Hyperelastic Material Correlation
Hyperelastic Material Correlation
(OP)
Hi everyone!
I'm going to perform a structural analysis of na offshore componente called bend stiffener. It is made of polyurethane and it undergoes large elastic deformation. In this case, I need to use a hyperelastic model. I have the simple tensile test data for the polyurethane.
In order to decide which Abaqus hyperelastic model I should use in the bend stiffener analysis, I tried to correlate each model with the tensile test data I have. I modeled the specimen by using its exactly dimensions, then, I fixed one end of the specimen and I applied the total displacement reported in the tensile test data, i.e., 74 mm, on the other end. Then, I used the card *NODE PRINT to saved the reaction force of that point on the .dat file. The displacement I applied was the displacement of the tensile tests machine moving head when the specimen broke. For the analysis, I used the following cards:
*HYPERELASTIC, TEST DATA INPUT, POISSON = 0.45, YEOH
*UNIAXIAL TEST DATA, SMOOTH = 3
0.0000, 0.000
4.3917, 0.020
7.1791, 0.048
9.2796, 0.072
10.6931, 0.096
11.6854, 0.120
12.4112, 0.148
12.9463, 0.168
.
.
.
49.1106, 2.924
49.4159, 2.936
49.7593, 2.948
50.0654, 2.960
**
*STEP, INC = 100, NLGEOM = YES
**
*STATIC
0.005, 1.0, 1E-15,
**
*BOUNDARY, OP = NEW, TYPE = DISPLACEMENT
CONST_NODE, ENCASTRE
FORCE_NODE, 1, 1, -74.0
**
I started by using Yeoh model, then I ran the same model for the other models (Mooney-Rivlin, Arruda-Boyce, Polynomial, etc.). Following, for each model, I plotted the force vc displacement diagram along with the experimental data and I have not found any correlation among the hyperelastic models and the experimental data by simulating the tensile test itself.
Is there any additional information I should input? Is it a good practice the model the specimen with its whole dimensions? Do you guys think this could the problem?
Thank you in advance.
I'm going to perform a structural analysis of na offshore componente called bend stiffener. It is made of polyurethane and it undergoes large elastic deformation. In this case, I need to use a hyperelastic model. I have the simple tensile test data for the polyurethane.
In order to decide which Abaqus hyperelastic model I should use in the bend stiffener analysis, I tried to correlate each model with the tensile test data I have. I modeled the specimen by using its exactly dimensions, then, I fixed one end of the specimen and I applied the total displacement reported in the tensile test data, i.e., 74 mm, on the other end. Then, I used the card *NODE PRINT to saved the reaction force of that point on the .dat file. The displacement I applied was the displacement of the tensile tests machine moving head when the specimen broke. For the analysis, I used the following cards:
*HYPERELASTIC, TEST DATA INPUT, POISSON = 0.45, YEOH
*UNIAXIAL TEST DATA, SMOOTH = 3
0.0000, 0.000
4.3917, 0.020
7.1791, 0.048
9.2796, 0.072
10.6931, 0.096
11.6854, 0.120
12.4112, 0.148
12.9463, 0.168
.
.
.
49.1106, 2.924
49.4159, 2.936
49.7593, 2.948
50.0654, 2.960
**
*STEP, INC = 100, NLGEOM = YES
**
*STATIC
0.005, 1.0, 1E-15,
**
*BOUNDARY, OP = NEW, TYPE = DISPLACEMENT
CONST_NODE, ENCASTRE
FORCE_NODE, 1, 1, -74.0
**
I started by using Yeoh model, then I ran the same model for the other models (Mooney-Rivlin, Arruda-Boyce, Polynomial, etc.). Following, for each model, I plotted the force vc displacement diagram along with the experimental data and I have not found any correlation among the hyperelastic models and the experimental data by simulating the tensile test itself.
Is there any additional information I should input? Is it a good practice the model the specimen with its whole dimensions? Do you guys think this could the problem?
Thank you in advance.





RE: Hyperelastic Material Correlation
http://www.3ds.com/company/events/scc-2013/custome...
"Reverse-engineering of Contact Lens Mechanical Properties from an In Situ Compression Test"
I hope this helps.
Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/
RE: Hyperelastic Material Correlation
I am not used to working with Abaqus/CAE for modeling purpose. I use to create the mesh and generate the .inp file by using Hypermesh, then I type the necessary Abaqus cards in the .inp file. I just use Abaqus/CAE for visualization of the results.
But, anyway... You mean that I should simulate this job by considering only one elemento, is that right?
Once again, thank you very much!
RE: Hyperelastic Material Correlation
Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/
RE: Hyperelastic Material Correlation
I got the results I expected. I just modeled the gauge section of the specimen, intead of modeling the whole specimen. Now, the results look much better and reliable.