Basically have to core drill them and punch out as they are so tight. Original rivets were tremendously tight as anyone who has ever replaced one of them knows. I did realize the slop factor and thread causes the slip aspect to come into play but wanted a real world answer. Using the 170,000 PSI bolts on critical suspension parts but wanted to know about the crossmembers and such. I want to use to stainless for the look(see pic) and painted the frame all in pieces for even coverage. Just wanted to know if the bolts, of a bigger size, would be comparable strength wise. The frame was originally riveted together and was NOT planning on putting rivets back in.
What I'm working on is a ground up, cutom truck. Without more information about your joint and application it's impossible to answer your questions. A bolted joint can be designed to properly take shear but never across the threads. A properly set rivet completely fills the holes and is in good bearing contact with the sides of the holes of the joined parts. What I'm trying to say is bolted joint design is not as simple as it appears.Īnother factor is shear. However many bolted systems are tightened purposely until the fasteners are stressed into the yield state. For many systems you reach practical failure when parts reach yield stress. Note however that good design often isn't based on the ultimate strength of an element. Do the same with your guesstimate for the rivet material with it's tensile stress area. So for your 70 Ksi bolts the ultimate tensile strength is. For a 1/2-13UNC thread the tensile stress area is. diameter rivet the tensile stress area is. These rivets can be alloy and higher strength too.Īs for utimate tensile strength you need material properties to calculate the numbers. They cooled and contracted and thus achieved clamping force. The rivets were heated red hot before insertion and setting. To achieve high clamping loads with normal headed rivets requires setting them while hot such as you've probably seen in old films of erecting steel skyscrapers such as the Empire State Building or bridges such as the the Golden Gate Bridge. Their big advantage is they are stressed in tension before they are set with a swedged collar so they maintain a high clamping load without the possiblity of backing off like a threaded fastener. They were old hat 35 years ago when I was in design at Peterbilt. They've been used in Peterbilt bodies and frames for nearly forever.
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