Workbench - Mechanical Structural Nonlinearities Hyperelasticity

•The following will be covered in this Chapter:

–Background on Elastomers

–Theory of hyperelasticity

–Curve fitting procedure

–Reviewing Results

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•The capabilities described in this section are generally applicable to ANSYS Structural licenses and above.

–Exceptions will be noted accordingly

•Elastomers are a class of polymers with the following properties

–Elastomers involve natural and synthetic rubbers, which are often amorphous and are comprised of long molecular chains

•The molecular chains are highly twisted, coiled, and randomly oriented in an undeformed state

•These chains become partially straightened and untwisted under a tensile load

•Upon removal of the load, the chains revert back to their original configuration

–Rubber elasticity is due mainly to reduction in entropy (i.e., reduction in the number of possible configuration of chains).

•This is unlike metals, for example, where elastic behavior is due to stretching of molecular bonds (see Chapter 5).

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