Plasticity - FEA using ANSYS - Lesson 8
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- Опубликовано: 10 фев 2025
- This tutorial adds material plasticity into nonlinear analysis, illustrating this behavior in a steel coupon tested in tension.
Learning objectives:
1. Define bilinear and multilinear plasticity properties.
2. Apply symmetry constraints to reduce the size of the model.
3. Describe the phenomenon of necking and why it occurs for plastic materials.
Excellent video. Brief, clear and well explained. Thank you for sharing it
Thank you!
Awesome video! quite comprehensive. Keep it up Prof. H!
Hi Professor
thank you for your useful video
can you please give the PeeK (polyetheretherketone) material properties? I need it
thanks
Excellent explanation. Can you please brief about determination of elastic properties of a structure in the direction of the applied load or displacements?
hello prof, if we dont have stress and strain for the plasticity from the test, what should we do? i mean if i want to do the plastic simulation for a new model without having the information about the stress and strain of it.
There is no substitute for actual material testing. That being said, if you are using some well-studied “typical” materials there is probably some literature out there to start you in the right direction. When in doubt, start simple and then add complexity. Try the model just assuming elasticity - you just need a modulus and Poisson’s ratio - and see how it behaves. Then add some yielding (isotopic bilinear hardening is probably the simplest - you need a yield stress or strain and a new modulus after yielding) and see how it behaves. You may find that these alone will give you some useful insight, or you may find that adding still more complexity is required.
sir please the main problem is how to get these strain data points from the stress strain curve for defining the multilinear isotropic hardening?
As long as you have stress-strain data for your material (from the lab or perhaps from the manufacturer), then you can input it here. The multilinear table requires us to define the stress and the plastic strain, where plastic strain = total strain - (modulus*stress). The modulus is whatever you have specified as Young's Modulus, which should also be given for your material either from lab data, or from typical tables of material moduli.
Hi sir . Could you please making a comparison between two bodies with same dimensions and same materials but with a different effecting force , and please make the comparison with actual deformation Contour
Hi Prof. Thankyou for the amazing video.
I have a doubt. When stress exceeds the yield point then why does it remain at that point? Why it does not increase?
The slope of tangent modulus is less in bilinear than young's modulus. So, stress should increase more rapidly right?
Hi Sushant,
I’m glad you found the video useful! As for the yield point, post yield the strain will increase rapidly (plastic strain) not the stress. The slope of the bilinear model describes the stress/strain, so a lower slope means less stress and more strain. In fact, a “perfectly plastic” material will have no increase in stress once the material yields.
Magnifique