玻璃陶瓷(MACOR)拉伸强度率相关性的研究

Study on Rate Dependence of the Tensile Strength of Machinable-glass-ceramic(MACOR)

掌握玻璃陶瓷MACOR的拉伸性能,对于其在航空航天、国防和其它工程中的应用,以及材料科学本身而言具有重要价值。巴西圆盘实验方法被用于研究加载速率对MACOR拉伸强度的影响。静态实验是在MTS试验机上完成的,动态实验是在6.35 mm SHPB实验装置中完成的。脉冲整形技术被用于实现试件两端力的动态平衡,以消除惯性效应的影响,从而实现准静态应力分析。实验结果表明,MACOR的拉伸强度与加载率相关,拉伸强度作为加载率的函数,当加载速率从0增加到5 780 GPa/s时,MACOR的拉伸强度从26 MPa增大到50 MPa。

The Brazilian disk（BD） test was used to investigate the rate dependence of the tensile strength of glass-ceramic Macor.The static measurement was conducted with a servo-controlled material testing machine and the dynamic experiment was carried out with a 6.35 mm diameter split Hopkinson pressure bar（SHPB） system.The pulse-shaping technique was used to achieve dynamic force balance,eliminate the loading inertial effect,and enable quasi-static stress analysis.The experimental results showed that the tensile strength of Macor is loading rate dependent,the tensile strength,as a function of loading rate,increases from 26 MPa to 50 MPa as the loading rate is increased from zero to 5 780 GPa/s.