The Cutting Mechanic Modeling And Experiment Research Of Metallic Glass Based On M-C Yield Criterion

Microstructure of the material determines its macroscopic properties. Metallic glass(amorphous alloy) with long-range disordered, short-range order atomic configuration and has many excellent physical and mechanical properties, and then has a wide range of potential applications in areas such as the aerospace and IT memory. Cutting machining is one of the important methods of material forming process, and cutting mechanical characteristics study is an important part of the cutting mechanism.According to the show metallic glass in material mechanics test of the tension compression asymmetry, and considering the pressure and temperature sensitivity of this kind of material, the Tresca yield criterion and Mises yield criterion that apply to describe the process of crystalline material yield can not well describe the cutting deformation of metallic glass yield process. This paper attempts to introduce the M-C yield criterion in the theoretical research of the mechanical properties of metallic glass cutting process, considering the impact of cutting temperature in the cutting force analytical model is established, and verified by the experiment. The experimental results better confirm the validity of theoretical modeling work. Specific studies are as follows:Based on the similarity of rock and soil structure and metallic glass atomic clusters structure, the M-C yield criterion that apply to the field of rock and soil mechanics is introduced into the deformation of metallic glass cutting yield. Considering the sensitive characteristics of the pressure and temperature of the metallic glass in shear deformation process, the M-C yield criterion has been amended, and then a new orthogonal cutting force analytical model has been established for describing metallic glass.In order to solve the above analytical model, after turning experiment the chip thickness and width have been measured, the shear angle and tool-chip friction angle in the analytic model also have been obtained by applying the minimum power theory. The thermodynamic analysis method that shear work converted into cutting temperature on the shear plane is used to solve the average temperature formula in cutting model.The use of cutting force measured data is compared to verify the above model. The experimental results show that, under the same cutting parameters, applicable to traditional amorphous metal cutting force model, does not consider cutting temperature rise the M-C criterion cutting force model, and M-C criterion cutting force model with considering the influence of cutting temperature rise, the latter has the highest accuracy. The maximum error between the theoretical model to calculate the value of cutting force and the measured value is 14.8%, the average error of 8.9%. The error between the traditional analytic model based on Tresca or Mises criterion and the cutting force test results is more than 59%. The experimental results fully demonstrate the validity of the theoretical modeling work.