Dynamic constitutive model of limestone under shock load

摘要

To study the impact properties of limestone subjected to shock load, stress-time curves in different impact velocity were measured by one-stage light-gas gun experimental device. The Lagrange analysis method was used to process the stress-time curves, and the distributions of mechanical parameters against time and space in the flow field were obtained, then the stress-strain experimental curves were obtained also. Based on the experimental research and Lagrange analysis, the dynamic constitutive behavior of limestone under shock load was analyzed. At last, a visco-elastic damage constitutive Equation was established by visco-elastic theory and damage evolution of rate type. Numerical fitting indicates that theoretical prediction is good agreement with experiment.