论文部分内容阅读
利用直径75mm的大尺寸SHPB实验装置开展盐岩的动态压缩性能实验研究,得到了其动态应力应变曲线。分析表明,在冲击压缩载荷作用下,盐岩材料有明显的损伤软化现象和应变率效应。针对实验曲线,通过引入描述材料强度随应变率强化的应变率增强因子和随不可逆变形发展而弱化的损伤因子,提出了含损伤率的相关动态本构模型,拟合得到的本构方程形式比较简单,能够较好地反映盐岩动态实验加载过程的主要特征,具有一定的工程应用价值。
The experimental study on the dynamic compressibility of rock salt was carried out by using a large-size SHPB experimental device with a diameter of 75 mm. The dynamic stress-strain curve was obtained. The analysis shows that under the impact compression load, salt rock material has obvious damage softening phenomenon and strain rate effect. Aiming at the experimental curve, the relevant dynamic constitutive model with damage rate is proposed by introducing the strain rate enhancement factor which enhances the strength of material with strain rate and the weakened damage factor with the development of irreversible deformation. The comparison of the constitutive equations It is simple and can reflect the main features of dynamic loading process of rock salt well and has a certain engineering application value.