipating: vanish 7 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Exploitation: making use of Alloy: mixture of metals Non-metallic: materials that are not metal Polymers: plastic materials 8 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Q 4. What do you know about braking systems? In pairs, discuss the following questions. 1. Generally speaking, what do brakes do and how do they work? 2. What kinds of material are used in brake pads and brake discs in different vehicles Suggested answers 1. Brakes are designed to slow down vehicles or moving parts. Often they work through friction, by applying pressure to pads which are pressed against the sides of a disc, the inside of a drum, or directly against a wheel rim. 2. Examples of materials used to make pads include: compounds of advanced materials (cars), ferrous metals (trains), rubber (bicycles), ceramics (performance cars). 9 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Q 5 5 a. Read the article on braking systems. In the title of the article, what do the colors green and refer to? Answers Green refers to ecological issues. Red refers to heat 10 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Q 6 a: Homework 6 a. You are going to give a talk on composites technology at a construction materials trade fair. In part of the talk, you focus on reinforced concrete as a well-known example of a composite material. Prepare your talk using words and phrases from this section and the following notes. � Composite materials � Common example: reinforced concrete(very widely used composite) cement( derived from lime) � Aggregate – fine aggregate(sand) + coarse aggregate(gravel or crushed stone) � Water + chemical additives (e. g. plasticizer to improve workability) � Reinforcement (steel bars, fixed together with steel tie wire) 11 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

6 c. Margit, a sales engineer, is describing a high-voltage cable. Before you listen, label the cross-section with the parts (a-e). a) insulation b) waterproof membrane c) outer jacket d) armored protection e) conductor Answer 1 c 2 b 3 d 4 a 5 e 12 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Q 6 c insulation = a protective material which does not conduct electricity waterproof membrane = thin layer of material which acts as a barrier to prevent water passing armored = covered with a very strong protective layer conductor = material which conducts electricity 13 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

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