De-icing technology has become an increasingly important subject in numerous applications in recent years.However,the direct numerical modeling and simulation the physical process of thermomechanical deicing is limite...De-icing technology has become an increasingly important subject in numerous applications in recent years.However,the direct numerical modeling and simulation the physical process of thermomechanical deicing is limited.This work is focusing on developing a numerical model and tool to direct simulate the de-icing process in the framework of the coupled thermo-mechanical peridynamics theory.Here,we adopted the fully coupled thermo-mechanical bond-based peridynamics(TM-BB-PD)method for modeling and simulation of de-icing.Within the framework of TM-BB-PD,the ice constitutive model is established by considering the influence of the temperature difference between two material points,and a modified failure criteria is proposed,which takes into account temperature effect to predict the damage of quasi-brittle ice material.Moreover,thermal boundary condition is used to simulate the thermal load in the de-icing process.By comparing with the experimental results and the previous reported finite element modeling,our numerical model shows good agreement with the previous predictions.Based on the numerical results,we find that the developed method can not only predict crack initiation and propagation in the ice,but also predict the temperature distribution and heat conduction during the de-icing process.Furthermore,the influence of the temperature for the ice crack growth pattern is discussed accordingly.In conclusion,the coupled thermal-mechanical peridynamics formulation with modified failure criterion is capable of providing a modeling tool for engineering applications of de-icing technology.展开更多
Due to complex mesoscopic and the distinct macroscopic evolution characteristics of ice,especially for its brittle-to-ductile transition in dynamic response,it is still a challenging task to build an accurate ice cons...Due to complex mesoscopic and the distinct macroscopic evolution characteristics of ice,especially for its brittle-to-ductile transition in dynamic response,it is still a challenging task to build an accurate ice constitutive model to predict ice loads during ship-ice collision.To address this,we incorporate the conventional multi-yield-surface plasticity model with the state-based peridynamics to simulate the stress and crack formation of ice under impact.Additionally,we take into account of the effects of inhomogeneous temperature distribution,strain rate,and pressure sensitivity.By doing so,we can successfully predict material failure of isotropic freshwater ice,iceberg ice,and columnar saline ice.Particularly,the proposed ice constitutive model is validated through several benchmark tests,and proved its applicability to model ice fragmentation under impacts,including drop tower tests and ballistic problems.Our results show that the proposed approach provides good computational performance to simulate ship-ice collision.展开更多
基金the University of California at Berkeley.Ms.Y.Song gratefully acknowledges the financial support from the Chinese Scholar Council(CSC Grant No.201706680094).
文摘De-icing technology has become an increasingly important subject in numerous applications in recent years.However,the direct numerical modeling and simulation the physical process of thermomechanical deicing is limited.This work is focusing on developing a numerical model and tool to direct simulate the de-icing process in the framework of the coupled thermo-mechanical peridynamics theory.Here,we adopted the fully coupled thermo-mechanical bond-based peridynamics(TM-BB-PD)method for modeling and simulation of de-icing.Within the framework of TM-BB-PD,the ice constitutive model is established by considering the influence of the temperature difference between two material points,and a modified failure criteria is proposed,which takes into account temperature effect to predict the damage of quasi-brittle ice material.Moreover,thermal boundary condition is used to simulate the thermal load in the de-icing process.By comparing with the experimental results and the previous reported finite element modeling,our numerical model shows good agreement with the previous predictions.Based on the numerical results,we find that the developed method can not only predict crack initiation and propagation in the ice,but also predict the temperature distribution and heat conduction during the de-icing process.Furthermore,the influence of the temperature for the ice crack growth pattern is discussed accordingly.In conclusion,the coupled thermal-mechanical peridynamics formulation with modified failure criterion is capable of providing a modeling tool for engineering applications of de-icing technology.
文摘Due to complex mesoscopic and the distinct macroscopic evolution characteristics of ice,especially for its brittle-to-ductile transition in dynamic response,it is still a challenging task to build an accurate ice constitutive model to predict ice loads during ship-ice collision.To address this,we incorporate the conventional multi-yield-surface plasticity model with the state-based peridynamics to simulate the stress and crack formation of ice under impact.Additionally,we take into account of the effects of inhomogeneous temperature distribution,strain rate,and pressure sensitivity.By doing so,we can successfully predict material failure of isotropic freshwater ice,iceberg ice,and columnar saline ice.Particularly,the proposed ice constitutive model is validated through several benchmark tests,and proved its applicability to model ice fragmentation under impacts,including drop tower tests and ballistic problems.Our results show that the proposed approach provides good computational performance to simulate ship-ice collision.
