Mech302MechMaterials_Exam2 - WENTWORTH INSTITUTE OF...

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Unformatted text preview: WENTWORTH INSTITUTE OF TECHNOLOG y Electromechanical Engineering Program MECH302 (Mechanics of Materials) Exam I Fall 2011 (9/29/2011) 7 .1! " 1. Six nails are used to hold the hanger at A against the column. Determine the minimum required diameter of each nail. The nails are made of a material for which Ty: 15 ksi. Apply a factor of safety of 1.5 (30%) [MEGS FSESF: lgvlfffii m” “M“ ”W: “Lu ”’5‘“ *oo‘ibmquu: 1%” ‘ M 17/1 (1011:? 2. The shear stress-strain diagram for steel alloy is shown. If a bolt having a diameter Tim} of 0.25 in is made of this material and used in , the lap joint, determine the modulus of W m 30 elasticity E and the force P required to cause the material to yield. Take Poisson’s ratio v = 0.3 (35%) 0904 I Wad) (F'- E 3.9 ; $25€J5=§ Qzfl ‘ WW KIN) r T: (7’ ‘6 zgoo "e t :2 (we) \ 5 [28007437, ”" I‘léwizb): E 5:52 5m m g \l <_’_ '1 I ' (it C? r r—‘\ :d. ‘7‘.“- L m m x", M f l M f!” 0‘1 e. I M I“: U“ Q 3. The A~36 steel wire AB has a cross sectional area of 10 mmz. Determine load P which causes the wire to stretch 0.8 mm. Use E = 200 GPa. (35%) Jéignffhn V’s EC: U2 (QObefa)( can?) : QSOMl/ Mun“? two , W W ZMMfl— if ‘ (IMJO’ZM‘) ...
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