|
|
|
| Mechanical Behavior and Failure Mechanism of Ice at Cryogenic Temperatures under Uniaxial Compression |
|
|
|
|
Abstract By using an Instron 5848 material testing machine and a split Hopkinson pressure bar (SHPB) with cooling chambers, a series of uniaxial compression experiments were carried out to explore the mechanical behaviors and failure mechanism of polycrystalline ice at temperatures of -10/ -20 /-30℃ and at strain rates in the range of 10-4S-1 to 102S-1. The reliability and effectiveness of the experimental results were analyzed. The experimental results show as follows. The compressive strength of ice is sensitive to temperature and strain rate obviously. It also increases with the increase of strain rate and the decrease of temperature. There is a linear relationship between the compressive strength and the logarithm of strain rate. The increase of strain rate enhances the strengthening effect of the compression strength due to the decrease of temperature. Within the studied strain rate and temperature scope, the ice mainly has three types of failure modes, namely expansion, longitudinal splitting and holistic crushing. The different ice failure modes and the increase of compressive strength are caused by the energy of the crack tip can not be released in time, the increase of the hydrogen bond strength and the friction resistance of the crack slipping in the ice.
|
|
Received: 03 January 2018
Published: 28 October 2018
|
|
|
|
|
|
|
|
|
2018, Vol. 39 
