Can we define material property in Tabled Type of Fatigue?

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

I know we can set material property of fatigue in MATFAT.

 

And we can set the SN curve points of the material.

 

I am curious about can we use the TABLE's type to import our material data in fatigue material?

 

Because at the thermal we can do for this.

 

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And I also have problem about the FATPARM's instruction of COMBINE

 

what is 'SG' mean?  Because I have seen it shown like the photo and it also written in SGVON (SG von-Mises)

 

image.png.425b1c918353cb968cce88ad8d9283ad.png

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018
    Altair Forum User said:

    I know we can set material property of fatigue in MATFAT.

     

    And we can set the SN curve points of the material.

     

    I am curious about can we use the TABLE's type to import our material data in fatigue material?

    hi,

     

    Do you mean non-linear material?

     

    Von Mises alone is strictly positive. So, if you are referring Vonmises for fatigue analysis only positive history is taken into account. Whereas signed-von Mises can take both negative and positive. Same with Tresca

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    @Prakash Pagadala Thanks to your reply.

     

    Here I mean the define SN in MATFAT can we set the SR1 or B1 in TABLE's type?

     

    And here I know the SG is means we have both positive and negative.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Hi,

     

    You can define a SN curve using TABLEXN in which X will be stress and Y will Life. 

  • Nathan_22110
    Nathan_22110 Altair Community Member
    edited April 2020
    Altair Forum User said:

    Hi,

     

    You can define a SN curve using TABLEXN in which X will be stress and Y will Life. 

     

    Altair Forum User said:

    @Prakash Pagadala Thanks to your reply.

     

    Here I mean the define SN in MATFAT can we set the SR1 or B1 in TABLE's type?

     

    And here I know the SG is means we have both positive and negative.

     

    Hi,

     

    I had the same problem a few minutes ago. In OptiStruct help it was well explained that you can use TABLEXN to define manually one S-N curve, and that you can also use SNCM continuation line with FATMCRV card to define multi-mean SN curve. I found these options in HyperMesh 2019.1 but not in 2017.3.

     

    So, I wonder if there is a way to define one SN curve with that version other than using SRI1/b1 coefficients, in other words if there is a way to define an SN curve manually. Because I am able to create a FATMCRV Load collector, but there isn't any SNCM continuation line to reference FATMCRv or TABLEXN data.

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