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    SimScale DocumentationValidation CasesValidation Case: Hyperelastic Planar Tension Test

    Validation Case: Hyperelastic Planar Tension Test

    This validation case belongs to solid mechanics. The aim of this test case is to validate the following parameters:

    • Hyperelasticity under planar tension

    The simulation results of SimScale were compared to the results derived from [Treloar]\(^1\).

    View Project

    Geometry

    The geometry used for the case is below:

    cube geometrical model
    Figure 1: Geometry model for the cube

    The cube has an edge length of 1 \(m\).

    Analysis Type and Mesh

    Tool Type: Code_Aster

    Analysis Type: Static Non-Linear

    Mesh and Element Types:

    The mesh for the cube geometry was computed using SimScale’s Standard meshing algorithm.

    CaseMesh TypeNumber of
    Nodes    		Element Type
    AllStandard11841st order tetrahedral
    Table 1: Finite element model for each case
    tetrahedral mesh for planar tension validation case simscale
    Figure 2: Tetrahedral element mesh for the cube

    Simulation Setup

    Material:

    Hyperelastic material, with the following parameters for each type of law:

    • Neo Hooke:
      • \(C_{10} = \) 1.684 \(Pa\)
      • \(D_{1} = \) 1e-6 \(1/Pa\)
    • Mooney-Rivlin:
      • \(C_{10} = \) -99.16 \(Pa\)
      • \(C_{01} = \) 100.8 \(Pa\)
      • \(D_{1} = \) 1e-6 \(1/Pa\)
    • Signorini:
      • \(C_{10} = \) 1 \(Pa\)
      • \(C_{01} = \) 0.6809 \(Pa\)
      • \(C_{20} = \) 1.19e-4 \(Pa\)
      • \(D_{1} = \) 1e-6 \(1/Pa\)

    Boundary Conditions:

    • Constraints:
      • Face ABFE with zero x-displacement
      • Face AEHD with zero y-displacement
      • Face BFGC with zero y-displacement
      • Face ABCD with zero z-displacement
      • Face DCGH with imposed 4 \(m\) x-displacement

    Reference Solution

    The reference solution is of the experimental type and was extracted from [Treloar]\(^1\). It corresponds with the nominal stress-strain material curve. The values were extracted using WebPlotDigitizer.

    Result Comparison

    Comparison of the nominal stress-strain curves computed from reaction forces on the faces with zero displacements, versus the reference data is shown in Figure 3:

    nominal stress strain result curves comparison for planar validation case
    Figure 3: Nominal stress-strain curves comparison

    Following is a plot of the final deformed shape from the Neo-Hooke case results:

    deformed shape color plot for planar validation case
    Figure 4: Final deformed shape of the cube, with color representing deformation magnitude for the Neo-Hooke case

    References

    • L. R. G. Treloar, “Stress-strain data for vulcanised rubber under various types of deformation”, Trans. Faraday Soc., 40:59–70, 1944.

    Note

    If you still encounter problems validating you simulation, then please post the issue on our forum or contact us.

    Last updated: August 2nd, 2021

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