Posted by Matt Wilson on Wednesday, April 04, 2001 at 1:03AM :
In Reply to: Re: Wondering Also posted by Kevin in Ohio on Tuesday, April 03, 2001 at 12:15PM :
It's interesting to read about your experiences with truck frames/suspensions. You guys must have really been overloading those rigs!
Looking in some of my engineering machine design text books, the information I found indicates that Grade 2 bolts have an ultimate shear strength of around 40,000 psi, while typical rivets appear to have an ultimate shear strength in the range of about 40,000 - 65,000 psi. This seems to indicate that there may not be a whole lot of difference between the two, if you were to assume that the lower number (40,000 psi) is the strength of the rivet material used in truck frames.
The rivet material shear strength was provided directly in the texts, with no indication of tensile strength. However, for the bolts, only the ultimate tensile strength was provided, so I had to estimate the bolt material shear strength from the ultimate tensile strength provided. A better comparison and a more complete listing can probably be found in fastener handbooks and supplier books.
This is the information I found, but I can't say that this is complete, by any means.
As a side note, for an increase from the 3/8" diameter to the 7/16" diameter that you mentioned, the increase in cross-sectional area is 36%, if you look at the region away from any threads.
What does anyone else know?
Matt
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