盐水柱状模型冰弯曲强度数值计算分析

Numerical simulation analysis of flexural strength of columnar saline ice model

[目的]冰区航行船舶在平整冰层中破冰航行时,弯曲破坏是主要的破坏形式之一,因而对弯曲强度进行研究具有重要的工程实践意义。[方法]首先,采用离散元方法(DEM),利用CSSRC冰水池冰力学试验获得计算参数;然后,应用矩形单元对冰层进行离散,引用元胞数组控制力的传递对柱状模型冰的弯曲强度进行数值计算研究,并利用盐水柱状模型冰弯曲强度试验数据对计算结果进行校核,以确保数值计算模型的可靠性。[结果]通过该数值模型计算得到了弯曲强度随速度、宽厚比、长厚比改变的变化规律,由计算结果的误差分析得到了冰样弯曲强度的基本范围。[结论]所提方法可为模型冰力学特性的预报提供参考。

[Objective]As flexural failure is one of the main failure modes of ships navigating in level-ice region,research into flexural strength has great significance for engineering practices.[Methods]First,nu-merical prediction calculation is carried out for a model ice in a CSSRC(China Ship Scientific Research Cen-ter)ice tank;second,the discrete element method(DEM)is used to carry out the numerical simulation of the flexural strength of a columnar saline ice model,the calculation parameters are obtained through ice mechan-ics experiments,the rectangular element is used to discretize the ice layer,and cell array is used to transfer the control force.The calculation results are then verified using the flexural strength test data to ensure the reliabil-ity of the numerical simulation model.[Results]The variation law of flexural strength with velocity,ratio of width to thickness and ratio of length to thickness is obtained through the numerical model,and the basic scope of the flexural strength of the ice model is obtained through the error of the calculated results.[Conclusion]This numerical simulation method can provide references for predicting the mechanical prop-erties of ice models.