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Modelling of ice rubble in the punch shear tests with cohesive 3D discrete element method

机译：粘性3D离散元方法在冲切试验中碎冰建模

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Purpose This paper aims to simulate a punch shear test of partly consolidated ice ridge keel by using a three-dimensional discrete element method. The authors model the contact forces between discrete ice blocks with Hertz-Mindlin contact model. For freeze bonds between the ice blocks, the authors apply classical linear cohesion model with few modifications. Based on punch shear test simulations, the authors are able to determine the main characteristics of an ice ridge from the material parameters of the ice and freeze bonds. Design/methodology/approach The authors introduced a discrete model for ice that can be used for modelling of ice ridges. The authors started with short introduction to current status with ice ridge modelling. Then they introduced the model, which comprises Hertz-Mindlin contact model and freeze bond model with linear cohesion and softening. Finally, the authors presented the numerical results obtained using EDEM is commercial Discrete Element Modeling software (EDEM) and analysed the results. Findings The Hertz-Mindlin model with cohesive freeze bonds and linear softening is a reasonable model for ice rubble. It is trivial that the ice blocks within the ice ridge are not spherical particles, but according to results, the representation of ice blocks as spheres gave promising results. The simulation results provide information on how the properties of freeze bond affect the results of punch shear test. Thus, the simulation results can be used to approximate the freeze bonds properties within an ice ridge when experimental data are available.
机译：目的本文旨在通过三维离散元方法模拟部分固结的冰脊龙骨的冲切试验。作者使用Hertz-Mindlin接触模型来模拟离散冰块之间的接触力。对于冰块之间的冻结键，作者采用了很少修改的经典线性内聚模型。基于冲剪试验模拟，作者能够根据冰和冻结键的材料参数确定冰脊的主要特征。设计/方法/方法作者介绍了一种可用于冰块建模的离散冰模型。作者首先简要介绍了冰岭建模的当前状态。然后，他们介绍了该模型，该模型包括具有线性内聚和软化作用的Hertz-Mindlin接触模型和冻结键模型。最后，作者介绍了使用EDEM（商业离散元素建模软件，EDEM）获得的数值结果，并对结果进行了分析。研究结果具有凝聚力的冻结键和线性软化作用的Hertz-Mindlin模型是适用于冰瓦砾的合理模型。冰脊内的冰块不是球形颗粒是不重要的，但是根据结果，将冰块表示为球形会产生令人鼓舞的结果。仿真结果提供了有关冻结粘结特性如何影响冲剪测试结果的信息。因此，当可获得实验数据时，仿真结果可用于近似冰脊内的冻结键属性。

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