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.

本研究采用光滑粒子流体力学(SPH)模型研究了碳化硅纤维增强碳化硅陶瓷基复合材料(CMC)磨削过程中的材料去除和损伤机理。碳化硅-碳化硅具有优异的高温材料性能。因此，碳化硅是航空发动机和发电涡轮应用的理想材料。借助磨削工艺，达到了碳化硅-碳化硅的尺寸精度和表面完整性的关键指标。然而，对碳化硅-碳化硅磨削过程中的材料去除和损伤机理还不够清楚，因此还不可能对加工结果进行预测。因此，必须进行代价高昂的初步测试。建立了碳化硅-碳化硅磨削过程的数学模型，对于从根本上理解材料的去除和损伤机理具有重要意义。刀具刃口的大负前角、磨粒的随机取向和分布、大应变和高应变率、碳化硅纤维的变形和断裂、纤维-基体界面和基体的存在使碳化硅-碳化硅磨削的建模在技术上具有挑战性。SPH方法是一种无网格的拉格朗日方法，用于处理大的局部变形和颗粒-工件相互作用，将被用来克服这些障碍。