Table 2 Theoretical ultimate load and applied load when visible crack occurs for each specimen
Specimen | L1 (cm) | L2 (cm) | Δt (s) | \( {C}_p=\frac{\left|{L}_1-{L}_2\right|}{\Delta t} \) (m/s) | ΔCp (m/s) |
|---|---|---|---|---|---|
Group 1 | 60 | 30 | 0.000085 | 3529.41 | 3529 |
70 | 20 | 0.000142 | 3521.13 | ||
80 | 10 | 0.000196 | 3571.43 | ||
Group 2 | 60 | 30 | 0.000083 | 3614.46 | |
70 | 20 | 0.000144 | 3472.22 | ||
80 | 10 | 0.000202 | 3465.35 |