fp#

Fatigue.fp(stitm='', c1='', c2='', c3='', c4='', c5='', c6='', **kwargs)#

Defines the fatigue S vs. N and Sm vs. T tables.

Mechanical APDL Command: FP

Parameters:
stitmint or str

Starting item number for entering properties (defaults to 1). If 1, data input in field C1 of this command is entered as the first item in the list; if 7, data input in field C1 of this command is entered as the seventh item in the list; etc. If the item number is negative, C1 - C6 are ignored and the item is deleted. If -ALL, the table is erased. Items are as follows (items 41-62 are required only if simplified elastic-plastic code calculations are to be performed):

  • 1,2,...20 - N1, N2,… N20

  • 21,22,...40 - S1, S2,… S20

  • 41,42,...50 - T1, T2,… T10

  • 51,52,...60 - Sm1, Sm2,…, Sm10

  • 61 - M (first elastic-plastic material parameter)

  • ``62, `` - N (second elastic-plastic material parameter)

c1str

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

c2str

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

c3str

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

c4str

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

c5str

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

c6str

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

Notes

Defines the fatigue alternating stress (S) vs. cycles (N) table and the design stress-intensity value (Sm) vs. temperature (T) table. Can also be used to modify any previously stored property tables. Log-log interpolation is used in the S vs. N table and linear interpolation is used in the Sm vs. T table. Cycles and temperatures must be input in ascending order; S and Sm values in descending order. Table values must be supplied in pairs, that is, every N entry must have a corresponding S entry, etc. Not all property pairs per curve need be used. If no S vs. N table is defined, the fatigue evaluation will not produce usage factor results.

Warning

This command is archived in the latest version of the software.