Hyperelastic constants from a modified hardness test using energy balance obtained from FE-analysis
Författare
Summary, in English
Manufacturing test specimens, testing them in the laboratory and evaluat-
ing material parameters for finite element analysis is costly and time consum-
ing. In order to simplify the hyperelastic characterisation of rubber materials
an extension of the standard hardness test is here proposed. A number of
indentation depths are chosen for the hardness test and the indentation forces
for these depths are recorded. It is suggested that by this modification, hyper-
elastic constants can be derived from the test. More information can thereby
be provided from the test by a small extra effort. The method is based on
an equivalence of the work done by the external force of the indentor and
the strain energy stored in the rubber material. Displacement control and
the incompressible nature of rubber reduces the problem of determining the
hyperelastic constants to finding a solution to a system of equations with
these constants as unknowns. The method is theoretically evaluated here us-
ing finite element analysis and hyperelastic constants from three real rubber
materials with hardness from 40 to 78 IRHD. The evaluation indicates that
the method can produce hyperelastic constants with good accuracy using this
simple method.
ing material parameters for finite element analysis is costly and time consum-
ing. In order to simplify the hyperelastic characterisation of rubber materials
an extension of the standard hardness test is here proposed. A number of
indentation depths are chosen for the hardness test and the indentation forces
for these depths are recorded. It is suggested that by this modification, hyper-
elastic constants can be derived from the test. More information can thereby
be provided from the test by a small extra effort. The method is based on
an equivalence of the work done by the external force of the indentor and
the strain energy stored in the rubber material. Displacement control and
the incompressible nature of rubber reduces the problem of determining the
hyperelastic constants to finding a solution to a system of equations with
these constants as unknowns. The method is theoretically evaluated here us-
ing finite element analysis and hyperelastic constants from three real rubber
materials with hardness from 40 to 78 IRHD. The evaluation indicates that
the method can produce hyperelastic constants with good accuracy using this
simple method.
Avdelning/ar
Publiceringsår
2012
Språk
Engelska
Publikation/Tidskrift/Serie
Plastics, Rubber and Composites: Macromolecular Engineering
Dokumenttyp
Artikel i tidskrift
Ämne
- Applied Mechanics
- Building Technologies
Status
Submitted