Stress/MPa

Strain/

(×10−3)

measure point 1#

measure point 2#

measure point 3#

measure point 4#

measure point 5#

measure point 6#

Wave velocity

/km/s

Wave velocity

/km/s

Wave velocity

/km/s

Wave velocity

/km/s

Wave velocity

/km/s

Wave velocity

/km/s

0

0

3.04

3.03

3.06

3.36

3.36

3.41

0.99

0.93

3.08

3.05

3.07

3.39

3.40

3.42

1.98

1.58

3.11

3.05

3.07

3.41

3.40

3.43

2.82

2.19

3.12

3.06

3.09

3.42

3.39

3.42

3.69

2.95

3.09

3.05

3.09

3.39

3.40

3.43

Specimen surface cracks (4.69)

3.64

3.01

2.95

2.99

3.36

3.37

3.39

Crack extension stage 1

(5.42)

4.53

2.97

2.74

2.85

3.21

3.10

3.20

Crack extension stage 2

(7.48)

5.28

2.89

2.69

2.78

3.23

3.04

3.16

Crack extension stage 3

(9.48)

6.17

2.87

2.56

2.68

3.13

3.04

3.14

Specimen damage

8.06

2.58

2.59

2.61

2.59

2.67

2.97