Machinery's Handbook Guide by John Milton Amiss

Author:John Milton Amiss
Language: eng
Format: epub
Publisher: Industrial Press, Inc.

Finding Diameter of Bar to Resist Safely Under a Given Load.— Assume that a direct tension load, F, is applied to a bar such that the force acts along the longitudinal axis of the bar. From Handbook page 216, the following equation is given for calculating the nominal stress:

(b)

where A is the cross-sectional area of the bar. Equation (2) on Handbook page 212 related the nominal stress to the stress concentration factor, K, and working stress, sw:

sw = Kσ (c)

Combining Equation (a), (b), and (c) results in the following:

(d)

Example 2: A structural steel bar supports in tension a load of 40,000 pounds. The load is gradually applied and, then, after having reached its maximum value, is gradually removed. Find the diameter of round bar required.

According to the table on Handbook page 429, the yield strength of structural steel is 33,000 psi. Suppose that a factor of safety of 3 and a stress concentration factor of 1.1 are used. Then, inserting known values in Equation (d):

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