Answered: PROBLEM 5.5-13

Engineering

Mechanical Engineering

PROBLEM 5.5-13

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter4: Numerical Analysis Of Heat Conduction

Section: Chapter Questions

Problem 4.50P

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

A fiberglass pipe is lifted by a sling, as shown in the figure. The outer
diameter of the pipe is 6,0 in., its thickness is 0.25 in,, and its weight
density is 0,053 1b/in³ the length of the pipe is L = 36 ft and the distance
between lifting points is s = 11 ft.
a. Determine the maximum bending stress in the pipe due to its own
weight,
b. Find the spacing s between lift points which minimizes the
bending stress. What is the minimum bebding stress?
c. What spacing s leads to maximum bending stress? What is that
stress?

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