氧化铝陶瓷生坯切削加工裂纹的离散元仿真研究
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摘要
利用离散元软件PFC2D建立了氧化铝陶瓷生坯的二维离散元模型,并通过力学性能数字模拟试验对该模型进行校准,使其物理和力学性能参数与氧化铝陶瓷生坯的实际参数相匹配。基于该模型对氧化铝陶瓷生坯切削加工进行了动态模拟,分析了低速切削时,切削速度和切削深度对切削力及加工后表面裂纹的影响。结果表明:用离散元的方法模拟陶瓷生坯材料的切削过程可行,加工后表面裂纹的数目及平均深度随切削深度的增大而增大,并随切削速度的增大而减小。
A two-dimensional discrete element model of the green Al_2O_3 ceramics is established by using discrete element software PFC2 D.The model is calibrated by numerical simulation of mechanical properties.Its physical and mechanical properties are matched with the actual parameters of the green Al_2O_3 ceramics.Based on the model,the cutting process of green Al_2O_3 ceramics is simulated dynamically,and the effects of different cutting speeds and cutting depths on cutting force and surface cracks after machining are analyzed.The results show that it is feasible to simulate the cutting process of green ceramics by discrete element method.The number and average depth of surface cracks after machining increase with the increasing of cutting depth,while decrease with the increasing of cutting speed.
A two-dimensional discrete element model of the green Al_2O_3 ceramics is established by using discrete element software PFC2 D.The model is calibrated by numerical simulation of mechanical properties.Its physical and mechanical properties are matched with the actual parameters of the green Al_2O_3 ceramics.Based on the model,the cutting process of green Al_2O_3 ceramics is simulated dynamically,and the effects of different cutting speeds and cutting depths on cutting force and surface cracks after machining are analyzed.The results show that it is feasible to simulate the cutting process of green ceramics by discrete element method.The number and average depth of surface cracks after machining increase with the increasing of cutting depth,while decrease with the increasing of cutting speed.
引文
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[3]叶勇,徐西鹏.岩石类脆性材料的离散元建模方法研究[J].郑州轻工业学院学报,2008,23(5):62-66.
[4]叶勇,徐西鹏.岩石切削加工动态行为的离散元模拟[J].工具技术,2008,42(6):26-29.
[5]谭援强,杨冬民,李才,等.单晶硅加工裂纹的离散元仿真研究[J].中国机械工程,2008(21):2545-2548.
[6]Tan Y Q.Study of polycrystalline Al2O3 machining cracks using discrete element method[J].International Journal of Machine Tools and Manufacture,2008,48(9):975-982.
[7]Cundall P A,Strack O D L.A discrete numerical model for granular assemblies[J].Gpotechnique,1979,29(1):47-65.
[8]Sheng Y,Lawrebce C J,Briscoe B J,et al.Numerical studiesof uniaxial powder compaction process by 3D DEM[J].Engineering Computations,2004,21(2-4):304-317.
[9]Liu Y Y,Deng J X,Wu F F,et al.Wear resistance of carbide tools with textured flank-faced in dry cutting of green alumina ceramics[J].Wear,2017,372(3):91-103.
[10]Reed J S.Principles of Ceramics Processing[M].New York:John Wiley & Sons,1995.