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FATLOAD |
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FATLOAD |
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»Click here to display Table of Contents«
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FATLOAD |
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FATLOAD |
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FATLOAD - Fatigue Load
Defines fatigue loading parameters.
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
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(10) |
FATLOAD |
ID |
TID |
LCID |
LDM |
Scale |
Offset |
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Field |
Contents |
ID |
Each FATLOAD card must have a unique ID. This identifier may be referenced by a FATEVNT definition. No default (Integer > 0) |
TID |
TABFAT entry identification number. (Integer > 0 or blank) If LCID references a Linear-static subcase, TID should be a positive integer (Integer > 0). If LCID references Transient or Random Response subcase, TID should be blank. |
LCID |
Subcase identification number of a Linear static, Transient, or Random Response subcase. No default (Integer > 0) |
LDM |
The magnitude of the FEA load in the same units as those for the time history. It is ignored in fatigue analyses based on a transient analysis subcase (Comment 2). Default = 1.0 (Real) |
Scale |
Scale factor applied to the load or time history. It is ignored in fatigue analyses based on a transient analysis subcase. Default = 1.0 (Real) |
Offset |
Offset applied to the load or time history. It is ignored in fatigue analyses based on a transient analysis subcase. Default = 0.0 (Real) |
Comments
| 1. | This magnitude is used as a scale factor to normalize the finite element stresses/strains to obtain the stress/strain distribution due to a unit loading. |
| 2. | The sequence below depicts how LDM, Scale and Offset values work together to scale the FEA stress tensor at time t: |
Where, 
is the result stress tensor at time t.
is the stress tensor from static analysis (TID referencing a TABFAT entry is only used for Static subcases. TID should be blank for Transient analysis-based Fatigue Analysis).
P(t) is the y point value of load-time history at time t.
| 3. | This card is represented as a loadcollector in HyperMesh. |