TAGGED: bilinear
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April 20, 2022 at 6:57 pmjavat33489Subscriber
I would like to hear the opinion of experts. How accurate is the calculation in LS-Dyna if only isotrope properties and bilinear kinematic hardening are specified for the material? For example, if the task is to drive a steel tooth into a piece of steel.
It happens that there are no other material data for calculation and you have to make do with what you have.
April 21, 2022 at 1:55 pmRam GopisettiAnsys Employeein other words, you are supplying the elastic and plastic properties to the model which is good,
can you elobrate " It happens that there are no other material data for calculation and you have to make do with what you have."
Cheers, Ram
April 21, 2022 at 4:51 pmjavat33489SubscriberI wanted to say that for the calculation I only have the yield strength, tensile strength, Young's modulus, Poisson's ratio, melting temperature and that's it. And to solve the problem of inserting a tooth into a steel plate, I have to use bilinear kinematic hardening in ls dyna, it takes into account only the yield strength. I could solve the problem in a static formulation and use multilinear kinematic hardening there, but the calculation will take a very long time. In addition, for such a task, a very fine mesh of 0.1-0.3 mm is needed. Therefore, I solve the problem in Ls Dyna. My question is that I want to know from you professionals how accurate is the solution using bilinear kinematic hardening in setting such a problem as inserting a tooth into a steel plate and similar problems. You have a lot of experience in calculations, can you say? I made some tests: ls-dyna + bilinear kinematic hardening st structural + multilinear kinematic hardening with the same mesh and loads. ls-dyna showed a margin of safety of 1.01 st structural showed a margin of safety of 0.7 Now I want to figure out which is more accurate. I would like to solve such a problem in LS-Dyna, because there is a fast solver.
April 25, 2022 at 1:54 pmRam GopisettiAnsys Employee
"I wanted to say that for the calculation I only have the yield strength, tensile strength, Young's modulus, Poisson's ratio, melting temperature and that's it. And to solve the problem of inserting a tooth into a steel plate, I have to use bilinear kinematic hardening in ls dyna," ---- How is this possible , you might want to account for tangent modulus ?, so this is just elastic.
"I could solve the problem in a static formulation and use multilinear kinematic hardening there, but the calculation will take a very long time. In addition, for such a task, a very fine mesh of 0.1-0.3 mm is needed. Therefore, I solve the problem in Ls Dyna." ---- is ths simulation follows implicit or explicit, are you expecting any element deleation or erosion?
i would consider Johnson-cook or any rate dependecy material model for this simulation.
on general note, does steel can punture steel ?
Cheers, Ram
April 27, 2022 at 5:54 pmjavat33489SubscriberI'd like to use Johnson Cook too. But I'm trying to find the parameters for some approximate steel data. And I'm worried about the resulting odds.
Only an experienced person like you can help here.
Please look at my questions.
I made two tables for two materials, see what coefficients are obtained? this is real?
Where can I find out in what intervals these coefficients should correspond?
I don't know if they are true
I decided to do everything not according to the book, but according to this video:
please help me?
April 29, 2022 at 10:32 amRam GopisettiAnsys Employeei guess you need to calibrate via experiemnt , there is more publised information on steel JC parameters modelded fro lsdyna.
I would recommed you to first start with literature review then start you FEA.
Cheers, Ram
May 5, 2022 at 6:50 pmjavat33489SubscriberI tested the materials on a tensile testing machine. Now I'm trying to digitize them. Can you help me make a video?
May 10, 2022 at 6:12 pmjavat33489SubscriberHelp pleaseMay 12, 2022 at 1:39 pmjavat33489SubscriberMaybe someone has a ready-made excel spreadsheet for calculating Johnson-Cook? Or has anyone tried to find Johnson-Cook using the least squares method and finding a solution in Excel?
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