Material Properties for Vibratory Load

[Mechomatic]

I am researching alternate injection molding resins due to material supply availability (i.e. we're about to run out of our qualified material and can't get more). Use case is for threaded fittings.

Specifically, I'm wondering what material properties are most important when considering the potential for vibratory load (typically between 20-100Hz). Some co-workers have said that high Impact properties (Charpy/Izod) are needed to withstand the vibration, though I'm having a hard time wrapping my head around that.

So what should I be looking for in a material under combination vibratory and static loading, e.g. high tensile strength, high impact strength, high tensile elongation at yield?
What properties should I look to avoid, e.g. low tensile elongation at break, extremely high tensile modulus value, etc?

 

[Pud]

What was the unobtanium you can't get?


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

 

[Mechomatic]

Pud-

Dupont Delrin 100ST. Word through the grapevine is they are unable to source/produce one of the critical additives/modifiers, and several other resin manufacturers/compounders are similarly unable to provide their catalog equivalent material.

 

[Pud]

You could have a look on here for a similar grade:

https://www.ulprospector.com/plastics/en/datasheet/36988/delrin-100st-nc010

Have to sign up for free 3 month trial.

Why this choice? Chemical resistance or because it's a toughened grade?

We used to use a gf pu which was extremely tough and also chemically very resistant. Can't recall name at moment though.

I guess that everyone who uses it is scratching around as well...


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

 

[Pud]

Remembered!

https://www.lubrizol.com/Engineered-Polymers/Products/Estaloc-RETPU

Tough as old boots.


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