Exam 1 2012

# Exam 1 2012 - UNIVERSITY OF CALIFORNIA AT BERKELEY FALL...

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UNIVERSITY OF CALIFORNIA AT BERKELEY DEPARTMENT OF CEE FALL SEMESTER, 2012 Instructor: P.J. M. Monteiro Name: ____________________ CE 60 – EXAMINATION Please justify all your answers Question 1 (23 points) I) Carefully draw the following crystal structures: BCC, orthorhombic, and monoclinic. (9 points) II) Draw direction vectors in unit cubes for the following cubic directions: a) 212 Ρ Τ Σ Φ , 123 Ρ Τ Σ Φ , 223 Ρ Τ Σ Φ (9 points) III) Steel can undergo two types of structural changes associated with phase changes. One is diffusive and the other is displacive. The formation of martensite is an example of _________ displacive ______ transformation (5 points) BCC orthorhombic monoclinic II)

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Question 2 (32 points) I) In a laboratory test, a metal rod of initial diameter 4.00mm and gauge length 200mm is tested under tensile loading. At 628N, the rod yields and at 400N, the gauge length is increased to 210mm. Compute: a) the yield stress of the metal, and b) the true strain at 400 N (8 points) II) Consider the phase diagram below. An alloy containing 40%Ag is slowly
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