This is an example of an aluminium bracket subjected to base excitation. Random fatigue analysis is running with *FREQUENCY_DOMAIN_RANDOM_VIBRATION_FATIGUE using Steinberg’s three band method. *DATABASE_FREQUENCY_BINARY_D3FTG, *DATABASE_FREQUENCY_BINARY_D3PSD and *DATABASE_FREQUENCY_BINARY_D3RMS are used for post-processing of the results. Example 7.1 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
*BOUNDARY_SPC_SET *CONTROL_IMPLICIT_EIGENVALUE *CONTROL_IMPLICIT_GENERAL *CONTROL_IMPLICIT_NONLINEAR *CONTROL_STRUCTURED *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_DEFORC *DATABASE_FREQUENCY_BINARY_D3FTG *DATABASE_FREQUENCY_BINARY_D3PSD *DATABASE_FREQUENCY_BINARY_D3RMS *DATABASE_GLSTAT *DATABASE_JNTFORC *DATABASE_MATSUM *DATABASE_NODOUT *DATABASE_RWFORC *DATABASE_SECFORC *DATABASE_SSSTAT *DEFINE_CURVE *ELEMENT_SHELL *END *FREQUENCY_DOMAIN_RANDOM_VIBRATION_FATIGUE *KEYWORD *MAT_ELASTIC *NODE *PART *SECTION_SHELL *SET_NODE_LIST_TITLE *TITLE
*KEYWORD
*TITLE
Random fatigue analysis: 2014-T6 Al
*FREQUENCY_DOMAIN_RANDOM_VIBRATION_FATIGUE
1 15 0. 90000.
0.03
1 1 0 1 1
3 2001
1 1 8.64e+8
4075 -1 1.e+06 3 1
*DATABASE_FREQUENCY_BINARY_D3PSD
1
0.100 2.000 5
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*DATABASE_FREQUENCY_BINARY_D3FTG
1
*BOUNDARY_SPC_SET
1 0 1 1 1 1 1 1
*SET_NODE_LIST_TITLE
*CONTROL_IMPLICIT_EIGENVALUE
15 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0 1
*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_STRUCTURED
*CONTROL_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_DEFORC
0.100000 0 0 1
*DATABASE_GLSTAT
0.100000 0 0 1
*DATABASE_JNTFORC
0.100000 0 0 1
*DATABASE_MATSUM
1.000000 0 0 1
*DATABASE_NODOUT
0.100000 0 0 1 0.000 0
*DATABASE_RWFORC
1.000000 0 0 1
*DATABASE_SECFORC
0.100000 0 0 1
*DATABASE_SSSTAT
0.100000 0 0 1
*DATABASE_BINARY_D3PLOT
5.000000 0 0 0 0
0
*ELEMENT_SHELL
*NODE
*PART
Recliner Bkt i/b
4075 102760 4204 0 0 0 0 0
*SECTION_SHELL
102760 18 1.000000 3 0 0 0 0
2.500000 2.500000 2.500000 2.500000 0.000 0.000 0.000 0
*MAT_ELASTIC
4204 2.8000E-6 72.400000 0.330000
*DEFINE_CURVE
2001 0 1.000000 3.0 0.000 0.000 0
0.10000000 0.09604
2.00000000 0.09604
*END
