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Plastic Creep Question
2

Plastic Creep Question

Plastic Creep Question

(OP)
Hello, I'm designing an ABS plastic part that's going to experience a constant load (see image link below). I'm concerned that the surface under load will creep over time. If this surface deflects too much or breaks, then this could cause failure of the product. I can't seem to find creep properties for ABS. Does anyone know if this approach is flawed, or a way to estimate the long duration deflection and stress without doing a DMA? I would really appreciate any help here. Thanks!

https://res.cloudinary.com/engineering-com/image/u...]

RE: Plastic Creep Question

The problem with ABS is there is no such thing as a 'standard' grade.
You might be lucky to get a supplier of material who can give you isochronous sress/strain data but I've never seen one in 25 years.
Your product will creep. How much is anyone's guess.
Suggest you investigate alternative materials.

Cheers


Politicians like to panic, they need activity. It is their substitute for achievement.

RE: Plastic Creep Question

There are lots of co-polymers with ABS also.
If you keep stresses low then there is little risk, but numbers are hard to come by.
It has been used for a lot of things from Lego to telephones for decades so there must be some guidelines out there.
The big weaknesses with ABS are weathering and petroleum exposure.

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