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This is a simplified bumper model with base acceleration. It shows how to fatigue analysis for sine sweep testing with *FREQUENCY_DOMAIN_SSD_FATIGUE and how to postprocess with *DATABASE_FREQUENCY_BINARY_D3SSD and *DATABASE_FREQUENCY_BINARY_D3FTG. Example 5.5 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
Keywords
*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*DATABASE_FREQUENCY_BINARY_D3FTG
*DATABASE_FREQUENCY_BINARY_D3SSD
*DEFINE_CURVE
*ELEMENT_SOLID
*END
*FREQUENCY_DOMAIN_SSD_FATIGUE
*KEYWORD
*MAT_ADD_FATIGUE
*MAT_ELASTIC
*NODE
*PART
*SECTION_SOLID
*SET_NODE_LIST
*FREQUENCY_DOMAIN_SSD_FATIGUE
1 15 0. 90000. 0
0.03
3 3 2001 2002
*DATABASE_FREQUENCY_BINARY_D3SSD
1
200.0 1500.0 14
*DATABASE_FREQUENCY_BINARY_D3FTG
1
*MAT_ADD_FATIGUE
227 400
*CONTROL_IMPLICIT_GENERAL
1 1.000000 0 0 0 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
1 0 0 0.000 0.000 0.000 0.000 0.000
0 0 0 0
0 0 0.000 1 2
*CONTROL_IMPLICIT_EIGENVALUE
15 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0 1
*BOUNDARY_SPC_SET
1 0 1 1 1 1 1 1
*DEFINE_CURVE
2001 0 1.000000 1.0 0.000 0.000 0
100.000000 9.81E+03
2000.00000 9.81E+03
*DEFINE_CURVE
2002 0 1.000000 1.0 0.000 0.000 0
100.000000 6.00E+02
2000.00000 6.00E+02
*DEFINE_CURVE
400
8000 1.e+02
80000 1.e+01
800000 1.e+00
8000000 1.e-01
80000000 1.e-02
800000000 1.e-03
8000000000 1.e-04
*DEFINE_CURVE
14 0 0.0 0.0 0.0 0.0 0 0
0.0 0.896
0.19 0.896
0.8 0.897
0.81 140.0
0.84 222.8
*ELEMENT_SOLID
*NODE
*SET_NODE_LIST
*PART
f_ob_bumper_ft_foam
227 227 227 0 0 0 0 0
*SECTION_SOLID
227 18 0
*MAT_ELASTIC
227 1.475E-09 20700.0 0.3
*END
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