Practice%20exam3 - Materials Science and Engineering 280...

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1 Materials Science and Engineering 280 Practice Exam 3 Professor Moonsub Shim Time allowed: 3 hours Total Credit: 200 points Write your name on all pages (at least first initial and last name) . Answer all parts of all questions concisely and completely. Show your work for full credit. Problems have different values (Do not spend too much time on any given problem). This test is closed book, closed notes (You may use only the data given in this exam. You may not use your neighbor). If you use back pages of the exam, indicate so. If you use extra papers, make sure they are attached with your name on them. Including this cover page, there are 9 pages to this exam. Avogadro’s Number = 6.022 x 10 23 mol -1 Name: __________________________________________
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Name: ______________ 2 Deformation & Strengthening Resolved shear stress: λ φ σ τ cos cos R = Critical resolved shear stress: max y crss ) cos (cos = Hall-Petch Equation: Cold work: Failure Max stress at the crack tip: For long microcracks: Stress concentration factor: Critical stress for crack propagation: Fracture toughness: Plane strain fracture toughness: Cyclic stress crack propagation rate: m K A dN da ) ( Δ = For linear region: Δ = f o a a m m m m f a Y da A N 2 / 2 / ) ( 1 π Steady-state creep rate: = RT Q K c n s exp 1 ε Phase Diagrams Lever rule: L o L C C C C W = α ; L L o C C C C W = Phase Transformation Nucleation: Avrami eqn: Arrhenius eqn: %CW = A o A d A o x100 γ 2 3 4 3 4 r G r G v + Δ = Δ Δ = T T T H r m m f c 2 2 2 3 * 3 16 Δ = Δ T T T H G m m f πγ t o m t a K ρ 2 = = a Y K c c = a Y K Ic = 2 / 1 + = d k y o y ) exp( 1 n kt y = = RT Q A rate exp
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Name: ______________ 3 Composites Particle reinforced : Upper limit: p p m m c E v E v E + = Lower Limit: p p m m c E v E v E + = 1 Fiber composite
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This note was uploaded on 03/15/2010 for the course MSE 280 taught by Professor Johnson during the Fall '08 term at University of Illinois, Urbana Champaign.

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Practice%20exam3 - Materials Science and Engineering 280...

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