This is an example of an aluminium beam with pre-determined notch subjected to base acceleration excitation. Random fatigue analysis is running with *FREQUENCY_DOMAIN_RANDOM_VIBRATION_FATIGUE using Dirlik’s method. *DATABASE_FREQUENCY_BINARY_D3FTG, *DATABASE_FREQUENCY_BINARY_D3PSD and *DATABASE_FREQUENCY_BINARY_D3RMS are used for post-processing of the results. Example 7.2 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_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_FREQUENCY_BINARY_D3FTG *DATABASE_FREQUENCY_BINARY_D3PSD *DATABASE_FREQUENCY_BINARY_D3RMS *DEFINE_CURVE_TITLE *ELEMENT_SHELL *END *FREQUENCY_DOMAIN_RANDOM_VIBRATION_FATIGUE *KEYWORD *MAT_ELASTIC *NODE *PART *SECTION_SHELL_TITLE *SET_NODE_LIST *TITLE
*KEYWORD
*TITLE
Aluminium_beam
*FREQUENCY_DOMAIN_RANDOM_VIBRATION_FATIGUE
1 10 0.000 0.000 0
0.035000 0 0 0.000 0.000 0
1 0 1 0.000000 1 1 1
0 0 0 0.000 1
0 0 3 1 0 0 0 0
2 1 0 1800.00
1 2 0 1 2
*DATABASE_FREQUENCY_BINARY_D3PSD
1
10.000 300.00000 290 0 0
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*DATABASE_FREQUENCY_BINARY_D3FTG
1
*CONTROL_IMPLICIT_EIGENVALUE
10 0.000 0-1.000E+29 01.0000E+29 2 0.000
0 0 0 0 1
*CONTROL_IMPLICIT_GENERAL
1 0.000 2 1 2 0 0 1
*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_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
1.000000 0 0 0 0
0
*BOUNDARY_SPC_SET
1 0 1 1 1 1 1 1
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000MECH
5867 5865 5870 5868 5863 5862 5864 5866
5869 5871 5873 5872 2221 2222 2223 2224
2225 2226 2215 2216 2217 2218 2219 2220
*PART
aluminum_beam
1 1 1 0 0 0 0 0
*SECTION_SHELL_TITLE
beam
1 18 1.000000 3 0 0 0 0
0.001270 0.001270 0.001270 0.001270 0.000 0.000 0.000 0
*MAT_ELASTIC
1 2800.00007.0000E+10 0.330000 0.000 0.000 0
*ELEMENT_SHELL
*NODE
*DEFINE_CURVE_TITLE
PSD_vertical
1 0 0.000 0.000 0.000 0.000 0
10.0000000 0.0400000
25.0000000 0.0400000
50.0000000 0.1320000
150.0000000 0.3320000
170.0000000 0.6000000
200.0000000 0.6000000
250.0000000 0.5340000
280.0000000 0.2668000
300.0000000 0.2000000
*DEFINE_CURVE_TITLE
SN_FAT71
2 0 0.000 0.000 0.000 0.000 0
1.0000000e+005 1.0890000e+008
1.0000000e+008 4.0600000e+007
*END
