Simulation of cutting processes using mesh-free Lagrangian particle methods
Simulation of cutting processes using mesh-free Lagrangian particle methods
复制标题
DOI：
10.1007/s00466-012-0720-z
复制
发表时间：
2013-03-01
影响因子：
4.1
通讯作者：
Gaugele, Timo
中科院分区：
文献类型：
--
作者：
Eberhard, Peter;Gaugele, Timo
本文提出了一种基于离散元法的“颗粒固体”模型，该模型用于模拟粘性和韧性材料（如铝）的切削过程。该模型是基于传统的三维离散元方法，采用刚性球，因为它是用来模拟粒状介质。除了基本模型的排斥相互作用之外，包括内聚相互作用允许颗粒团聚体显示内聚和延展行为。利用这样生成的粒状固体，可以定性和定量地再现铝等韧性工程材料的破坏模式。这是通过与拉伸和夏比冲击试验的实验进行比较而示出的。为了显示制造问题的方法的适用性，钢和铝的正交切削过程建模和切削力进行了比较实验。为了进一步增强模型的热粒子之间的相互作用。在切削过程中，由于耗散现象的热力学进行评估，并与实验进行比较。
This contribution presents the model of a 'granular solid' based on the Discrete Element Method which is used to model cutting processes of cohesive and ductile materials, e.g. aluminum. The model is based on a conventional three-dimensional Discrete Element approach which employs rigid spheres as it is used to model granular media. Including cohesive interactions besides the repulsive interactions of the basic model allows for the particle agglomerate to display cohesive and ductile behavior. Using the thus generated granular solid the failure modes of ductile engineering materials like aluminum can be qualitatively and quantitatively reproduced. This is shown by comparison with experiments of a tensile and a Charpy impact test. To show the applicability of the approach for manufacturing problems an orthogonal cutting process of steel and aluminum is modelled and the cutting forces are compared to experiments. To further enhance the model thermal interactions between particles are included. The thermodynamics during cutting due to dissipative phenomena is evaluated and compared to experiments.