ith UNT acae ey signing below, I acknowledge that I am aware of and will comply
ID: 2087885 • Letter: I
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ith UNT acae ey signing below, I acknowledge that I am aware of and will comply class in a zero assignment grade. Explain all work for any credit calculator policy. Exam is closed book, notes, internet, I-phone Name Select BEST choice: 1. (2) Three crack propagation types are a. sliding, beachmarks, opening b brittle fracture, microcracks, beachmarks c. opening, tearing, striations d. sliding, tearing, microcrack e. none of these loading condition do DET, MNS, and MSS produce the same a. Pure torque b. Combined bending and torque c. Pure transverse shear d. Pure bending e. None of these 3. (2) Necking occurs when machine a. has brittle materials just before fracture b. has mostly in cast iron, plastics, and ceramics c. experiences plastic deformation d. before yield, but after proportional elastic limit e. none of these 4. (2) metal fatigue failure occurs after many cycles provides no visible warning in advance of failure may appear to be brittle static fracture a. d. none of these e. all of these S. (2) MNS is unconservative when compared to MSS, especially a. true false 6. (2) Shaft vibration can be fixed by decreasing a. yield strength b. endurance strength c. distance between bearing supports d. diameter 7. (2) Mohr circle explains that shear stress is always maxim a. false b. trueExplanation / Answer
(1) (c)opening ,tearing and striation
(2) (c) Pure transverse shear
(3) (c) Expecience plastic deformation
(4)(e) All of these
(5)Question not visible completely
(6) (c)Distance between bearing supports
(7)Question not visible completely
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