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ME 211 Homework 5 Solutions

# ME 211 Homework 5 Solutions - Problem#18.16...

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ME 211 Homework Set #5 Solutions 10‐10‐2008 Problem #1 – 8.16 Two designs for a shock support are shown in the figure. The spring has a stiffness of k=15kN/m and in (a) it is uncompressed, whereas in (b) it is originally stretched 0.2m. Determine the average normal stress in the 5‐mm‐diameter bolt shank at A when the 6‐kN load is applied. In (b) the bracket B is not connected to the support. 1.) For Case (a), write your equilibrium equation to solve for P, and determine the stress in the spring. F y = 0 = P 6 P = 6 kN σ = P A = 6 kN π 4 (0.005) 2 = 306 MPa 2.) For Case(b), the load will cause the spring to stretch. The load is entirely supported by the spring. F = kx 6 kN = (15 kN / m ) x x = 0.4 m P = 6 kN σ = P A = 6 kN π 4 (0.005) 2 = 306 MPa

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Problem #2 – 8.80 The built‐up shaft consists of a pipe AB and solid rod BC. The pipe has an inner diameter of 20mm and outer diameter of 28mm. The rod has a diameter of 12mm. Determine the normal stress at points D and E and represent the stress on a volume element located at each of these points.
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• Fall '07
• ?
• Stress, Fed, Thebarsofthetrusseachhaveacrosssectionalareaof1.25in*in.Ifthemaximum averagenormalstressinanybarisnottoexceed20ks,determinethemaximum magnitudePoftheloadsthatcanbeappliedtothetruss, ForCase

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ME 211 Homework 5 Solutions - Problem#18.16...

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