【摘要】 用改装的Hopkinson压杆试验装置测试了陶瓷材料3点弯曲动态力学性能;定义了量纲一挠度和挠度变化率,给出了几种陶瓷材料在不同挠度变化率下的挠度-最大拉应力曲线,从而给出其抗弯强度。测试结果说明,陶瓷材料的动态抗弯强度具有挠度变化率效应。分析了3点弯曲动态测试的有效性和动态损伤,分析表明,动态损伤因子临界值具有挠度变化率效应。更多还原

【Abstract】 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.更多还原