PSU living hinge

[POOLS]

Hej

Is there anyone which can help me designing a living hinge of PSU.

The thickness is 0.2 mm
length is 6.7 mm
width is 19

the questions i have is:

the life cycle for bending in 45 deg. is 500 times?
is this design possible for injection molding?

 

[patprimmer]

It's certainly possible with PP with the right grade if designed correctly in a correctly designed mould and if moulded correctly. Note there are a few ifs in there. I am presuming PSU is polysulphone. I was not aware its molecule was linear enough to draw down to bring the molecules parallel enough to be all perpendicular enough to the axis of the hinge.

Regards
Pat
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[POOLS]

PSU is Polysulfone and is used in medical equipment. I am making a bachelor project for a medical device where i need to make this living hinge. this material is unchangeable. i just need some guidelines to confirm if this material is application for making a hinge.

 

[patprimmer]

So you are a student? Did you read sight policy on student posts?

Regards
Pat
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[btrueblood]

I don't think polysulfone would make a very good living hinge. It has a high modulus, and coupled with very low elongation properties, likely to snap on the first cycle.

this suggests not:

http://www.steinwall.com/PDF/AA-PSU.pdf

 

[ornerynorsk]

WHY is the material unchangeable? PP is the traditional living hinge material, as others have mentioned.

If the material spec truly is written in stone, can you design it as a 2 pc "snap" hinge instead?

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.