An Improved Linear Model for Elasto-Plastic and Adhesive Contact

Sunny_21964
Sunny_21964 Altair Community Member
edited June 2023 in Community Q&A

Dear all

Enclosed is an Improved Linear Model for Elasto-Plastic and Adhesive Contact (LEPA model), which was done in 2019-2021 and presented in several conferences:

1. A short description of LEPA model (word file): let guys better and quickly understand the model, in which only the yield stress of material is additionally required, compared to Hertz-JKR model.  If the guys are doing the simulation of bulk powder with plastic deformation, this model would be prefered.

2. A PPT and Excel file: showing how to use the dll library in EDEM, and some DEM cases are also provided.

3. Source code and corrpesponding papers published on PT:  for futher improvement and self-adjustement by users. If the model is used your paper, please cite the corresponding paper.

 

If have any questions, do not hesitate to contact me through email: nanwg@outlook.com.

 

Best regards

Sunny

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Answers

  • Stefan Pantaleev_21979
    Stefan Pantaleev_21979
    Altair Employee
    edited June 2023

    Hi Sunny,

    Thank you for sharing this model. We have a community led repository for custom scripts and models called Altair Exchange: https://community.altair.com/community?id=altair_exchange. I think this would be a great place for you to share this model so that others can use it.

    It would also be interesting to understand  how the LEPA model compares to the built in EEPA model. Are you aware of any comparative study?

    Best regards,

    Stefan

     

  • jpmorr
    jpmorr Altair Community Member
    edited June 2023

    Hi,

    This looks remarkably similar to the model proposed by Pasha et al, in 2014 (Fig.3) - can you expand on what the changes or improvement over that model are? I've had a quick scan of the attached papers but haven't had a chance to go into the details yet.

    Regards,

    JP

  • Sunny_21964
    Sunny_21964 Altair Community Member
    edited June 2023

    Hi Stefan and JP

     

    For the comparison between this model, and Luding's model, Pasha's model, Thornton's model, there is a detailed description in the paper enclosed in the zip file, i.e. "Nan, W., Goh, W.P., Rahman, M.T., 2022. Elasto-plastic and adhesive contact: An improved linear model and its application. Powder Technology 407".

    A quick look is also avialble in the word file enclosed above, some examples are given below. Shortly, the model here is:  more mathematical and physical, much less input parameters. 

    Best regards

    Sunny

     

    Quick look:

    image

    "1) Compared to Pasha et al. [2014], thorough unified mathematical equations are formally presented here, making it easy for implementation in DEM software packages with low computational time, while no similar mathematical framework could be accessed in Pasha et al. [2014].  

    2) Compared to Luding [2008] where plastic deformation is assumed to be present from the beginning, both the initial elastic and plastic deformation could be considered here：in dynamic particulate systems, the external load applied on the particles at some regions is not large enough to cause yielding, and hence the contact is still elastic.

    3) The number of parameters required for experimental characterisation in the proposed contact model is minimised. For example, compared to Hertz model with JKR theory, only the yield stress is additionally required in some cases, which could be easily found in the handbook of materials. On the contrast, the models Pasha et al. [5] and Luding [9] involves a number of key parameters which is not accessible from single particle characterisation."

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