MOS Exam 1 06

MOS Exam 1 06 - 1) The bar DBA is rigid and is originally...

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Unformatted text preview: 1) The bar DBA is rigid and is originally held in the horizontal position. When the weight W is supported from D, it causes the end D to displace downward 0.025 in. ' 3) Determine the strain in wires CD and BE. b) If the wires are made of A-36 Steel (E=29,000 ksi ) and have cross-sectional area of 0.02 inz, determine the weight W. c) Determine the required diameter for the pin in double shear at A with a factor of safety of 2.0 against yield if the shear stress at yield is 24 ksi. 3: a: E = f. s e PrE ’4 HE, P: 6 A2 . . _ N: a‘6x15q(o.ol)(zq,glg3) : (DAWSW 14‘” (H503) ___T_____;L "f" Fly =%~1lb (Tm: gyms. — E A = O§OOQO3mL : O» Ojllo I.b’l 2) The support consists of three rigid plates, which are connected together using two symmetrical placed rubber pads. If a vertical force of 50 N is applied to plate A, determine the approximate vertical displacement of this plate due to shear strains in the rubber. Each pad has cross- sectional dimensions of 30 mm and 20 mm. Use G=0.2 MPa for rubber. areas-Mva- 5'” q ' 83> 6/r 34%) 45$ "m" 7‘ noi- SW . may: :5: {pH-93° '40 3) The rigid block has weight of 80 kips and is to be supported by posts A and B, which are made of steel (E=29,000 ksi, a=6x10'6/°F), and the post C which is made of red brass (E = 14,600 ksi, a=9.8x10'6/°F). If all the posts have the same original length before they are loaded, determine the average normal stress developed in each post when post C is heated so that its temperature is increased by 20°F. Each post has a cross-sectional area of 8 inz. f—chm PCSt C +0 lamb LL70 loudest 53551359qu PA = P3. _ ZPA-+P¢=8© CD Cog/Bakdogéj gap ._-_- I.%xlo'“’2. -+ SAP PC'J/ z l-qb x10. )44 M {79 (WW) I cameo) 4) The two shafts are made of A-36 steel (E= 200 GPa, G=80 GPa ). Each has a diameter of 25 mm and they are connected using the gears fixed to their ends. Their other ends are attached to fixed supports atA and B. They are also supported by bearings at C and D, which allow free rotation of the shafts along their axes. If a torque of 500 N-m is applied to the gear at E as shown, determine the reactions at A and B. govmgflgm / "= n] ‘l r I \/ 4 TA 4— F (I00) = 500 7‘ '0 g: . 500 Nm 3 (D ...
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MOS Exam 1 06 - 1) The bar DBA is rigid and is originally...

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