cantilever load test
cantilever load test
(OP)
Hi Guys,
I have a aluminum cantilever arm that I want to load test for 400 lbs weight. Wanted to hang this weight on the end of the arm to see if this can take the load.
Since I have difficulty with finding the needed weights. Can I instead use a cylinder that can push the end of the arm upwards for 400 lb-force.
Are these to same?
Thanks
GC
I have a aluminum cantilever arm that I want to load test for 400 lbs weight. Wanted to hang this weight on the end of the arm to see if this can take the load.
Since I have difficulty with finding the needed weights. Can I instead use a cylinder that can push the end of the arm upwards for 400 lb-force.
Are these to same?
Thanks
GC
Thanks,
GC





RE: cantilever load test
However, when you say "load test", that phrase can have a very specific meaning including the use of a certified shop with certified calibrated weights, approved setups, specified overload factors, official labels, detailed procedures governed by codes in some jurisdictions, etc. Saying a design is "strong enough" is one thing, and it means different things to different people, but saying it is certified for a certain load is another matter altogether.
RE: cantilever load test
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P.E. Metallurgy, Plymouth Tube
RE: cantilever load test
RE: cantilever load test
Make sure to recognize this in any stress analysis that follows such a test.
Compression is NOT equal to tension, except for light loads that don't get out of the perfectly elastic stress range. Beam failures usually start on the compression side, in particular by local crushing or buckling of parts of the cross-section shape. If you reverse the load direction then the stresses reverse - which is valid only if the beam is symmetrical. Also make sure to identify the direction of the real load as the beam deforms. It may remain aligned with the tip, or it may remain in the same direction. When large deflections are at play, the angle of your test rig can grow to unrealistic directions, depending on where you apply the load, and what the real load condition looks like.
If you set this up yourself, think through the safety aspects of conducting the test - for you and all other people involved.
STF
RE: cantilever load test
je suis charlie
RE: cantilever load test
Yes, I am doing this to meet a code's requirement. Load test 4 times the final product's weight for 1 hr and see if the lever arm sustain visible distortion and damages.
Unfortunately, can't keep the cylinder pushing 400 lb-force constantly for an hour. compressed air leaking issues. the load gradually reduces. I may have to go weights.
Thanks for all the input guys.
Thanks,
GC
RE: cantilever load test
Even one of the old fashioned mechanical cells with a "U" frame and a dial indicator would work.
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P.E. Metallurgy, Plymouth Tube
RE: cantilever load test
another day in paradise, or is paradise one day closer ?
RE: cantilever load test
another day in paradise, or is paradise one day closer ?
RE: cantilever load test