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  1. CB77

    Plastics: yield strength higher than breaking strength?

    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...
  2. CB77

    Does washer diameter impact friction in a bolted joint?

    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...
  3. CB77

    Plastic Part Designers using Moldflow Analysis?

    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...

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