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Bossbutteringbe4-Participant
4-Participant
December 4, 2013
Solved

Material file database (again)

  • December 4, 2013
  • 2 replies
  • 9318 views

Hello all - I'm new to this group but a seasoned Pro/E designer and experienced Mechanica user based on Ireland.

I have a job on which requires me to finally get to grips with the new elastic-plastic analysis functionality of Simulate 2 and apply it to a forming operation on a small 300 series stainless steel tube. Would anybody on here be prepared to share a material definition file for one of these steels, set up with stress/strain data for LDA? I'm not trying to freeload and would be happy to work collaboratively and reciprocally with one or more knowledgeable users who may also also be working to develop confidence in this powerful new functionality.

Many thanks

Tony


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Best answer by ehaenen

Hi Anthony

Just as long as you understand that this is a typical engineering approach to AISI 304, that works well in Creo2.

There is a lot to be said on how to correctly make a material definition, but this one works nice with Creo (Creo likes smooth curves) and fits the 304 data for yield and ultimate (with true strain of course!)

Try it, let me know what you experience.

https://drive.google.com/file/d/0BxuTvot6TxcLelVEZTdVdkk1UkE/edit?usp=sharing

Erik

2 replies

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DenisJaunin15-Moonstone
15-Moonstone
December 4, 2013

Hi, Tony,

Here is a link on quaractéristiques of stainless steel.

I do not know if this is exactly what you want.

Cordially.

Denis

http://www.pxprecimet.ch/data/documents/fiches-techniques/FR/liste-complete-alliage.pdf

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    ehaenen1-VisitorAnswer
    1-Visitor
    December 4, 2013

    Hi Anthony

    Just as long as you understand that this is a typical engineering approach to AISI 304, that works well in Creo2.

    There is a lot to be said on how to correctly make a material definition, but this one works nice with Creo (Creo likes smooth curves) and fits the 304 data for yield and ultimate (with true strain of course!)

    Try it, let me know what you experience.

    https://drive.google.com/file/d/0BxuTvot6TxcLelVEZTdVdkk1UkE/edit?usp=sharing

    Erik

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    Bossbutteringbe4-ParticipantAuthor
    4-Participant
    December 11, 2013

    Eric here is an update about how I got on - and another question! (should I post this on a separate thread?).

    I resolved my installation issues and familiarised myself with the advances in Simulate since Mechanica WF4.

    I modelled my problem (the flaring of the end of a thin-walled SS304 tube) using bricks as far as possible, using an enforced displacement constraint, making the tubing workpiece short enough to avoid buckling modes, defining contacts with the mandrel by hand etc etc. and using 80 time-steps and single-pass adaptive converegence I got this:

    Video Link : 4537

    Not too bad I thought given the non-ideal nature of the way the mesh was generated using the available mapping tools. I should be able to define a composite measure for tracking engineering stress and strain as per Roland Jakel's "Basics of Elasto-Plasticity".

    What is stumping me however is how to get the Include "Unloading function" to operate with my geometry, or to find a workaround. As Unloading seems to work with a single load reversal step, and as my part will be 'clinging' to the mandrel, Solver gives me: "Excessive motion detected at contact regions. Cutting load step size" during the final unload step, hunts for a workably-small load step and fails to converge. As a result I can't directly see the final plastic-only deformation of the flaring process.

    Erik, if you or others have any thoughts how to workaround this (apart from manually subtracting elastic strain from measured engineering strain) I'd much appreciate it!

    Tony

    3
    346gnu13-Aquamarine
    13-Aquamarine
    December 11, 2013

    Tony,

    For simpler problems such as increasing the pressure inside a cylindrical vessel until the material yields, clicking the 'unloading in 1 step' button has given quite different and (my opinion) less trustworthy answers when compared to manually entering a number of time steps for unloading. The examples I have use a measured material stress-strain curve as an input.

    In the case where parts form over/onto etc other, I would avoid the unload-in-one-step button and enter small time steps to withdraw your component using the enforced displacement constraint.

    Also, would make for a more impressive animation showing the spring back as is withdrawn.

    ... I wonder how this will work with friction in Creo3.0?

    Regards

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