Mohseni-Mofidi Shoya, Drescher Eric, Kruggel-Emden Harald, Teschner Matthias, Bierwisch Claas
Fraunhofer IWM, Wöhlerstraße 11, 79108 Freiburg, Germany.
Department of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany.
Materials (Basel). 2021 Dec 31;15(1):286. doi: 10.3390/ma15010286.
Solid particle erosion inevitably occurs if a gas-solid or liquid-solid mixture is in contact with a surface, e.g., in pneumatic conveyors. Having a good understanding of this complex phenomenon enables one to reduce the maintenance costs in several industrial applications by designing components that have longer lifetimes. In this paper, we propose a methodology to numerically investigate erosion behavior of ductile materials. We employ smoothed particle hydrodynamics that can easily deal with large deformations and fractures as a truly meshless method. In addition, a new contact model was developed in order to robustly handle contacts around sharp corners of the solid particles. The numerical predictions of erosion are compared with experiments for stainless steel AISI 304, showing that we are able to properly predict the erosion behavior as a function of impact angle. We present a powerful tool to conveniently study the effect of important parameters, such as solid particle shapes, which are not simple to study in experiments. Using the methodology, we study the effect of a solid particle shape and conclude that, in addition to angularity, aspect ratio also plays an important role by increasing the probability of the solid particles to rotate after impact. Finally, we are able to extend a widely used erosion model by a term that considers a solid particle shape.
如果气固或液固混合物与表面接触，例如在气力输送装置中，固体颗粒侵蚀就不可避免地会发生。深入了解这种复杂现象有助于通过设计使用寿命更长的部件来降低多种工业应用中的维护成本。在本文中，我们提出了一种对韧性材料的侵蚀行为进行数值研究的方法。我们采用能够轻松处理大变形和断裂的光滑粒子流体动力学方法，这是一种真正的无网格方法。此外，还开发了一种新的接触模型，以便稳健地处理固体颗粒尖角周围的接触问题。将侵蚀的数值预测结果与AISI 304不锈钢的实验结果进行了比较，结果表明我们能够正确预测侵蚀行为与冲击角的函数关系。我们提供了一个强大的工具，方便研究诸如固体颗粒形状等重要参数的影响，而这些参数在实验中并不容易研究。使用该方法，我们研究了固体颗粒形状的影响，并得出结论：除了棱角度外，纵横比也通过增加固体颗粒冲击后旋转的概率而发挥重要作用。最后，我们能够通过一个考虑固体颗粒形状的项来扩展一个广泛使用的侵蚀模型。
