/TH/SPRING
Block Format Keyword Describes the time history for springs.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/TH/SPRING/thgroup_ID | |||||||||
thgroup_name | |||||||||
var_ID1 | var_ID2 | var_ID3 | var_ID4 | var_ID5 | var_ID6 | var_ID7 | var_ID8 | var_ID9 | var_ID10 |
elem_ID | elem_name |
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_ID1, ...n | Variables saved for
TH (see table below) (Character, maximum 8 characters) |
|
elem_ID | Element
identifier (Integer) |
|
elem_name | Name of the element to
appear in the time history (Integer, maximum 80 characters) |
TH Output Keyword & Variables
Keyword | Object Saved | Variables |
---|---|---|
SPRING | Springs | OFF, FX, FY, FZ, MX, MY, MZ, LX, LY, LZ, RX, RY, RZ, IE, F1, F2, LENGTH, FAIL |
Table of Available Variables - Part 2
Keyword | Variable Group | Saved TH Variables |
---|---|---|
SPRING | DEF | OFF, FX, FY, FZ, MX, MY, MZ, LX, LY, LZ, RX, RY, RZ, IE, LENGTH |
Output for Spring
- OFF: element flag for deactivation 4
- FX: force in direction X
- FY: force in direction Y
- FZ: force in direction Z
- F1 and F2 (only available for /PROP/TYPE12 (SPR_PUL)) are internal forces of each spring force.
- MX: moment in direction X
- MY: moment in direction Y
- MZ: moment in direction Z
- LX: elongation in direction X 7
- LY: elongation in direction Y 7
- LZ: elongation in direction Z 7
- RX: rotation around X axis in radians
- RY: rotation around Y axis in radians
- RZ: rotation around Z axis in radians
- IE: internal energy
- LENGTH: total length
- FAIL: fail criterion
Comments
- The available names are listed in
the two tables above.
In the first table, TH-variables are listed. When a TH-variable is requested, this variable is written.
In the second table, other variable groups are listed. When a variable group is requested, all the associated TH-variables are written at once.
- For all spring properties except /PROP/TYPE8 (SPR_GENE), /PROP/TYPE28 (NSTRAND) and /MAT/LAW108 (SPR_GENE), the forces and moments are specified in the local element system. The element system is defined with the spring nodes, or the local skew defined in the property.
- For the spring /PROP/TYPE8 (SPR_GENE) or /MAT/LAW108 (SPR_GENE), the forces and moments are specified in the global system; unless a local skew is defined in the property. In this case, the forces and moments are specified in the defined local system.
- OFF:
- 0.0 deleted element
- 1.0 active element
- 2.0 (shells / solids): active element using small strain
- Negative value -1/-2 if the element is in 'stand-by' mode due to rigid body
Some intermediate values can be found during few cycles before element deletion (progressive decrease of off during a few cycles is applied as a multiplicative factor to the stress, so the stress progressively vanishes, and element is deleted after ~ 10 cycles). This process applies to some element types, but not all.
- LENGTH:Output of the total length of the spring computed considering the coordinates of the two nodes 1 and 2 defining the spring as:
(1) For pulley springs /PROP/TYPE12 (SPR_PUL), a third node is used to define the spring, with the middle node representing the pulley. In this particular case, the total length corresponds to the sum of the length between nodes 1 and 2, and the length between nodes 2 and 3 as:(2) - FAIL:
Output of the failure criterion value for /PROP/TYPE8 (SPR_GENE), /PROP/TYPE13 (SPR_BEAM), /PROP/TYPE23 (SPR_MAT) (+ /MAT/LAW108 (SPR_GENE) or /MAT/LAW113 (SPR_BEAM)) and /PROP/TYPE25 (SPR_AXI)). This value goes from 0 (undamaged spring) to 1 (failure of the spring).
- For spring type 29, 30, 31, 32, 35, 36, 44, 45 and 46 the output is elongation speed of the spring.