Study of polycrystalline Al2O3 machining cracks using discrete element method
Study of polycrystalline Al2O3 machining cracks using discrete element method
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多晶Al2O3加工裂纹的离散元法研究
DOI：
10.1016/j.ijmachtools.2008.01.010
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发表时间：
2008-07
影响因子：
14
通讯作者：
Tan, Yuanqiang
中科院分区：
文献类型：
--
作者：
Sheng, Y.;Yang, Dongmin;Tan, Yuanqiang
采用离散元方法对多晶氧化铝脆性模型加工过程中的裂纹萌生和扩展进行了数值模拟。采用键合颗粒模型(BPM)进行离散元模拟，生成了与多晶氧化铝微观结构相似的颗粒组装体系。通过一系列数值试验对颗粒和平行结合特性进行了标定，并将其用于模拟多晶氧化铝的切割过程和划痕试验。发现裂纹是在加工工具的正下方或正前方产生的。在已加工表面上残留有许多微裂纹，其中一些向下扩展形成宏观裂纹，或向上扩展导致材料去除。DEM模拟和声发射测量实验都发现，当法向力和切向力突然变化时，断裂变得尖锐，导致裂纹数量增加。在三维DEM划痕模拟中，表面裂纹长度和次表面裂纹深度随划痕深度线性增加，数值与实验结果吻合较好，表面损伤宽度随深度的增加而逐渐减小，呈半个硬币状。
Discrete element method (DEM) was introduced to simulate crack initiation and propagation of polycrystalline alumina during the brittle model machining process. A bonded particle model (BPM) was employed in the DEM simulations procedure to generate a particle assembly system similar to the micro-structure of the polycrystalline alumina. Particle and parallel bond properties, which were calibrated through a series of numerical tests, were subsequently used in the simulations of polycrystalline alumina cutting process and scratching tests. It is found that the cracks initiated right under or in front of the machining tool. There were many micro-cracks remained on the machined surface, some of them propagated downwards to form macro-cracks or forwards to lead material removal. Both DEM simulations and acoustic emission measure experiments have found that the fracture became acute when the normal and the tangential force changed suddenly, causing the crack number to increase. In 3D DEM scratching simulation, the surface cracks length and subsurface cracks depth linearly increased with the scratching depth, the value agreed well with the experimental results, and the surface-damage width decreased gradually with the depth to the surface, looking like half of a coin.
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