I've noticed while reviewing many plastic datasheets, that they will often list tensile strength at yield values that are higher than tensile strength at break values. How does this make sense? Yield should always come before fracture, no? (Except maybe for really brittle things where they'll...
Intuitively I don't think washer diameter should matter because as we've said friction only cares about normal force and COF.
But does that also apply to a radial situation like a washer where the friction is generating a moment to counteract rotation? And then the washer diameter would matter?
How many people like getting their actual question ignored and irrelevant recommendations provided instead?
Seemed fairly straightforward to me: does washer diameter impact the rotational friction?
I should probably clarify that this is a non-critical, lightly-loaded plastic joint in a consumer goods product, so while I appreciate the discussion for robust solutions, it's a bit overkill for this.
The "bolt" is really just a hand-tightened screw so its not a tremendous amount of force we're talking about here. The design is in production so it works more or less. I'm just curious about the impact of washer diameters.
Consider a clevis with a bolt going through it, with an elastomeric washer on both sides to prevent rotation.
In terms of maximizing the friction, I don't think the washer's diameter matters because friction doesn't care about surface area (assuming a constant pre-load from the bolt and that...
Does it make any sense for part design engineers (not part manufacturers/molders) to have moldflow software and run analysis? Do any other design engineers that outsource manufacturing to 3rd party vendors/suppliers use moldflow in their design work?
Personally I think moldflow should be...
