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  1. DrewEven

    Estimating Yield Strength of Work Hardened Metals

    That makes good sense. I think maybe the best way to calculate the surface hardness in the slot area is with a micro-hardness tester. As for the "surface pressure" generated from the line contact, what sort of relationship does a materials ability to resist surface pressure have with it's...
  2. DrewEven

    Estimating Yield Strength of Work Hardened Metals

    I'm running into an issue, such that I need to be able to predict the yield strength of a cold worked part. The part is a hollow tube, seam welded from 3/16" SAE 1020 flat stock, which has a punching op. after welding and plating. I'm running Hertzian equations to predict the compressionial...
  3. DrewEven

    Hardness vs. Elastic Modulus

    OK, thanks to everyone for the help on the clarification of hardness vs. elastic modulus. Now I'm running into another issue for my calculation which is trying to predict the yield strength of a cold worked part. The part is a hollow tube, extruded from 1020 steel, and then has two slots...
  4. DrewEven

    Hardness vs. Elastic Modulus

    Ok, so I think everyone has confirmed to me that E doesn't change with increasing heat treatment, and only negligibly with cold working. So I'm confused because I thought that hardness was essentially a measurement of a materials ability to resist deformation from a harder material, which...
  5. DrewEven

    Hardness vs. Elastic Modulus

    I thought that the modulus of any steel (non heat treated) was 30 million psi. Doesn't the hardness measurement test the toughness of the material, i.e. the area under the stress strain curve? So by heat treating I'm only increasing the yield strength of the metal, not it's elasticity? From...
  6. DrewEven

    Hardness vs. Elastic Modulus

    Hello, first post here... I'm trying to calculate the contact stress between a metal pin and a flat metal plate. The pin is a 1045 steel that is through heat treated to a hardness of 45HRC. In order to calculate the contact stress between the pin and the plate using Hertzian's contact...

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