广义双剪粘弹塑性本构模型在渤海海冰动力学中的应用

Generalized Twin Shear Viscoelastic-plastic Constitutive Model with Application to Bohai Sea Ice Dynamics

在连续介质力学基础上建立了一个广义双剪粘弹塑性海冰动力学本构模型。该模型在海冰屈服前采用Kelvin-Vogit粘弹性模型,考虑中间主应力和静水压力对海冰屈服的影响选用广义双剪应力屈服准则作为海冰屈服判据,屈服后采用相关联的正则流动法则。采用该本构模型对渤海海冰动力过程进行了48小时数值模拟,讨论了辽东湾海冰的厚度、密集度、冰速和主应力的分布规律,其中海冰厚度分布与卫星遥感资料符合良好,从而有效地验证了该广义双剪粘弹塑性本构模型在海冰动力学中的可靠性。

A generalized twin shear viscoelastic-plastic constitutive model for sea ice dynamics is established based on continuum mechanics,where the Kelvin-Vogit viscoelastic pattern is adopted before ice yielding,and considering the effect of hydrostatic pressure and intermediate principal stress,the generalized twin shear stress yield criterion,and the associated normal flow rule are used during the plastic stage. In the sea ice dynamics simulation of Bohai Sea,the present constitutive model is applied to evaluate the distributions of ice thickness,concentration,velocity and stress. The simulated sea ice thickness is coincident with the satellite images,thus the reliability of this model was validated.