华中科技大学学报（自然科学版）2024，Vol.52Issue(10)：85-91,7.DOI:10.13245/j.hust.240526
松花江淡水单晶冰的韧脆转换和破坏机理研究
Study on ductile-brittle transition and failure mechanism of freshwater single-crystal ice in Songhua River
摘要
Abstract
To clearly exploring the mechanical property of single-crystal ice,single-crystal ice of Songhua River was prepared.The full-field deformation during a uniaxial compression test was measured by 3D digital image correlation(3D DIC)method.At the submillimeter scale,the ductile-brittle transition mechanism and failure mode were studied based on basal slip.The ductile-brittle transition range of Songhua River ice is determined to be 3.0×10-4～2.0×10-3 s-1.The failure mode and compressive strength show the characteristics of ductile-brittle transition.Splitting failure occurs in this range,and the compressive strength reaches the maximum value.When the strain rate is lower than 3.0×10-4 s-1,the basal slip releases most stress inhomogeneity and develops into a fracture surface,resulting in ductile failure mode.when the strain rate is higher than 2.0×10-3 s-1,and the basal slip has little effect on the crack direction.The ice exhibites splitting failure.The equivalent elastic modulus is positively correlated with the strain-rate.The strain softening phenomenon occurs after the ice specimen reaches the stress peak value.The gradient and peak value of the stress reduction rate increases with the increase of the strain rate.关键词
冰力学/单轴压缩试验/单晶冰/破坏模式/抗压强度/数字图像相关法Key words
ice mechanics/uniaxial compression test/single-crystal ice/failure mode/compressive strength/digital image correlation method分类
数理科学引用本文复制引用
王春阳,王庆,景重阳,韩端锋..松花江淡水单晶冰的韧脆转换和破坏机理研究[J].华中科技大学学报（自然科学版）,2024,52(10):85-91,7.基金项目
国家自然科学基金资助项目(52192690,52192695). （52192690,52192695）
