Smooth Particle Hydrodynamic (SPH) Modeling of Grinding the SiC-SiC Ceramic Matrix Composite

SiC-SiC 陶瓷基复合材料磨削的光滑颗粒流体动力学 (SPH) 建模

• 批准号: 426949379
• 负责人: Professor Dr.-Ing. Thomas Bergs
• 金额: --
• 依托单位: Werkzeugmaschinenlabor - WZL
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/426949379?language=en
• 关键词: Smooth; Particle; Hydrodynamic; SPH; Modeling

In this research project the material removal and damage mechanisms in grinding of the silicon carbide fiber reinforced silicon carbide (SiC-SiC) ceramic matrix composite (CMC) using the smoothed particle hydrodynamics (SPH) modeling are investigated. SiC-SiC has excellent high temperature material properties. Thus, SiC-SiC is an ideal material for aircraft engine and power generation turbine applications. Critical targets regarding dimensional accuracy and surface integrity of SiC-SiC are reached with help of the grinding process. However, the material removal and damage mechanisms in grinding of SiC-SiC are insufficiently known, so that a prediction of the process result is not yet possible. Therefore, costly preliminary tests must be carried out. Modeling of SiC-SiC grinding is important to gain a fundamental understanding of the material removal and damage mechanisms. The large negative rake angle of the cutting edges, random orientation and distribution of abrasive grains, large strain and high strain rates, deformation and fracture of the SiC fiber, the fiber-matrix interface and the matrix made modelling of the SiC-SiC grinding technically challenging. The SPH-method, a mesh-free Lagrangian method to address large local distortions and grain-workpiece interaction, will be used to overcome these barriers.

本文采用光滑粒子流体动力学（SPH）模型研究了碳化硅纤维增强碳化硅（SiC-SiC）陶瓷基复合材料（CMC）磨削过程中的材料去除和损伤机理。SiC-SiC具有优异的高温材料性能。因此，SiC-SiC是用于飞机发动机和发电涡轮机应用的理想材料。借助磨削工艺，实现了SiC-SiC尺寸精度和表面完整性的关键目标。然而，在SiC-SiC的研磨中的材料去除和损伤机制还不充分已知，使得还不可能预测工艺结果。因此，必须进行昂贵的初步试验。SiC-SiC磨削的建模对于获得对材料去除和损伤机制的基本理解是重要的。切削刃的大负前角、磨粒的随机取向和分布、大应变和高应变速率、SiC纤维的变形和断裂、纤维-基体界面和基体使得SiC-SiC磨削的建模在技术上具有挑战性。SPH方法是一种无网格拉格朗日方法，用于解决大的局部变形和颗粒-工件相互作用，将用于克服这些障碍。