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Unformatted text preview: ME306 Mechanics of Materials Spring 2009-2010, Lec 002 Midterm Exam– PRACTICE Instructions: Please write legibly and present well organized, logical solutions. ALL FINAL ANSWERS MUST BE EXPRESSED WITH APPROPRIATE UNITS where applicable. Problem 1: (30 points) (a) Explain why a wide flange beam has a greater resistance to bending as compared with a rectangular beam having an equivalent cross sectional area. Provide a sketch and/or equations to support your answer. (b ) Define anticlastic curvature, clearly supporting your answer with an appropriate equation or diagram. For a typical engineering material (positive Poisson’s ratio) how does the magnitude of the anticlastic curvature compare with that of the curvature of the neutral surface? (c) A cylindrical test specimen of a typical ductile material is subjected to a centric tensile load during a stress-strain test. After failure, it is observed that rupture has occurred along a cone-shaped surface, with the surface forming an angle of roughly 45° with respect to the axis along which the load was...
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- Spring '10