/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      

Definitions

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

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

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 5
  • LY: elongation in direction Y 5
  • LZ: elongation in direction Z 5
  • RX: rotation around X axis in radians
  • RY: rotation around Y axis in radians
  • RZ: rotation around Z axis in radians
  • IE: internal energy

Comments

  1. 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.

  2. For all spring properties except /PROP/TYPE8 (SPR_GENE), /PROP/TYPE28 (NSTRAND) and /MAT/LAW108 (SPR_GENE), the forces and moments are given in the local element system. The element system is defined with the spring nodes or the local skew defined in the property.
  3. For the spring /PROP/TYPE8 (SPR_GENE) or /MAT/LAW108 (SPR_GENE), the forces and moments are given in the global system; except when a local skew is defined in the property. In this case, the forces and moments are given in the defined local system.
  4. OFF:
    • 0.0 deleted element
    • 1.0 active element
    • 2.0 (shells / solids): active element using small strain
    • Negative value -1/-2 when the element is on stand-by due to rigid body

    Some intermediate values can be found during few cycles before element deletion (progressive reduction of off during a few cycles applies as a multiplicative factor to the stress, so that the stress is progressively vanished and element is deleted after ~ 10 cycles). This process applies to some element types, but not all.

  5. For spring type 29, 30, 31, 32, 35, 36, 44, 45 and 46 the output is elongation speed of the spring.