摘要
为了测试陶瓷材料动态断裂韧性,利用Hopkinson压杆实验原理和改装的Hopkinson压杆装置,并将试件加工成单边切口梁进行了三点弯曲动态试验.利用改装的Hopkinson压杆装置可直接测得透射应力波,从而直接得到试件变形过程中作用在试件上的支反力.本文定义了无量纲挠度和挠度变化率,给出了几种陶瓷材料在不同挠度变化率下的时间-动态应力强度因子曲线,并分别给出其动态断裂韧性.测试结果表明,陶瓷材料的动态断裂韧性具有挠度变化率效应.
To measure the dynamic fracture toughness of ceramics,a revised Hopkinson test device with the principle of compressive Hopkinson bar and the method of beam notched at one-side was used.The transition waves and the support forces loaded at specimens were measured.A dimensionless deflection and deflection rate were defined and some curves of dynamic stress strength factor vs time under various deflection rates were given,and some dynamic fracture toughness of ceramics were determined from these curves.The measurement results showed that the deflection rate had intense effect on the dynamic fracture toughness of ceramic.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2011年第1期32-35,共4页
Materials Science and Technology
