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Simufact material database for Inconel 718 powder

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I have few questions about the Simufact material database for Inconel 718 powder, when looking into the flow curves all I could see is the data for the plastic region, I would like to know why the Simufact didn't consider the elastic region. Also in the mechanical properties what is the input for elastic modulus for this material because am not able to find it, did you consider infinite elastic modulus? if yes, could you please explain.
 
Kindly look in to the below plot I got from a simple compression test showing true stress and true strain for IN718 powder at 20C .
In718
Could you please explain why the Simufact database doesn't have any elastic region data.
  • 0
    Hello Christian,
     
    Greetings!
     
    Can we control strain rate in the forging with hammer presses?
     
     
    Thanks,
    Vignesh.
  • 0
    Hello Vignesh,
     
    no, you can not control the strain rate when forging with the hammer press. The strain rate is a local condition in the material during forming, typically changing fast in time and location. Only for very simple geometries a correlation between the velocity of the dies and the strain rate in the material can be stated.
     
    There are forming processes with a controlled die velocity with the control based on some - simplified - assumptions of the (average) strain rate in the material. But this is not the case with the hammer press.
     
    The hammer press is defined by the initial energy and the mass of of the moving parts and dies of the press. "initial" means at the time when the moving die touches the workpiece for the first time. Consider the settings in the blow control in the forming control, too.
     
    Based on energy and mass you can calculate the initial velocity: Energy = 0.5 * mass * velocity^2. If you want you can control the initial velocity of the die with this and thus a little bit the initial strain rate of the material.
     
    But during forging the velocity decreases as given by the decreasing energy because of the work needed for forming and losses.
     
    BTW:
    Please start new forum threads for new topics. Helps every one to find answers in the forum. Thank you!
     
    Best regards,
     
    Christian
     
     
  • 0
    Thank you for your response. sure will start a new thread.
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