Canpro - naturally aesthetics doesn't trump safety, it's just one more thing I need to consider in the design in this case. I'm quite concerned with safety here, which is exactly why I've put the question to this forum. It's often frustrating in this industry to have to constantly balance...
Thanks for the responses, everyone.
Just for some additional context, the fall-arrest ring in question will be used for maintenance at the top of a mast/flagpole on a large luxury yacht, so aesthetics trumps quite a lot in this case.
You are all correct that the fall arrest load I am using is...
I am looking for some guidance on an apparent discrepancy between my own calculated strength values for a u-shaped clip-in ring (similar to a shackle), and the rated strengths of commercially available shackles. Can anyone provide a reference for some equations to use in shackle design? All of...
Thank you, desertfox, that reference had what I was looking for: "The [proof] load is equal to the proof stress multiplied by the tensile area of the same size external thread". So the proof stress is not the shear stress in the nut threads under the applied proof load, but rather the tensile...
I understand that proof and yield are not the same - I'm primarily confused as to the discrepancy between the listed "proof stress" and the applied "proof load" in the A194 spec. If I use the listed "proof stress" to back-calculate the "proof load" based on the shear area of the nut threads, I...
Thanks again for all your responses. CoryPad and BCD, I wanted to verify your answers for myself, so I tried to dig up copies of the ASTM A962 and ASTM A194 specs.
I was finally able to find a copy of ASTM A194, and the spec lists a proof load for a 1" Gr 8 heavy hex nut of only 48,480 lb...
Oh, and one other assumption I'd like to have clarified: is the proof load stress specified for a nut a shear stress value, or a tensile stress value? I would assume that this is a shear stress value in the threads.
I only ask because typically if a material yield stress (σy) is specified...
Desertfox, the roymech site is the one I used and was trying to link: http://www.roymech.co.uk/Useful_Tables/Screws/Thread_Calcs.html.
Not sure why the link didn't show up.
Thanks for the responses, guys!
I see the point about comparing the total part strength rather than just the material strengths. I think some of my confusion came about due to the wording in several of the references I found which seemed to imply that a simple comparison of the proof load...
I'm designing a structure which requires high-strength stainless steel bolts. I have spec'd out 1" diameter ASTM A193 B8 Class 2 bolts, with a yield stress of 80 ksi and an ultimate stress of 115 ksi.
I'm now trying to spec out nuts to go with these bolts, and the information I'm getting from...
Thanks for the response, and thanks for catching the goof in the last paragraph. My references indicate that the load factor should, in general, be greater than 1.0 to keep stress below proof strength.
With that said, why then do some specs suggest tightening the bolts to 90% of yield or...
I have a question regarding bolt preload and the resulting bolt "load factor".
I am designing a bolted connection for a cargo crane foundation on a large marine vessel. We are limited to a 1" bolt diameter by the crane vendor's bolting flange design, and we would prefer to use stainless steel...
