lecture 24 - ME 330 Engineering Materials Lecture 24...

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Lecture 24 Composites Stephen D. Downing Mechanical Science and Engineering © 2001 - 2010 University of Illinois Board of Trustees, All Rights Reserved ME 330 Engineering Materials
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 1 of 31 This Lecture . .. ± Composite types ± Failure modes ± Damage Mechanisms
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 2 of 31 Remaining Schedule Lab Subject Date Final Review Dec 7 Tue Creep Dec 2 Th Corrosion Oxidation/Creep Nov 30 Tue Exam #2 Nov 18 Th NO LAB Corrosion Exam2 Review Nov 16 Tue Composites Nov 11 Th Polymers Nov 9 Tue
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 3 of 31 Making the Connection ± We have examined strength, deformation, creep, fracture, fatigue properties of metals, polymers, and ceramics ± Each have certain advantages/disadvantages ± Ceramics - high compressive strength, stiffness, creep resistance, light, good thermal properties, very brittle, poor tensile strength ± Metals - good tensile properties, good creep resistance, moderate fracture toughness, generally rather heavy, corrosion can be problem ± Polymers - ductile, light, often high fracture toughness, weak, poor creep properties, rate sensitive ± So, we want to combine the best of both worlds and create new materials. ± Principle of combined action - “better property combinations are fashioned by the judicious combination of two or more distinct materials” ± If we don’t do better than before, we don’t do it.
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 4 of 31 Some Common Examples ± Reinforced concrete ± Concrete poor in tension ± Steel bars carry tensile load ± Steel would buckle in compression ± Concrete takes much of compressive load ± Concrete is very formable, protects steel from corrosion ± Fiberglass composites ± Epoxy matrix with random glass fibers ± Boat hulls ± Corvette body ± Complex shapes can be made ± Lightweight ± Excellent corrosion resistance ± Also: ± Car tire - steel belted rubber ± Plywood - laminate with grain oriented at 0/90°
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 5 of 31 Composite Map
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 6 of 31 Particle Reinforcement Influences Concentration Size Shape Distribution Orientation
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 7 of 31 Particle Reinforcement p p m m c V E V E E + = m p p m p m c V E V E E E E + = Rule of Mixtures (Tungsten in Copper)
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ME 330 - Lecture 24 © 2010 Stephen Downing, University of Illinois at Urbana-Champaign, All Rights Reserved 8 of 31 Influence of Fiber Length c f c d l τ σ 2 * =
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lecture 24 - ME 330 Engineering Materials Lecture 24...

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