***elastic_energy#

This command is now obsolete, please have a look at ***energy_monitoring.

Description#

This option indicates that a calculation of the global elastic strain energy should be made and output. This calculation gives the following energy calculation for the structure:

(62)#\[\frac{1}{2}\int_V \ten{\sigma}:\tenf D^{-1}:\ten{\sigma}\quad dV\]

where \(\tenf D\) is the elastic matrix extracted from the the material behavior.

The result of this the elastic energy is stored in a formatted ASCII file named problem.elastic_energy. The output is sequential, with one line per increment of the calculation.

Syntax#

***elastic_energy elset-name [ **frequency frequency ] [ **precision precision ]

elset-name

is a character name for the element set over which the strain energy is calculated. The predefined element set ALL_ELEMENT may be used to declare the entire structure.

frequency

may be used to specify when the energy is computed (by default, it is made at each increment). This option has the same syntax as output frequency (see ***output **frequency).

precision

is an integer specifying how many significant digits are used in the output file (default is 6).

Example#

From $Z7TEST/Energy_test/INP/elastic_energy1.inp

***elastic_energy ALL_ELEMENT