SecondExam(F09)_Soln - T he H ashemiteU niversity Faculty f...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The Hashemite University Faculty of Engineering Me c hani c al Engine e ring Departme nt Machine Design I Fall 2009 Instructor: Dr. Ala Hijazi Second Exam PartI-ClosedBook Please Read Questions Carefully - Good Luck! (16 points) I . 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,, - r > S". Which of the following is true? a) The pan will fail during the first loading cycle. fS) The part will fail after a certain number ofcycles. i) The pan will have infinite life. d) The static factor of safety is larger than one. Which ofthe following failure theories can not be used for ductile materials? a) Maximum shear stress @ Maximum normal stress -c) Distortion energy d) Coulomb-Mohr The surface finish ofa machine element affects its a) Ultimate strength b) Yield strength Endurance limit d) All ofthe above e) None ofthe above The value ofthe fatigue stess concentration (K/ is: a) 1ZK7Z0 b) K,:K;zO r,u rr>t d) K, <K, The Von-Mises stress will be equal to zero when a) o,- orl0 artd o,: r,r: rn: t-:0 b) o, * 0 and or: o": tr: tr: t- = 0 c) tr l0 and o, or= o- tr= t^:0 None ofthe above e) All ofthe above Name: kz t, Student #: " -t
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A cantilever beam having a rectangular cross section as shown. A force F is to be applied at the free end. The strain energy in the beam @ will be higher if the force is applied in the direction ol tne ir axls. b) will be higher ifthe force in the direction of the y axis.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/25/2010 for the course MECHINCAL 2010 taught by Professor علاءحجازي during the Spring '10 term at Hashemite University.

Page1 / 6

SecondExam(F09)_Soln - T he H ashemiteU niversity Faculty f...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online