I have tried the following and it doesn't work
- overlaying the two material properties and assigning the corresponding section properties to rope with different modulus in compression(1MPa)(very low modulus) and tension.
- Selecting C3D8H elements for adding the property of constant volume to avoid excessive distortion under compression
- Selecting Reduced Integration and Without Reduce Intergration Element to avoid excessive distortion under compression
Does anyone have a reference UMAT written in ABAQUS?
Try the "birth/death" feature (terminology as per ANSYS, take corresponding feature of ABAQUS)
Rahul Leslie
Dear Barun Mazumdar,
Maby try to use anisotropic constitutive material model?
Best Regards,
Bartosz Grzeszykowski
As Bartosz toled, a strong anisotropy gives a property of a rope. You can give almost zero modulus for the transverse directions. Due to the low shear modulus, the bending stiffness becomes very low. It is identical with a rope.
Exactly. Also be very careful, a rope may have large displacements, so small strain theory may not describe properly the phenomenon You want to model,
Best Regards,
Bartosz Grzeszykowski
One more thing. A rope is soft in compression. This is not due to a low modulus in compression, but due to the extremely low buckling load. The low buckling load is because of the very low bending stiffness.
Hello Barun Mazumdar ,
It is a good time to simulate a rope to take into account the type of braid between different bundles of wires and aces there are other materials in the core to determine the different properties of the materials. It will be good if the bundles are malleable as are the real ones on the rope.
Wishing for success in the study.
Emil Yankov
Thanks to everyone for replying on my question. But I have the following problem:
- @Fukada @Grzeszykowski To induce anistropy, how do input values in the Anitropic box of elastic type material property to give a first check whether everything is running fine?
- @Grzeszykowski: If we cannot use small strain theory, then shouldn't we use Hyperelastic model instead of Elastic?
- @Yankov : We cannot model the rope made of braids as per the problem specification.
I used slipring to solve the issue. It is used to model seat belts in one of the example of Abaqus documentation. https://abaqus-docs.mit.edu/2017/English/SIMACAEEXARefMap/simaexa-c-seatbelt.htm
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