(b)
1st Loading level
1st Loading level
1st Loading level
2nd Loading level
2nd Loading level
2nd Loading level
Cycles to fracture Nf
Tests
σO1 MPa Blocks B1 Cycles/block N1 σO2 MPa Blocks B2 Cycles/block N2
425 16 1000 415 15 5000 91780 T1
10 400 10 10000 107319 T2
10 385 10 20000 207811 T3
387.5 14 15000 425 14 1 229957 T4
16 16 10 262769 T5
13 13 100 199179 T6