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Shaft sizing question

Tags: shaft, sizing
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Oct16-08, 08:20 PM
P: 2
Attempting to use the formula:
D = 1.72 (Tmax/σmax)^1/3

In my case I do not know σmax or at least how to calculate it from material properties.
Material is 1045
UTS 84800
YTS 74300
Tmax = 591.55 in-lbs

D = 1.72 (Tmax/σmax)^1/3

Any help would be appreciated.

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Oct17-08, 07:01 AM
Sci Advisor
FredGarvin's Avatar
P: 5,095
As a very rough pass, you can use your yield strength as [tex]\sigma_{max}[/tex]. Your equation is essentially assuming a set relationship for ductile materials and the relationship between shear stresses and normal stresses. This is for static, pure shear only.

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