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SecondExam%28F08%29_Soln

# SecondExam%28F08%29_Soln - U T he H ashemite niversitv...

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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. Forthe 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 identical columns, one is made of aluminum and the other is made ofsteel. The 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 tensile load. The critical stress ofthe bar will depend on the fillet radius. C F O F r o r o ) r @ A steel part is subjected to a fully reversed fatigue stress where the 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 the firstloading cycle.

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