Table 2 The testing schemes for multi-level cyclic loading.

From: Numerical simulation of micro crack evolution and failure modes of limestone under uniaxial multi-level cyclic loading

Groups

Initial stress (\({\text{I}}_{{\text{S}}} )\)/MPa

Amplitude (A)/MPa

Loading cycles in each level (N)

F-4.5-1

13.5 (11.5% \({\upsigma }_{{\text{c}}}\))

4.5 (3.8% \({\upsigma }_{{\text{c}}}\))

1

F-9.0-1

18.0 (15.3% \({\upsigma }_{{\text{c}}}\))

9.0 (7.6% \({\upsigma }_{{\text{c}}}\))

1

F-13.5-1

22.5 (19.2% \({\upsigma }_{{\text{c}}}\))

13.5 (11.5% \({\upsigma }_{{\text{c}}}\))

1

F-4.5-10

13.5 (11.5% \({\upsigma }_{{\text{c}}}\))

4.5 (3.8% \({\upsigma }_{{\text{c}}}\))

10

F-9.0-10

18.0 (15.3% \({\upsigma }_{{\text{c}}}\))

9.0 (7.6% \({\upsigma }_{{\text{c}}}\))

10

F-13.5-10

22.5 (19.2% \({\upsigma }_{{\text{c}}}\))

13.5 (11.5% \({\upsigma }_{{\text{c}}}\))

10

F-4.5-20

13.5 (11.5% \({\upsigma }_{{\text{c}}}\))

4.5 (3.8% \({\upsigma }_{{\text{c}}}\))

20

F-9.0-20

18.0 (15.3% \({\upsigma }_{{\text{c}}}\))

9.0 (7.6% \({\upsigma }_{{\text{c}}}\))

20

F-13.5-20

22.5 (19.2% \({\upsigma }_{{\text{c}}}\))

13.5 (11.5% \({\upsigma }_{{\text{c}}}\))

20

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