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Summary engineering assignment 2 unit 10

You will receive 8 pages fully detailed assignment answer to the following question: P3 Describe mechanical, physical, thermal and electrical and magnetic properties and state one practical application of each property in an engineering context P4 :Describe the effects on the properties and behaviour of processing metals, polymers, ceramics and composites and of post-production use of smart materials. P5Use information sources to select a different material for two given applications, describing the criteria considered in the selection process. D1:Justify your selection of an engineering material for one given application describing the reasons the selection meets the criteria. Describe a different process of degradation associated with each of metals, polymers and ceramics. Part of Assignment 2 - Failure and Degradation of Engineering Materials BTEC Level 3 Extended Diploma in Engineering: Unit 10 – Properties and Applications of Engineering Systems Know the structure of and classify engineering materials Atomic structure: element; atom eg nucleus, electron; compound; molecule; mixture; bonding mechanisms eg covalent, ionic, metallic Structure of metals: lattice structure; grain structure; crystals; crystal growth; alloying eg interstitial, substitutional; phase equilibrium diagrams eg eutectic, solid solution, combination; intermetallic compounds Structure of polymeric materials: monomer; polymer; polymer chains eg linear, branched, cross-linked; crystallinity; glass transition temperature Structure of ceramics: amorphous; crystalline; bonded Structure of composites: particulate; fibrous; laminated Structure of smart materials: crystalline; amorphous; metallic Classification of metals: ferrous eg plain carbon steel, cast iron (grey, white, malleable, wrought iron), stainless and heat-resisting steels (austenitic, martensitic, ferritic); non-ferrous eg aluminium, copper, gold, lead, silver, titanium, zinc; non-ferrous alloys eg aluminium-copper heat treatable – wrought and cast, non-heat-treatable – wrought and cast, copper-zinc (brass), copper-tin (bronze), nickel-titanium alloy. Classification of non-metals (synthetic): thermoplastic polymeric materials eg acrylic, polytetrafluoroethylene (PTFE), polythene, polyvinyl chloride (PVC), nylon, polystyrene; thermosetting polymeric materials eg phenol-formaldehyde, melamine formaldehyde, urea-formaldehyde; elastomers; ceramics eg glass, porcelain, cemented carbides; composites eg laminated, fibre reinforced (carbon fibre, glass reinforced plastic (GRP)), concrete, particle reinforced, sintered; smart materials eg electro rheostatic (ER) fluids, magneto-rheostatic (MR) fluids, piezoelectric crystals. Classification of non-metals (natural): eg wood, rubber, diamond Know material properties and the effects of processing on the structure and behaviour of engineering materials Mechanical properties: strength (tensile, shear, compressive); hardness; toughness; ductility; malleability; elasticity; brittleness Physical properties: density; melting temperature Thermal properties: expansivity; conductivity Electrical and magnetic properties: conductivity; resistivity; permeability; permittivity Effects of processing metals: recrystallisation temperature; grain structure eg hot working, cold working, grain growth; alloying elements in steel eg manganese, phosphorous, silicon, sulphur, chromium, nickel Effects of processing thermoplastic polymers: polymer processing temperature; process parameters eg mould temperature, injection pressure, injection speed, mould clamping force, mould open and closed time Effects of processing thermoplastic polymers: polymer processing temperature; process parameters eg mould temperature, injection pressure, injection speed, mould clamping force, mould open and closed time Effects of processing thermosetting polymers: process parameters eg moulding pressure and time, mould temperature, curing Effects of processing ceramics: eg water content of clay, sintering pressing force, firing temperature Effects of processing composites: fibres eg alignment to the direction of stress, ply direction; de-lamination; matrix/reinforcement ratio on tensile strength; particle reinforcement on cermets Effects of post-production use: smart materials eg impact (piezoelectric), electric field (electro-rheostatic), magnetic field (magneto-rheostatic), temperature (shape memory alloys), colour change (temperature or viscosity) Be able to use information sources to select materials for engineering uses Information sources: relevant standard specifications eg British Standards (BS), European Standards (EN), International Standards (ISO); material manufacturers’ and stockholders’ information eg data sheets, catalogues, websites, CD ROMs Design criteria: properties eg mechanical, physical, thermal, electrical and magnetic; surface finish; durability eg corrosion resistance, solvent resistance, impact resistance, wear resistance Cost criteria: initial cost eg raw material, processing, environmental impact, energy requirements; processing eg forming, machining, casting, joining (thermal, adhesive, mechanical); quantity; mode of delivery eg bulk, just-in-time (JIT); recycling Availability criteria: standard forms eg sheet and plate, bar-stock, pipe and tube, sectional, extrusions, ingots, castings, forgings, pressings, granular, powder, liquid Know about the modes of failure of engineering materials Principles of ductile and brittle fracture: effects of gradual and impact loading eg tensile, compressive, shear; effects of grain size; transition temperature; appearance of fracture surfaces Principles of fatigue: cyclic loading; effects of stress concentrations eg internal, external; effects of surface finish; appearance of fracture surfaces Principles of creep: primary; secondary; tertiary; effects of temperature; strain versus time curve; creep limit; effect of grain size; effect of variations in the applied stress Tests: destructive eg tensile, hardness, impact, ductility, fatigue, creep; non-destructive eg dye penetrant, ultrasonic, radiographic (x-ray, gamma ray), magnetic powder, visual Degradation processes: on metals eg oxidation, erosion, stress corrosion; on polymers eg solvent attack, radiation and ageing; on ceramics eg thermal shock, sustained high temperature

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