人造多晶冰抗压强度实验研究

Experimental Study on the Uniaxial Compressive Strength of Artificial Polycrystalline Ice

对实验室制作的平均粒径为４ｍｍ的宏观各向同性粒状多晶冰，在冰温分别为－０．５、－２、－５和－１０℃及应变率分别为４．２×１０－４、５．５×１０－５、５．５×１０－６及３．５×１０－７ｓ－１下进行了单轴抗压强度实验。结果表明，极限抗压强度与负温和应变率的对数均呈正比例关系；在较高应变率下（４．２×１０－４ｓ－１），在－５℃时，出现韧脆性转折点。

Samples for the polycrystalline ice, which is macroscopically isotropic and with an average grain size of 4mm, are made in laboratory. The uniaxial compressive strength tests are conducted at temperatures of -0.5,-2,-5 an -10℃ respectively and at strain rates of 4.2×10 -4 , 5.5×10 -5 , 5.5×10 -6 and 3.5×10 -7 s -1 respectively. Test results show that the ultimate compressive strength of the polycrystalline ice is directly proportional to the temperature and also to the logarithm of strain rate. It is found that ductile brittle transition for the polycrystalline ice occurs at temperature -5℃ when the strain rate is 4.2×10 -4 s -1 .