摘要
以Mohr-Coulomb模型描述岩石,在LS-DYNA中用SPH(Smootheed Particle Hydrodynamics)法模拟三维刀齿切削破岩,探讨切削参数和岩石性质对切削力的影响.基于切削力随各切削参数和岩石性质的变化规律,建立切削力估算公式.用所得公式计算切削力,并与实验值进行比较.仿真结果表明:切削厚度、切削前角、切削宽度、岩石的内聚力和内摩擦角对切削力影响显著,切削速度在较低范围内变化时对切削力影响非常小.三维切削仿真能够较好地反映刀齿两侧岩石颗粒对切削的影响,比二维理论模型更接近实际.所得切削力估算公式能准确计算仿真中的平均切向力,且其计算值能与实验吻合较好.验证了基于SPH法的数值仿真用于研究刀齿切削破岩的可靠性.
The effects of cutting parameters and rock properties on cutting forces were studied through 3D simulation of rock cutting in the LS-DYNA with the Mohr-Coulomb model as rock material model and the SPH method.A formula to estimate cutting forces was created based on the relationships between cutting forces and cutting parameters,as well as rock properties drawn from the simulation results.The calculating results of the proposed formula were compared with the experiments.The simulation results show that cutting depth,rake angle,cutting width,cohesion and internal friction angle of rock have significant effects on cutting forces and that the variation of cutting speed have a small effect when the speed is slow.The interaction between the cutter tooth and rock particles beside it was taken into consideration in the 3D simulation of rock cutting.It made the simulation agree better with the experiments than the 2Dcutting model.The formula created in this paper can estimate the tangential cutting forces of the simulation with less errors and its calculating results agree well with the experimental results.The SPH method is proved to be a reliable method in rock cutting with cutter tooth.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2016年第1期84-90,共7页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(51179104)
关键词
SPH法
刀齿切削破岩
数值仿真
切削力
切削参数
smoothed particle hydrodynamics（SPH）method
rock cutting
numerical simulation
cutting force
cutting parameter
