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  1. Mattest

    "Proof stress"

    metengr, I still think we are not talking about offset yield or proof stress. We are talking about upper yield strength. this is a point where the gradient of the stress strain curve is zero for a defined strain. See Figure 2 on the following link...
  2. Mattest

    "Proof stress"

    We are forgetting the original clue: "unfortunately they failed the yield strength requirements.(have no definite yield)" If defg expects a yield point and the material does not exhibit this then there is a problem with the material, and it will probably not be suitable for its purpose. He...
  3. Mattest

    Verify Calibration of instron load cell.

    seesaw, No problem you need to turn the load cell upside down and load the end stud with weights to simulate the compression mode. Ensure that the weight is centred on the load cell stud (some load cells are sensitive to off-centre loading.) Max 10kg will be enough (100N / 9.81). I would...
  4. Mattest

    Verify Calibration of instron load cell.

    2 questions: 1) Is your query regarding tensile or compression? 2) What is the capacity of the load cell? You will need to check it in the same direction and depending on the capacity you may be able to check with weights. It may be that the cell has been overloaded and then you can get...
  5. Mattest

    "Proof stress"

    Metengr - I think you are confusing Proof stress and Yield stress. These are two different properties of metal as defined by EN10002. There is also Upper Yield point (ReH) and Lower yield point (ReL). Everyone should be talking about the same property. defg : If the material exhibits no...

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