Simufact material database for Inconel 718 powder

C B over 1 year ago

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 .

Could you please explain why the Simufact database doesn't have any elastic region data.

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0 C B over 1 year ago

Flow cures do not include the elastic region. Flow curves describe the stress needed to transition from the elastic to the plastic deformation: Once the stress reaches the flow stress, the elastic deformation stops and the plastic deformation starts. That is the theory about the math we are using.

Thus, if you have experimental data, you need to remove the elastic part to get a flow curve out of it.

The mechanical properties in the Simufact Material database include the Youngs moduls = elastic modulus for the elastic behavior. Generally we consider elastic-plastic material behavior, but you can simplify and use rigid-plastic, too, thus an infinite elastic modulus. But typically you do not win much with this.

In the simulation result (of a compression test) you should get a force-deflection curve (from the THS plot) containing both, elastic and plastic deformation, like the experiment.

Regarding "powder" materials in our database, please consider: The category Powder doesn’tmean that the data are powder properties,but the properties of the bulk material that is the result of the additive PBF manufacturing. See the relevant section of the Simufact Additive Tutorial.

Sintering properties for MBJ are different again. This is not plasticity any more.
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0 C B over 1 year ago

Flow cures do not include the elastic region. Flow curves describe the stress needed to transition from the elastic to the plastic deformation: Once the stress reaches the flow stress, the elastic deformation stops and the plastic deformation starts. That is the theory about the math we are using.

Thus, if you have experimental data, you need to remove the elastic part to get a flow curve out of it.

The mechanical properties in the Simufact Material database include the Youngs moduls = elastic modulus for the elastic behavior. Generally we consider elastic-plastic material behavior, but you can simplify and use rigid-plastic, too, thus an infinite elastic modulus. But typically you do not win much with this.

In the simulation result (of a compression test) you should get a force-deflection curve (from the THS plot) containing both, elastic and plastic deformation, like the experiment.

Regarding "powder" materials in our database, please consider: The category Powder doesn’tmean that the data are powder properties,but the properties of the bulk material that is the result of the additive PBF manufacturing. See the relevant section of the Simufact Additive Tutorial.

Sintering properties for MBJ are different again. This is not plasticity any more.
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