JANCAE / material modeling working group


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Hyperelastic & Viscoelastic Data Base
for Rubber-like materials

Chairman of the material modeling working group of JANCAE
Hiroto Ido

The Japan Association for Nonlinear CAE (JANCAE) has devoted itself, since launching of its activities in 2001, primarily to conduct a long series of workshop through these years focusing the nonlinear CAE. Cumulating total over 2,200 engineers actually participated to this workshop through 2001 to 2005. This workshop is so designed that every person belonging to this workshop can share common opportunity and facilities based on an well organized scheme to strengthen each one’s understanding of the nonlinear computational dynamics and the CAE technologies in practical use.

Assembled here is an impressive array of specialist engineers and researchers from various industrial or academic fields. They have in common vital and active interest in this special branch of the CAE technology. In order to set up a regular action base, a working group was established in 2005, as a subassembly of JANCAE. It is with the idea of encouraging and accelerating the exchange of information and opinions on our subject that this working group was organized. As the first roll of this group, the continuous study is being carried out to find how skillfully we can model rubber material so that any chosen general purpose FEM code like Abaqus, Adina, Ansys, LS-DYNA or MSC.Marc can be utilized to perform simultaneously cycles of the simulations for both the static and dynamic behavior of structures made of rubber-like materials.

This working group is organized to review and evaluate the following items:

  1. To understand in-depth of theoretical background to the constitutive models of rubber materials.
  2. To gather material characteristic data (e.g., stress-strain curves) through performing a series of experimental testing under various physical conditions.
  3. To build a CAE database for characteristics of rubber materials (e.g., stress-strain curves, material parameters of the constitutive model of rubber implemented in some commercial FEM codes (Abaqus, Ansys, LS-DYNA, or MSC.Marc,), supplemented with respective sample data decks to each of those codes and other useful data).
  4. To compile and sort the information associated with CAE technologies, and the specific characteristics of rubber-like materials brought from broadly over the related fields.

We have already built the first version of the database in a form of electric data of material data so far as we obtained to date, and we are continuously maintaining this database to keep it mostly updated. This database has been opened for the use exclusively only by the registered member of this working group. This working group is kept to be organized constantly in the size of around 50 members from the beginning to date, and has continuously acted since its establishment in 2005.

If you are registered to be a member to this working group, you are required to bear the membership dues which may compensate the cost needed for material testing. In accordance with the agreement between JANCAE and the members, the database that is built-up by the activities of the working group and the proprietary to JANCAE is strictly prohibited to disclose to the outside of JANCAE for a three years period after it is assigned to be a specific annual edition.

However, JANCAE itself is an open organization dedicating to develop the CAE technology, and accordingly it is the policy for JANCAE to disclose the achievement accomplished through a great collaboration by the associated members to common use at an appropriate timing with a basic interval every four years. Then, the year of 2009 is the first opportunity in releasing of the 2005 edition, as the first edition, of this database.

This edition of the database is directly associated with the data for the characteristics in hyperelastic and/or viscoelastic behaviors of rubber or rubber-like materials as titled in this subject. Following the database of 2005 edition, the subsequent editions in and after 2006 will follow with the storage of further addition/deletion/modification of data fed by this working group and will be scheduled to be opened to general use by turns appropriately.

It is our confident that the outcome of this gathering will greatly contribute for progressing in the nonlinear CAE practice particularly with use of rubber-like materials. Please be encouraged to utilize all data available in this database to promote your own study case.

2005

Target material

  • A) Natural Rubber
    • Material A) Hardness: 50, tan δ: 0.03
    • Material B) Hardness: 65, tan δ: 0.05
    • Material C) Hardness: 50, tan δ: 0.20
    • Material D) Hardness: 65, tan δ: 0.27
  • B) Silicon rubber (Room Temperature Vulcanization)
    • Material E) Hardness: ASKER C 33 (SRIS 0101)
    • Material F) Hardness: ASKER C 52.5 (SRIS 0101)

Material Testing

  • A) Tension test --> (stress-strain curve)
    1. uni-axial test (see photo-1)
    2. strip-biaxial tension test (see photo-2)
    3. equi-biaxial test (see photo-3)
      Conditions: stress (50% -- max:400%), load velocity ( 0.6mm/s, 2mm/s, 20mm/s)
  • B) Visco-elastic test --> (master curve)
    • visco-elastic test (see photo-4)
      (Frequency: 0.1Hz -- 100Hz, Temparature: -100 -- 100 degree(Celsius))

Curve fitting data (Coefficients for the numerical modeling)/ sample data deck

  • Mooney Rivlin model (Abaqus, ADINA, AMSYS, LS-DYNA, MSC.Marc)
  • Ogden model (Abaqus, ADINA, AMSYS, LS-DYNA, MSC.Marc)
  • Prony series model (Abaqus, ADINA, AMSYS, LS-DYNA, MSC.Marc)

2006

Dynamic shearing test

Target material

  • A) Natural Rubber
    • Material A) Hardness: 50, tan δ: 0.03
    • Material B) Hardness: 65, tan δ: 0.05
    • Material C) Hardness: 50, tan δ: 0.20
    • Material D) Hardness: 65, tan δ: 0.27

Conditions:

  • Temperature : -5 degree(Celsius), 23 degree(Celsius), 40 degree(Celsius)
  • Frequency : 0.2Hz, 0.5Hz, 1.0Hz, 2.0Hz, 5.0Hz, 10.0Hz, 15Hz
  • Strain : 25%, 50%, 100%, 150%, 200%, 250%, 300%

Curve fitting data / sample data deck

  • Prony series model (Abaqus, ADINA, LS-DYNA, MSC.Marc)