混凝土与岩石类脆性材料的动态破坏机制研究

Study on the dynamic failure mechanism of concrete and stone brittle matericals

通过SHPB(分离式霍普金森压杆)装置对混凝土和岩石进行五种不同应变率下的动态压缩试验,得出了两种材料的基本动态力学参数,发现动态抗压强度、峰值应变都随应变率的增大而线性增加或呈二次函数增加,引入比能量吸收对材料的动态破坏机制进行研究,得出两类材料的动态破坏机制实际上就是材料在吸收冲击荷载能量后的一个动态失稳过程,吸收的能量越大,破坏越严重,且材料的能量吸收性质是由材料本身特性和应变率决定的。

With the SHPB device do the dynamic compression test of concrete and stone under 5 different strain rates,figuring out the basic dynamic mechanics parameters could find that the dynamic strength and strain rate in a linear relationship,the peak strain and strain rate with relationship of a quadratic function relation.It could use specific energy absorption to study the failure mechanism of specimens,and could draw a conclusion that the failure mechanism of this two materials actually was a dynamic instability process after the material absorbing shock load energy,and the more energy it absorbing the more serious damage would be,in addition the energy absorption properties of materials was determined by material itself characteristic and the strain rate.