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Mach Elements Midterm1-Spring 2005

# Mach Elements Midterm1-Spring 2005 - d SAE 1040 steel CD...

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Department of Mechanical Engineering, Yeditepe University ME 342 MACHINE ELEMENTS I MIDTERM EXAM I, Spring 2005 NAME:______________________________________________________ Q.1. (10) For an unknown cast iron, the following data were determined in experiments. The density is about 7100 kg/m 3 , the Brinell hardness is about 230. a) Estimate the ultimate tensile strength in MPa.____________________________ b) Determine the compressive strength in MPa of the closest ASTM grade gray cast iron._____________________________________________________________ Q.2. (20) Determine the yield-strength-to-weight-density ratio (in) for the following materials. a) AISI 4140 steel quenched and tempered at 1000 ° F._______________________ b) Wrought Aluminum 3003-H16 _______________________________________ c) Titanium alloy Ti-13 V-11 Cr-3 Al ____________________________________

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Unformatted text preview: d) SAE 1040 steel CD ________________________________________________ Q.3. (25) For the following stress element MPa MPa MPa xy y x 10 , 5 , 15-= =-= τ σ . a) Show the stresses on the cubic element. b) Determine the principal stresses with correct indices. c) Determine the angle φ of one of the principal directions, and show all stresses on the rotated cubic element. d) Determine the maximum shear stress. e) Determine all the stresses on a cut surface as shown. x y φ 30 ° Q.4. The loads in a circular cross-section of a beam are shown in the figure. The diameter of the beam is 10 mm. a) (5) Name and identify the loads (the shear load is due to bending) b) (2*20) Determine the principal stresses at points A and B. c) (Bonus 5) Determine the principal stresses at point C, 3-mm from the centroid. A B 1 kN-m 2 kN-m 3 kN-m 2 kN 45 ° C...
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Mach Elements Midterm1-Spring 2005 - d SAE 1040 steel CD...

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