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test2s202

# test2s202 - Home Introduction Policies Resources...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Test 2 Equations: σ =F/A, e=(l-lo)/lo, e=ln(l/lo), K= σ f ( π c) 1/2

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Q1. A sample of gage length 2 inches has received an elongation to 2.2 inches in tension and compressed to 1.818 inches in compression. The engineering stress is tension was 6 Mpsi and 6.2 Mpsi in compression. The area of cross section initially is 2 square inches. 1. The true stress in tension is a. 5.454 Mpsi b. 6.6 Mpsi c. 10 Mpsi (b ) 2. The true stress in compression is a. 5.636 Mpsi b. 6.6 Mpsi c. 10 Mpsi (a ) 3. The true strains in both tension and compression are a. not equivalent b. differ in magnitude c. equivalent (c ) 4. The engineering strains in both tension and compression are a. not equivalent b. differ in magnitude c. equivalent (b ) 5. The area of cross section of the sample in tension is a. 1.818 b. 2.2002 c. 4.4 (a ) 6. The area of cross-section of the sample in compression is a. 1.818 b. 2.2002 c. 4.4 (b ) Q2. A sample has been tested in plane strain fracture toughness test. A pre- crack of 1 cm lead to failure at a stress of 146.7 Mpa. A crack of twice the size is introduced in another sample of the same alloy. 1. The fracture toughness of the alloy in units of Mpa (m) 1/2 is a. 40 b. 2 c.26 (c ) 2. The stress at which the sample fails with the new crack size is a. 60.4 Mpa b. 140.2 Mpa c. 103.7 Mpa (c ) Q3. A sample has been subjected to steady state creep at a temperature of 600oC and the observed strain rate is 0.005 sec-1. The same sample when subjected to creep at 400oC showed a creep rate of 0.001 sec-1. 1. The activation energy for creep (k is the Boltzmann's constant) in the experiment is a. 8219.2 k b. 4719.6 k c. 2223 k (b ) 2. The temperature at which the creep is 0.0025 is a. 456oC b. 501oC c. 804oC ( b) Q4. In the given phase diagram below, label the phase diagram, apply the phase rule and identify the invariant point points and the invariant reactions.
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