Mos exam 1 03

# Mos exam 1 03 - 1. Two possible conﬁgurations for the...

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Unformatted text preview: 1. Two possible conﬁgurations for the assembly of ajoint in a bridge are to be evaluated. The two conﬁgurations with the forces are shown below. (a) Detemiine which joint assembly is preferred. (b) Assuming the radius of the pin is 0.5 in., what is the maximum shear stress in the pin for the preferred assembly? (c) If the ultimate shear strength of the pin is 40 ksi, calculate the minimum pin diameter for each assembly, which gives a factor of safety of 2.5. N(- = 20 hips NC. = 2()kip5 NR = IS kins . .. . mafia?) - 3'61: \ NR = IS Rips ‘ Np “-‘ 30 kips Assembly 1 Assembly 2 (03. {wok CL} «or slow Assam 8391 i Pc‘iSEMBD‘l 9— A Slit-HP fit/913%? V9.5?— lSLCLa? Vp<8 _ 20 ‘ ISLc-«p "—9 7/ / A -——}’is E- A “"—>lSlL—\f VBC: O VQgH P rag—e:de it LOLUSJL— 2. A solid cylindrical specimen of a material is tested to determine its structural properties. The specimen has a gage (or initial) length of 1.0 foot and has a diameter of 2 inches. Results of an axial loading test are shown in the table below, where 5 is the axial deformation observed when axial loading P is applied (P is a tensile load here), and 0 is the angle of twist observed for applied t0rque T (T is applied at one end of the specimen while the other end is held fixed). ' Graph these data and determine the modulus of elasticity. modulus of rigidity and Poisson ratio for this material. 3 (in) P ki S 0.0015 5 0.0876 1 0.0035 10 0.438 5 0.006 20 0.876 10 0.0085 30 1.752 20 0.012 40 2.628 30 / - P 0.0145 50 3.504 40 3 (*W (W5 -IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIII "IIIIIIIIIII-IIIIIIIIIIIIIIIIIII-EIIIIIIIIIIIIIII III-IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII -IIIIIIIIIIIIIIIIIIIIIIIIIIIIIEIIIIIIIIIIIIIIIIII 4O -IIIIIIIIIII-IIII-III...IllllﬂllllIIIIIIIIIIIIHHI -IIIIIIIIIIIIIIII-III...IllﬁlIIIIIIIIIIIIIIIIIMII IIIIIIIIIIIIIIIIIIIIIIIIIIIHIIIIIIIIIIIIIIIIIIHIII -IIIIII-IIIIIIIIIIIIII-IIII-III...IIIIIIIIIIHIIII -IllIII-IIIIIIIll-IIIIIEIIIIIIIIIIIIIIIIIIIKIIIII -IIIIII-lIIIIIIII-IIHEIIIllﬂlIIIIIIIIIIIIIKIIIIII 30 IIIIIIII-IIIIIIIII-II“...Illa:-III-IIIIIIIIIIIIIIII -IIIIIIIIIIIIIIIIIEIIIIIIII-IIIIIIIIIIIIIZIIIIIII —IIIIIIIIIIIIIIllﬂllllllIII-IIIIIIIIIIIIHIIIIIIII "IIIIII-lIIIIIlull-IIIIIIIIIIIIIIIIIIIIHIIIIIIIII -IIIIIIIIIII-lﬂlllllllllIIIIIIIIIIIIIHZJIIIIIIIIII 793 “II-II...IIlﬂﬂIIIIIIIIIIIEHIIIIIIIIIHIIIIIIIIIII IIIIIIII-IIIIIIIIIIIIIIIIIIIIIIIIIIIIHIIIIIIIIIIII IIIIIIIIIIIII-IIIIIIIIIIIIIIIIIIIIIIKIIIIIIIIIIIII IIIIllllliIIIIIIll-IIIIIIIIIIIIIIIIZIIIIIIIIIIIIII i0 III-IIIHGIIII-IIII-IIIIIIIIIIIIIIIIIIIIIIII-III... IIIIIQHIIIIII-IIIIIIIIIIIIlllﬂlIIIIIIIIIIIIIIIIIIII III-lIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIII IIIEIIIIIIIII-IIIIIIIllllIIIIIIIEIIIIIIIIIIIIIIIII IIHIIIIIIIIIIIIIII-IIIIIIIIIIIIHIIIIIIIIIIIIIIII-I III-III...Ill-IIII-IIIIIIIIIIIQIIIIIIIIIIIIIIIIIII o 0.002 000+ 0000 0.00% 0.0! t "t— & Sigi gdﬂéwsioggcﬁmm L...- “ _F ‘ AE/L‘E-r gt/{poiqsw gcﬁg MS 0’ ﬁ—F Egg . 1 :T‘- T _, TQ — SL0 gﬂ Sic? /¢ w '1: “Brief—:- 43 =|l Ll. melava 01W , L. g .. Ettost =n~l€=4 ((384) = Soot» tag; at: E Y E. ‘ 8: 321 MOTE— v is veg warm La.) A rectangular aluminum bar (E = 10,000 ksi), a steel bar (E = 30,000 ksi) and a brass bar (E : 15,000 ksi) form a structure as shown below. All the bars have the same thickness of 0.5 in. A gap of 0.02 in. exists before the load P is applied to the rigid plate. Assume the rigid plate does not rotate; Determine: (a) the axial stress in the steel (b) the displacement of the rigid plate with respect to the right wall. 9| K 0.02 in 6in EM” 0.} i=5? 5-5: =9 a. (Agra 'plotleaoen ma rota-Le) %s:%e, :— SaJ—ooz ch mgr CLOSE, @EFoRi BRASS? 5R STEEL—EEJCOKM - Mom COMPPFRB\LV\\‘ (‘) 0(§ 2 3b LBSLS féls _-F5Lg Ab=As AsEs AgEL, (’5 = 3% aw: L3 3 ——2 )LJ , 3’ S5,.” 3 (:3; -O‘OZ_ SE3 3 3 . 58’; * 2 (ELL—#35,, ‘001 (QXOSXBOIOOQ) (HOSWO/OOO) PS( “1” +9; )2 o‘oCyo-cn. )000 1000 - r7 2 0‘04 __, ' (y; 19. =IOKS} (0x3 S 0‘00% 1 CW 5 (O : LcJ Q9) 8d Pa) (.5 Mo» I 0 03m 4. A 100-hp motor is to drive a pulley and belt system as shown below. (a) If the system is to operate at 3600 rpm, determine the minimum diameter of the solid shaft AD, to the nearest US”, if the allowable shear stress in the shaft is 10 ksi, and the maximum allowable angle of twist is 2 degrees. Assume G = 10,000 ksi. (b) The bolts used in the coupling BC have an allowable strength of 12 ksi. Determine the minimum number of 1/1” diameter bolts that must be placed at a radius of 3.14". ShattLengt‘n. [_)a :ﬁt 8 m : (r1307) (58% )( o #7?) V BIN, ...
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## This document was uploaded on 04/03/2008.

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Mos exam 1 03 - 1. Two possible conﬁgurations for the...

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