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  1. rphill12

    RSS equal to 3 sigma

    A simple way to answer this... The sigma value of the RSS tolerance analysis depends on the sigma value of the manufacturing process used to produce the part. If the part is manufactured using a +/- 3-sigma process, then it will be a 3-sigma tolerance analysis result using RSS. Or, put...
  2. rphill12

    Will larger diameter rims increase tire breakaway

    My question is this: Say you have a 17 inch rim on your car and the standard tire (let's say total wheel diameter is 22 inches) that comes with it. If you now take a 20 inch rim with a tire that increases the overall wheel diameter (lets say total wheel diameter is now 25 inches) but doesn't...
  3. rphill12

    Poisson Ratio for polymers

    I'm trying to find the Poisson ratio for a number of polymers and composites but I'm having trouble doing so. Is there a reason that this information is so hard to come by? I know that most polymers have a range of 0.3 to 0.5, but specific values are needed for this application. The materials...
  4. rphill12

    Copper color transition temperature

    Thank you very much for taking the time to both write that up and to research additional information. The copper in question is a laminated layer on a printed circuit board so the environment is not controlled to any type of lab standards. Next time I will be specific, but the information you...
  5. rphill12

    Copper color transition temperature

    Does anyone know the temperature at which copper will begin to change colors (i.e. blue, violet, and even gray.. I think gray is when the oxide formation happens, but I'm not positive). I'm really interested in knowing when the gray forms since it seems like that would be the highest...

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