Influence of freezing temperature and cotton content of ice on dynamic mechanical properties and energy dissipation

The dynamic compression mechanical properties of ice are strongly influenced by the impurity and environmental temperature. Artificial ice specimens are prepared by adding different content of cotton (0, 0.3 and 0.5%) in distilled water and controlling the freezing temperature (- 10, - 20 and - 30 degrees C). Then, dynamic compression experiments are carried out by Split Hopkinson Pressure Bar combining with high speed camera. The results show that the compressive strength of ice specimens containing cotton increases with the impact velocity under same freezing temperature. When the impact velocity is low, axial cracks are observed on specimen surfaces during loading process and integrity is maintained; when the impact velocity is high, obvious plastic deformation of specimen is found due to the dislocation movement along oblique crack. The incident energy, reflected energy and dissipated energy of specimens with different cotton content at same freezing temperature are positively correlated with impact velocity. Generally, the reflected energy is less than the transmission energy if morphological integrity can be obtained; when the specimen is seriously damaged, the reflected energy is greater than the transmission energy.

Automated summary

The dynamic compression mechanical properties of ice are greatly affected by impurities and environmental temperature. Adding cotton to ice specimens increases their compressive strength under the same freezing temperature. At low impact velocities, axial cracks are observed with integrity maintained; at high impact velocities, significant plastic deformation occurs due to dislocation movement along oblique cracks. The energy characteristics of specimens with different cotton content are positively correlated with impact velocity.