(a)
Test
Type
1st Loading level
1st Loading level
1st Loading level
2nd Loading level
2nd Loading level
2nd Loading level
Cycles to fracture Nf
σO1 MPa
NF1
N1
σO2 MPa
NF2
N2
1 H-L 432.5 39665 25002 390 194968 37171 62173
2 L-H 390 194968 100005 432.5 39665 33411‘ 133416