11/03/2014

Workbench - Mechanical Structural Nonlinearities Hyperelasticity

The following will be covered in this Chapter:
Background on Elastomers
Theory of hyperelasticity
Curve fitting procedure
Reviewing Results
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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