Measurements of dynamic anti-bending properties of ceramics

The three-point bending test was performed to explore the dynamic anti-bending properties of ceramic materials by the improved Hopkinson pressure bar system. The tested ceramic specimens have different static bending strengths. The dimensionless deflection and deflection rate were defined and the deflection-maximum tensile stress curves for these ceramic materials were obtained under different deflection rates. The dynamic bending strengths of these ceramic materials were determined from the obtained deflection-maximum tensile stress curves. The measured results show that the deflection rate has intense effect on dynamic bending strength of the ceramics. Analyses on the validity of the dynamic three-point bending test and the dynamic damage indicate that the critical dynamic damage factor is related to the deflection rate.