Table 3 Parameters related to fatigue damage.

From: Fatigue failure of prefabricated crack HTPB(hydroxyl-terminated polybutadiene) propellant under strain control

Specimen

\(\:{\epsilon\:}_{1}\)

\(\:\varDelta\:{T}_{s1}\)°C

\(n\)

\(\:{\epsilon\:}_{2}\)

\(\:\varDelta\:{T}_{s2}\)°C

Predicted life

Actual life

Correlation

1

0.25

20

153,345

0.2

32.6

34,566

33,985

98.3%

2

0.25

19.8

103,543

0.2

33.9

41,169

39,985

97.0%

3

0.25

19.7

99,765

0.2

34.0

68,954

62,859

90.3%

4

0.25

20

86,259

0.2

34.6

75,945

70,695

92.6%

5

0.25

20

96,845

0.2

32.8

85,249

87,595

97.3%

  1. Note: \(\:{\epsilon\:}_{1}\) is the maximum strain of the first stage, \(\:\varDelta\:{T}_{s1}\) is the initial temperature, \(\:n\) is the number of fatigue load cycles, \(\:{\epsilon\:}_{2}\) is the maximum strain of the second stage, and \(\:\varDelta\:{T}_{s2}\) is the temperature rise after cycling.
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