Stress-strain database of triaxial and uniaxial tests on lab-grown and field sea ice samples under various test conditions
Description
In this database, peak and residual stress and strain values along with their test conditions are collected from literature detailing field and laboratory-based sea ice compression experiments. These data are used to develop models of stress-strain relationships. For analysis, the peak stress is considered as the maximum stress value attained during the test, corresponding to the highest point on the stress-strain curve. The residual stress is quantified as the stress value at which the curve levels out following substantial deformation. This residual condition signifies a quasi-steady-state where stress remains relatively constant at a positive value with continued strain or drops abruptly indicating a secondary fracture. For specimens that exhibited abrupt failure, residual stresses were assumed to be zero for the purposes of analysis. These values were either directly reported or extracted manually from curves in published figures. Following assumptions should be considered while reviewing data: - The biaxial compression tests are assumed as triaxial. - Pure, fresh and distilled water samples are considered as freshwater. - “Field” refers to the specimens directly extracted from the natural sea and lake ice. - “Laboratory”, represents the specimens grown in a laboratory. - Frazil, granular, crushed, atmospheric ices are all assumed as polycrystalline. - Laboratory-grown freshwater and snow ice samples are categorized as “New”. - In reference to the average grain size reported in Table 3, it is typically specified for granular ice. However, for columnar ice, there is no standardized method for measuring and calculating the average grain size. In this study, the average column width was considered as a proxy for grain size. - Confinement ratio is the maximum value between σ2/σ1 and σ3/σ1 (σ1 is axial stress; σ2 and σ3 are lateral stresses). When the confinement is reported as a constant pressure (a constant stress in MPa, uniformly applied in lateral direction), this parameter is assumed as 0. - Specimen Preparation temperature assumed as test temperature, when it was not reported. This database should be used in conjunction with testing and conditions described in the paper titled "Data-Driven Modeling of Sea Ice Behavior Using Stress-Strain Database and Machine Learning".