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Table 508.1

Nominal Fatigue Life
100 Microstrain Zero-Shift

Gage Series Strain Level, Number of Cycles
CEA
+ 1500
+ 1300
10 5
10 6
EA
+ 1500
+ 1200
10 6
10 8
ED
+ 2500
+ 2200
10 6
10 7
EK
+ 1800
+ 1500
10 7
10 8
EP
+ 1500
+ 1000
10 2
10 4
J2A
+ 1700
+ 1500
10 6
10 7
J5K
+ 2000
+ 1800
10 7
10 8
N2A
+ 1700
+ 1500
10 6
10 7
N2K
+ 1800
+ 1500
10 7
10 8
N3K
+ 1500
10 8
SA
+ 1800
+ 1500
10 6
10 7
SK
+ 2200
+ 2000
10 6
10 7
S2K
+ 1800
+ 1500
10 6
10 7
SD
+ 2500
+ 2200
10 6
10 8
TA
+ 1700
+ 1500
10 6
10 7
TK
+ 2200
+ 2000
10 7
10 8
TD
+ 2400
10 7
WA
+ 1800
+ 1500
10 6
10 7
WK
+ 2400
+ 2200
10 6
10 7
WD
+ 3000
+ 2500
10 5 *
10 7 *

* 300 zero-shift (approximately) for WD-Series strain gages.

The above fatigue life data is based on fully reversed strain levels. As a generalized approximation, this table can be used for unidirectional strains, or various mean-strains, by taking the indicated peak-to-peak amplitude and derating by 10 percent. As an example, + 1500 would be equivalent in gage fatigue damage to strain levels of +2700 and 0 or 0 and -2700 or +2500 and -200 . A mean-strain which increases in a tensile direction during cycling will lead to much earlier failure, however.

Appendix
For detailed fatigue test data in graphical form see:
     WK-Series
     EA-Series (06 S-T-C)
     EA-Series (13 S-T-C)
     WA-Series (Low Resistance)
     WA-Series (High Resistance)
     WD-Series
     S2K-Series


Reference Table