Hi everyone,
I am trying to incorporate the Shear modulus reduction curve. This is basically a curve that shows the relationship of the modulus with changing strain (modulus of soil decreases as strain increases).
First of all, is there a way to incorporate this without defining a umat? And if the only way is umat, where can I learn how to write a umat code?
I know there is a way to change the properties of elements for different temperatures, so I was thinking of checking there is a way to automatically make elements get hotter(increase temperature) as their strain increases? And then for each value of strain they will have different properties?
I am simulating soil-pile interaction of a pile embedded in soil (dry sand with 100% relative density) under dynamic loading (earthquake). During the time-history of the earthquake certain elements face high strain therefore, their properties (shear modulus) should decreased based on their strain.
Thanks in advance.
Hi Gang,
You are saying get the maximum for each element? Isnt this impossible to do when you have 80,000 elements? You mean get the maximum strain for all element and then change G for all the soil and repeat?
Reduction of the apparent moduli is incorporated in Abaqus with the critical state plasticity models (Drucker-Prager with cap and the Modified cam-Clay). Reduction of the apparent moduli can be observed during combined kinematic loading (see our paper DOI 10.1007/s00419-016-1169-x).
As you also work with soils, both mentioned above models should satisfy you.
Hi Sergey,
Where does it say in the abaqus documentation that these models take into account the reduction in apparent moduli?
Also I couldnt find the modified cam-Clay model in abaqus, do I have to implement it manually?
Mousafa
Mousafa,
I think any critical state models at the supercritical (wet) zone lead to softening
In Abaqus Modified Cam-Clay is called "Clay plasticity"
Do not forget to specify elastic properties, and then yield surface
Here is an example
- Badges
- Science topic
- Similar topics
- Computer Science and Engineering
- Computer Graphics and Animation
- 3D