Eccentric load on weld prying load at tip of weld

[JAG-E]

I have been asked to assess an existing piece of lifting equipment. I have analyzed many welds but this is a configuration I cannot find a method for. The load is eccentric. Plenty of examples for that as well as computer applications, but not with this weld to load orientation. It appears to me the leading tip of the weld will be highly stressed, limited stress distribution, and would tend to "unzip". The weld group CG approach suggests a rotation of the cantilever about the weld group CG. Here the CG is in the center of single weld on each side. I think the tip of the weld and some limited depth into the weld, moving right to left would take all the bending load. I thought applying stress=Mc/I at the beginning of the weld using I and C of the two weld cross sections. Any suggestions or key words to search on would help.

Thanks,
Joe

PS There is no indication in preview if the image uploaded. If there are two they will be the same. If none I will try again to add the image.

https://files.engineering.com/getfi...4ece-bea2-064642131335&file=Scan_20230804.jpg

 

[driftLimiter]

What is the shape of this weld. Mc/I is a good way to approach it because you wont be depending on weld plasticity.

 

[dik]

A sketch would be great...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dauwerda]

Here is the sketch that was added to the OP

 

[dvd]

FYI - regardless of calcs there is a requirement to proof-test custom lifting devices (assuming you are in US by use of imperial units)

https://www.osha.gov/laws-regs/standardinterpretations/2002-06-14

https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.251

 

[dik]

Something like the attached is easy to analyse... 5/16" wall thickness for the forklift pickup might be a tad thin...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dik]

You may be able to use a longer lifting tube if you incline the forks upwards... the load then produces less moment if the tines go to the back of the tube.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik