The Theory of Shrinkage And Forced Fits With Tabulated Data And Examples From P
The Theory of Shrinkage And Forced Fits With Tabulated Data And Examples From P
William Ledyard Cathcart
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234. Sub- A stituting in (38) 8 = 0. 0003 inch, which, owing to the lower tensile strength of cast iron, is about one-third of the shrinkage-allowance in Example 1, although the stress is two-thirds of the elastic limit. For a forced fit, good practice gives (see Table VI) a unit-allowance of 0. 0013 inch, or one-third greater than that of Example 1. The stresses which such an allowance would produce are, however, uncer- tain, as will be further discussed in the following chapter. Example 4. Wh...at is the radial pressure P x in the above examples? Pi For Examples 1 and 2, we find from Table I that - = 0. 341. Hence, T 2 P l = 25, 000 X 0. 341 = 8525 pounds per square inch. Pi For Example 3, we find from Table I that = 0. 351. In this case T 2 r a = 4000, hence, P x = 4000 X 0. 351 = 1404 pounds per square inch. Example 5. What is the resistance to slip per inch of length of hub in Example 3? In Equation (30), A = 10, L = l, and from Example 4 we have P t = 1404; / may be taken as 0. 2. Then Q = 8817 pounds, which is the total resistance of a ring of the hub, one inch in length.
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