/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

  1. 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.

  2. 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.
  3. 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.
  4. 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.

  5. 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)
    L E N G T H = ( x 2 − x 1 ) 2 + ( y 2 − y 1 ) 2 + ( z 2 − z 1 ) 2 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamitaiaadw eacaWGobGaam4raiaadsfacaWGibGaeyypa0ZaaOaaaeaacaGGOaGa amiEamaaBaaaleaacaaIYaaabeaakiabgkHiTiaadIhadaWgaaWcba GaaGymaaqabaGccaGGPaWaaWbaaSqabeaacaaIYaaaaOGaey4kaSIa aiikaiaadMhadaWgaaWcbaGaaGOmaaqabaGccqGHsislcaWG5bWaaS baaSqaaiaaigdaaeqaaOGaaiykamaaCaaaleqabaGaaGOmaaaakiab gUcaRiaacIcacaWG6bWaaSbaaSqaaiaaikdaaeqaaOGaeyOeI0Iaam OEamaaBaaaleaacaaIXaaabeaakiaacMcadaahaaWcbeqaaiaaikda aaaabeaaaaa@52EF@
    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)
    L E N G T H = ( x 2 − x 1 ) 2 + ( y 2 − y 1 ) 2 + ( z 2 − z 1 ) 2 + ( x 3 − x 2 ) 2 + ( y 3 − y 2 ) 2 + ( z 3 − z 2 ) 2 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamitaiaadw eacaWGobGaam4raiaadsfacaWGibGaeyypa0ZaaOaaaeaacaGGOaGa amiEamaaBaaaleaacaaIYaaabeaakiabgkHiTiaadIhadaWgaaWcba GaaGymaaqabaGccaGGPaWaaWbaaSqabeaacaaIYaaaaOGaey4kaSIa aiikaiaadMhadaWgaaWcbaGaaGOmaaqabaGccqGHsislcaWG5bWaaS baaSqaaiaaigdaaeqaaOGaaiykamaaCaaaleqabaGaaGOmaaaakiab gUcaRiaacIcacaWG6bWaaSbaaSqaaiaaikdaaeqaaOGaeyOeI0Iaam OEamaaBaaaleaacaaIXaaabeaakiaacMcadaahaaWcbeqaaiaaikda aaaabeaakiabgUcaRmaakaaabaGaaiikaiaadIhadaWgaaWcbaGaaG 4maaqabaGccqGHsislcaWG4bWaaSbaaSqaaiaaikdaaeqaaOGaaiyk amaaCaaaleqabaGaaGOmaaaakiabgUcaRiaacIcacaWG5bWaaSbaaS qaaiaaiodaaeqaaOGaeyOeI0IaamyEamaaBaaaleaacaaIYaaabeaa kiaacMcadaahaaWcbeqaaiaaikdaaaGccqGHRaWkcaGGOaGaamOEam aaBaaaleaacaaIZaaabeaakiabgkHiTiaadQhadaWgaaWcbaGaaGOm aaqabaGccaGGPaWaaWbaaSqabeaacaaIYaaaaaqabaaaaa@6AF3@
  6. 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).

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