Approach to computation of deformation friction force during chilled fish cutting

The approach to research of deformation friction forces during chilled fish cutting is proposed. The viscoelastic properties of chilled fish raw material are described by a three-element rheological model. The mathematical description of the knife rough surface profile in the form of a dimensionless periodic function with three harmonics has been used. The dimensionless contact pressures over the microprotrusions of the cutting body rough surface from the material has been analyzed. A mathematical model for computation the dimensional and dimensionless friction forces has been developed. It is shown that with an increase in the processing speed, the deformation component of the friction force tends to zero. Up to a certain sliding speed there is a full contact of the material with the irregularities of the edge. With an increase in elasticity and lengthening of the edge of the knife the considerated force increases monotonously. The dependence of the dimensionless width of the micro protrusions contact area with the material on elasticity is monotonic, and the dependence of the indicated dimensionless width on the dimensionless speed is nonmonotonic. With values of elasticity measure 5, dimensionless speed of 0.001; 0.03; and 0.12, maximum amplitude of contact pressure is 1.250; 1.973; and 3.635, respectively. With values of the elasticity measure 3; 5; 8; and 12, the minimum values of the dimensionless width of the contact pad are 0.615; 0.593; 0.575; and 0.563, respectively, the limit value is 0.679. With values of the elasticity measure 5; dimensionless length of the edge 10; 20; 30; and 50, values of the maximum deformation friction force are 9.345; 18.693; 28.040; and 46.724, respectively. With values of the dimensionless length of the edge 20; elasticity measures 2; 5; 8; and 12, values of maximum strength are 7.471; 18.693; 29.914; and 44.876, respectively.