hyperelastic material data in abaqus
hyperelastic material data in abaqus
(OP)
Hello there,
Currently I am trying to simulate a hyperelastic material. I have uniaxial test data from experiment. When I implement this data to Abaqus/CAE 6.7-1, and run the simulation, I have a problem since the stress and strain do not increase continously. Simulation is aborted. Could you please help me to solve this problem? Is there any way to solve this problem?
Regards,
Berkan
Currently I am trying to simulate a hyperelastic material. I have uniaxial test data from experiment. When I implement this data to Abaqus/CAE 6.7-1, and run the simulation, I have a problem since the stress and strain do not increase continously. Simulation is aborted. Could you please help me to solve this problem? Is there any way to solve this problem?
Regards,
Berkan





RE: hyperelastic material data in abaqus
Rob Stupplebeen
RE: hyperelastic material data in abaqus
Thank you very much for your reply.
Nonlinear Geometry is: On
The problem is with the uniaxial test data.
Please find the attached file.
RE: hyperelastic material data in abaqus
Forever Young.....
RE: hyperelastic material data in abaqus
I suggest using Materials-Evaluate in the property manager to select an appropriate material model.
Why have you set the step time to 1000 from 1? This is an arbitrary number and everyone else that I have worked with just reduces the step size if convergence is slow.
I hope this helps.
ERRORS:
The nominal strains under the *uniaxial test data option must be arranged in ascending order
1 elements have been defined with zero hour glass stiffness. You may use *hourglass stiffness or change the element type. The elements have been identified in element set ErrElemZeroHourGlassStiffness.
Analysis Input File Processor exited with an error.
Rob Stupplebeen
RE: hyperelastic material data in abaqus
Stupplebeen: Yes, that is the problem. Data is not appropriate since it has a decrease in stress. It is not increasing continously and I do not want to change the data. Is there a way to run this simulation?
about time step: after analysis, I would like to have stress-strain data. thats why I had this.
RE: hyperelastic material data in abaqus
Rob Stupplebeen
RE: hyperelastic material data in abaqus
Regarding the strain energy potentials, I can only choose Marlow since I have only one test data. Abaqus documentation does not suggest to use other potentials if I do not have different test data(like biaxial, uniaxial, volumetric etc.)
I have changed the data a little bit, arranged the strains and stresses in an ascending order (without changing the general behavior of the curve). It does not run now. Obviously, there is no problem with nominal strains right now but it does not tell what the problem is :(
RE: hyperelastic material data in abaqus
Also I changed the time step, made it only 1 seconds, and every 0.05 seconds I receive data.
Thank you very much.