Impact test - 100ft.lbs

[gareth71]

Hi, I've got a test standard which states the component must withstand an impact of 100 ft.lbs, I dread to ask this question but I just have to... is this test dropping a weight of 1lb from 100 ft? Therefore a 10lb weight from 10ft?

In metric measurements I've worked it as 13.7m kg

The reason for my question is that it seems like an incredibly difficult test and some competitors claim to have met it with their products. It says the test should be done with a steel weight with 2 inch spherical radius, a shame I can't do it with a foam weight with a 2 inch spherical radius.

Is my assumption of 1lb from 100ft correct, or is there the difference between mass and weight so I can divide the whole thing by gravity?

 

[KENAT]

The more I think about it, my mattock example may not be far off in the amount of energy involved. Where it would be off is that the blade or even worse pick side will concentrate the impact force.

Sledge hammer would be closer but that's harder to imagine as an accident!;-)

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[hydtools]

Another underground scenario may be during hydro-excavation and someone using a digging bar to knock soil and rocks loose. Oops, hit that box.

Ted

 

[Tmoose]

Is a closure just the door portion of an enclosure?

"A closure shall not exhibit any mechanical damage after being subjected to mechanical impact."

A complete lack of "ANY physical damage" in my mind demands no chipped paint, or scratches, or even small dents, and is way beyond closing and latching and sealing properly.

I'm probably just naive, but a direct nudge or tap from a gently pawing earth moving device seems like more than 100 lb ft of energy.

 

[gareth71]

A closure is a box, something that goes around stuff. Some people call it an enclosure, but a pedant would say an enclosure is what's enclosed in a closure, for example a letter is enclosed in an envelope. The envelope is the closure.

Anyway, back on track, it's a good point about any physical damage. I read that as it would still seal correctly but it's open to interpretation!

 

[rb1957]

there's a long way between "loss of function" (OP) and "no damage" (Tmoose). the adjective "mechanical" could mean damage that prevents the mechanism from functioning correctly, or it could mean a dent (in that the dent was mechanically introduced) ... "paint clips" might be excluded.

another day in paradise, or is paradise one day closer ?