[試題] 100上 王安邦 材料力學 第二次期中考
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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01/07 17:58, , 1F
01/07 17:58, 1F