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Outline
The dynamic mechanical behavior of ice at high strain rates is crucial for polar engineering safety and ice–structure interaction studies. Based on an improved specimen preparation method and a Split Hopkinson Pressure Bar (SHPB) system, this study conducted high strain rate uniaxial compression tests on pure water ice at −20 ℃ in the range of 1054−1972 s−1. The results show that pure water ice exhibits clear strain rate sensitivity: peak stress increases from 13.2 MPa to 25.1 MPa (≈ 90% increase), while peak strain shows no monotonic trend but remains scattered. Stress-strain curves generally display a sharp-peak profile, followed by rapid decay and the formation of a residual load-bearing platform of 1−7 MPa at strains around 0.05−0.06, with higher strain rates showing a "delayed instability" characterized by slower post-peak decay and higher residual strength. High-speed imaging further reveals a staged failure process of crack initiation, macro-cracking, and granular fragmentation, corresponding to the residual platform. Even under strict specimen screening and temperature control, peak stress still exhibits scatter of about 15%−20% at similar strain rates, suggesting that strain rate alone is insufficient to explain the mechanical response and that future constitutive models should introduce microstructural or statistical parameters. Cross-comparison with existing literature indicates that the present results fall within the established response range but demonstrate higher consistency and reliability due to stricter control of specimen thickness, temperature uniformity, and loading conditions. Overall, this study supplements the high strain rate database of pure water ice at −20 ℃, clarifies its strain rate sensitivity, residual load-bearing mechanism, and staged failure characteristics, and provides experimental evidence for dynamic response analysis and constitutive model development in cold-region engineering.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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