Second Exam(S08)

# Second Exam(S08) - The Hashemite University Faculty of...

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The Hashemite University Machine Design I Faculty of Engineering Spring 2008 Mechanical Engineering Department Instructor: Dr. Ala Hijazi Second Exam Name: _____________________ Part I – Closed Book Student #: __________________ Please Read Questions Carefully – Good Luck! (15 points) 1. For the flowing statements circle the correct answer. A steel part is subjected to a fully reversed fatigue stress where the magnitude of the stress is S ut σ S e . Which of the following is true? a) The part will have infinite life. b) The part will fail during the first loading cycle. c) The part will fail after a certain number of cycles. d) The static factor of safety is larger than one. The value of the fatigue stress concentration factor (K f ) is: a) 1 K f 0 b) K t K f 0 c) K t K f d) K t K f The Von-Mises stress will be equal to zero when a) σ x = σ y 0 and σ z = τ xy = τ yz = τ zx = 0 b) σ x 0 and σ y = σ z = τ xy = τ yz = τ zx = 0 c) τ

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Second Exam(S08) - The Hashemite University Faculty of...

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