Table 2: Crack initiation loads of specimens with different loading rates obtained from AE results and microscopic visualization monitoring system.

Specimen no.AE monitoringMicroscopic monitoring
Experiment (%)Average (%)Experiment (%)Average (%)

TPB-0.6-179.479.364.271.3
TPB-0.6-276.370.5
TPB-0.6-382.379.1
TPB-1.0-191.188.069.372.7
TPB-1.0-287.575.1
TPB-1.0-385.473.6
TPB-1.4-190.690.474.874.2
TPB-1.4-288.871.6
TPB-1.4-391.876.2
TPB-1.8-185.290.081.277.6
TPB-1.8-289.976.4
TPB-1.8-391.875.3
TPB-3.0-192.592.179.878.5
TPB-3.0-293.280.6
TPB-3.0-390.575.2