Young's modulus of MATS1 compared to MAT1
Altair EmployeeHi all,
I've got problems at understanding MATS1-issues i am facing at the moment. From my unterstanding, choosing TYPSTRN=0 allows you to 'insert' my whole stress-strain-curve into HM as a .csv-file and work with it. so far so good.
As far as I understood MATS1, (PLASTIC) HM is calculating the actual young's moduls out of each data pair, which is a big change at plastic., But HM also needs a young's modulus as a MAT1-entry. So this isn't a big deal at all regarding the availibility of datasheets. But in how far is the MAT1-young's modulus considerd after all at the simulation. e.g. the datasheet`s young's modulus of my material is about 6000MPa, but the young's modulus of the MATS1-table is about 1000MPa calculated with y1 and x1 marking the yield point which is a high slope). HM is produring a warning if the MAT1-young's modulus is not equal to the MATS1-young's modulus calculated from first data-pair. So how does this work?
The actual simulation results show, that the model is too stiff..so from my point of view its the problem of choosing the right young-s modulus. One problem could be that the young's modulus is 'read' between 0,5 and 0,25% for platics so it's not at the beginning of the graph. Right?
What would be the best approach in this case: import the original test-data and put the young's modulus of MAT1 equal to MATS1 or should I go with TYPSTRN=1 after all. I'm working with large displacement.
I hope I could make my thoughts clear for you. I appreciate all help from you!!
Best regards
Samuel
Answers
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Hi Samuel,
I think the E on MAT1 is used. I ran a simple model with different E values add the result is below:
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Anyways, to confirm this I will check with experts.
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