SecondExam(F08_ - U T he H ashemite niversitv Faculty f E ngineering o p n e I[e c hani al Engine r i ng D e artm e I c E Second xam C losedB ook

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The Hashemite Universitv Faculty of Engineering I[e chani cal Engine e r ing De part me nI lllachine Design I Fall 2008 Instructor: Dr. Ala Hij azi Second Exam Name: KA V Part I - Closed Book Sludenl #: Please Read Queslions Carefully Good Luck! ()9 points) l. For the flowing statements circle the correct answer. Two identical bars, one is made of aluminum and the other is made of steel. The two bars are subjected to the same axial tensile force. The strain energy will be higher in the aluminum bar. Tlvo columns, is made ofsteel. two.columns have the same slenderness ratio. The endurance limit of a shaft will increase as its diameter increases. According to the maximum normal stress failure theory, the material will never fail under h)drostatic stress. A filleted bar, made out ofa ductile material, is subjected to static load. The critical ofthe bar will depend on fillet radius. CF OF ro ro) r@ A steel part to a fully reversed fatigue where rnagnitude of the stress is S,r : o > S.. Which of the following is true? a) The pan will have infinite life. b) The part u,ill fail during first loading cycle. c) The static lactor of safetl is larger than one. @ The fatigue factor ofsafety is less The surface finish of a machine element affects its Fatigue strength. b) Ultimate strength.
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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.

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SecondExam(F08_ - U T he H ashemite niversitv Faculty f E ngineering o p n e I[e c hani al Engine r i ng D e artm e I c E Second xam C losedB ook

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