Research On Quasi-static And Impact Damage Characteristics Of Frozen Ice

Engineering buildings in icy areas and ships sailing in polar regions will face interactions with sea ice.Such effects include quasi-static squeeze collision,shear damage,and dynamic impact collision problems,including the damage caused by instantaneous ice loads and the fatigue caused by periodic ice loads.In addition to the ice load response of ships and structures,the ice response under the action of ships and structures is also critical.In this paper,artificial frozen ice is used to conduct ice mechanics tests.The compression failure and tensile failure of frozen ice are studied by uniaxial compression test and disc splitting test respectively.The compressive strength and tensile strength of frozen ice are measured.The process of extrusion failure and tensile failure of frozen ice was classified,and the influence of size,temperature,loading rate and other factors on the mechanical properties of frozen ice was analyzed.A state-based peridynamic method is established,combined with Open MP parallel computing,and the icicle impact model is used to verify the accuracy of the numerical method.The parallel computing performance is analyzed,and the parallel computing under different modules and different particle numbers is accelerated.The ratio is analyzed to form the numerical calculation method of this article.After the formation of the numerical calculation method,the convergence verification was carried out for the numerical simulation working conditions.After verification,the numerical calculation method was used to study the quasi-static problem and the dynamic impact problem of frozen ice,and the splitting of the frozen ice disc was calculated.The process and the test force during the impact of icicles,the failure mode of frozen ice in the quasi-static and dynamic failure problems and the changes in crack propagation are analyzed,and the conclusion is drawn from the test results: the tensile and compressive strength of frozen ice is The geometric size has no obvious relationship;the compressive strength first increases and then decreases with the change of strain rate;the higher the temperature,the tensile and compressive strength of frozen ice decreases;the failure mode of frozen ice has four typical processes : Including 1)micro-crack formation,2)micro-crack growth,3)local damage,4)through cracks appearing,and four processes of overall failure.