/TH/INTER

Block Format Keyword Describes the time history for interfaces.

Format


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/TH/INTER/`thgroup_ID`
thgroup_name
`var_ID`₁	`var_ID`₂	`var_ID`₃	`var_ID`₄	`var_ID`₅	`var_ID`₆	`var_ID`₇	`var_ID`₈	`var_ID`₉	`var_ID`₁₀
`Obj_ID`₁	`Obj_ID`₂	`Obj_ID`₃	`Obj_ID`₄	`Obj_ID`₅	`Obj_ID`₆	`Obj_ID`₇	`Obj_ID`₈	`Obj_ID`₉	`Obj_ID`₁₀

Definition


Field	Contents	SI Unit Example
`thgroup_ID`	`TH` group identifier. (Integer, maximum 10 digits)
`thgroup_name`	`TH` group name. (Character, maximum 100 characters)
`var_ID`₁, ...`n`	Variables saved for `TH` (see table below). (Character, maximum 8 characters)
`Obj_ID`₁, ...`n`	Identifiers of the objects to be saved. (Integer)

TH Output Keyword & Variables


Keyword	Object Saved	Variables
`INTER`	Interface	`FNX`, `FNY`, `FNZ`, `FTX`, `FTY`, `FTZ`, and `SFW`. `\|FNX\|`, `\|FNY\|`, `\|FNZ\|`, `\|\|FN\|\|`, \|`FX\|`, `\|FY\|`, `\|FZ\|`, `\|\|F\|\|`, `MX`, `MY`, `MZ` These absolute force variables are only for interface types /INTER/TYPE7, /INTER/TYPE10, /INTER/TYPE11, /INTER/TYPE19, /INTER/TYPE24, /INTER/TYPE25 and their sub interfaces (/INTER/SUB). `QFRIC` is available for interfaces TYPE7 and TYPE21. `CE_ELAST`, `CE_FRIC`, `CE_DAMP` `CAREA` is available for interfaces TYPE24 and TYPE25.

Available Variable Groups - Part 2


Keyword	Variable Group	Saved TH Variables
`INTER`	`DEF` `FN` `FT` `\|FN\|` `\|F\|`	`FNX`, `FNY`, `FNZ`, `FTX`, `FTY`, `FTZ` `FNX`, `FNY`, `FNZ` `FTX`, `FTY`, `FTZ` `\|FNX\|`, `\|FNY\|`, `\|FNZ\|`, `\|\|FN\|\|` `\|FX\|`, `\|FY\|`, `\|FZ\|`, `\|\|F\|\|`

Output for Interface

CAREA: Surface area in contact. Only available for interfaces TYPE24 and TYPE25.
CE_ELAST: Elastic contact energy which is the recoverable energy stored in the contact penalty springs. Only output when /TH/VERS/2021.
CE_FRIC: Frictional contact energy. Only output when /TH/VERS/2021.
CE_DAMP: Damping contact energy. Only calculated for Interfaces TYPE2, 10, 18, 21, 23 and 25. Only output when /TH/VERS/2021. 2
FNX: normal force in direction X
FNY: normal force in direction Y
FNZ: normal force in direction Z
FTX: tangent force in direction X
FTY: tangent force in direction Y
FTZ: tangent force in direction Z
|FNX| absolute value of normal force of the X-component of the contact force
$\sum | FNX (S, m) |$
$FNX (S, m)$ is the X-component of the normal contact force applied to the main segment $m$ , due to secondary node $S$ .
|FNY|: absolute value of normal force of the Y-component of the contact force
|FNZ|: absolute value of normal force of the Z-component of the contact force
|FX|: absolute value of the X-component of the contact force
$\sum | FX (S, m) |$
$FX (S, m)$ is the X-component of the contact force applied to the main segment $m$ , due to secondary node $S$ .
|FY|: absolute value of the Y-component of contact force
|FZ|: absolute value of the Z-component of contact force
MX: moment around X-axis of global system
MY: moment around Y-axis of global system
MZ: moment around Z-axis of global system
QFRIC: heat created from friction energy
SFW: work of forces along the interface. Only available for interfaces TYPE14 and TYPE15.

Comments

Available names are listed in the two tables above.
- In the first table, TH-variables are listed. If a TH-variable is requested, this variable is written.
- In the second table, other variable groups are listed. If a variable group is requested, all the associated TH-variables are written at once.
Damping energy is computed only for Interfaces TYPE2, 10, 18, 21, 23, and 25. Thus, for other interfaces, it is not taken into account in global contact energy. This is not crucial as damping energy remains small compared to elastic and frictional energy.