課程名稱︰材料力學 課程性質︰必修 課程教師︰王安邦 開課學院：工學院 開課系所︰化工系 考試日期（年月日）︰2012/12/4 考試時限（分鐘）：100分鐘 是否需發放獎勵金：是 （如未明確表示，則不予發放） 試題 : 1.a 1/2-in.diameter alloy-steel(E=30000ksi) bolt passes through a cold-rolled brass(E=15000ksi) sleeve is 0.375 in^2. Determine the normal stresses produced in the bolt and sleeves by tightening the nut 1/4 turn(0.004 in.) 圖http://ppt.cc/wgH- 2.after a load P=150kN is applied to the pin-connected structure shown in the right figure, the temperature increases 100 C for the aluminum alloy rod A and 12x10^-6/oC for the steel rod B. The moduli of elasticity of aluminum and steel are 75GPa and 200 GPa,respectively. The cross-sectional area of members A and B are 1000 mm^2 and 500 mm^2,respectively. If member CD is rigid, determine(a) the normal stresses in bars A and B (b)the vertical component of displacement of point D 圖http://ppt.cc/YgvN 3.a stand pipe 12ft in diameter and 50ft tall is be4ing constructed for use as a storage tank for water with a specific weight of 62.4 lb/ft^3(see the figure below). The wall thickness of the vessel is 0.5 in. Determine the axial and hoop stresses at a point 10 ft above the bottom of the vessel. Neglect stress concentrations. 圖http://ppt.cc/jDYs 4.a motor provides 180kW of power at 400rpm to the drive shafts shown in the figure below. The maximum shearing stress in the three solid steel(G=80GPa) shafts must not exceed 70 MPa. Gears A,B,and C supply 40kW,60kW,80kW,respectively to operating units in the plant. Determine (a) the minimum satisfactory diameter for shaft D (b) the minimum satisfactory diameter for shaft E (c) the minimum satisfactory diameter for shaft F 圖http://ppt.cc/TKjp 5.a 50-mm-diameter steel (E=200GPa and v=0.30) bar is subjected to a tensile load P and a torque T, as shown below. Determine the axial load P and the torque T if the strains indicated by gages a and b on the bar areεa=1414μm/m and εb=-212μm/m 圖http://ppt.cc/F8Hg --

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