Estimation of Temperature Conductivity Coefficient Impact upon Fatigue Damage of Material

6th International Scientific Practical Conference on Innovative Technologies and Economics in Engineering

工业技术;经济学

Bibik, V.^1 ; Galeeva, A.^1

Yurga Institute of Technology, TPU Affiliate, Leningradskaya street 26, Yurga

65205, United States^1

关键词: Cemented carbide tools;    Cutting temperature;    Damage of materials;    Density of dislocation;    Dislocations densities;    Estimation of temperatures;    Temperature conductivity;    Thermal conduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/91/1/012033/pdf
DOI  :  10.1088/1757-899X/91/1/012033

学科分类：工业工程学

来源: IOP

【 摘 要 】

In the paper we consider the peculiarities of adhesive wear of cutting tools. Simulation of heat flows in the cutting zone showed that, as thermal conduction and heat conductivity of tool material grow, the heat flows from the front and back surfaces to tool holder will increase and so, the temperature of the contact areas of the tool will lower. When estimating the adhesive wear rate of cemented-carbide tool under the cutting rates corresponding to the cutting temperature of up to 900 °C, it is necessary to take the fatigue character of adhesive wear into consideration. The process of accumulation and development of fatigue damage is associated with micro- and macroplastic flowing of material, which is determined by the processes of initiation, motion, generation, and elimination of line defects - dislocations. Density of dislocations grows with increase of the loading cycles amount and increase of load amplitude. Growth of dislocations density leads to loosening of material, formation of micro- and macrocracks. The heat capacity of material grows as the loosening continues. In the given paper the authors prove theoretically that temperature conductivity coefficient which is associated with heat capacity of material, decreases as fatigue wear grows.