Issue 37

U. Muhin et alii, Frattura ed Integrità Strutturale, 37 (2016) 318-324; DOI: 10.3221/IGF-ESIS.37.42 322 then can the correct application of the Jordan’s principle. The results of calculation are shown in Figs. 3a and 3b. Figure 3 : Effect of the anterior and posterior tension on broadening (the conditions of experiment 1, b) the conditions of experiment 2). Thick line corresponds to the distribution of outbreak strain broadening without tension, dashed - by applying only the front tension, fine - just by applying back tension. Theoretical calculation of the behavior of the side edges of the deformation zone by applying tension corresponds to practical results. For example, the independence of the broadening of the front tension V.N.Vydrina noted in [4] and V.P.Kalinina [5]. T HE UNEVEN DISTRIBUTION OF STRESSES ON THE SPECIFIC BANDWIDTH AND BROADENING e now turn to the Eq. (3) - it consists of different signs - power front tension, and - power adjustable tension. According to this equation, the value of broadening for the combination of thickness and tension when these power offset each other, must be equal to the broadening of the rolling without tension. However, numerous experimental studies have shown that the value of broadening the rolling with front and rear tension less than the rolling without tension. The question arises of how these facts are consistent with the energy balance equation. It can be assumed that the application is the cause of tension in the Eq. (3) additional capacity of the forces acting on the inlet and outlet sections of the deformation zone. To test this hypothesis using the software package NISA/DISPLAY firm EMRC (USA) finite element stress fields were built in the plate, one side of which is fixed on the movement, and the other is uniformly loaded with tensile stress. Entrenchment simulates the output section of the deformation zone. The stress field for the case of uniformly distributed applications tension within the bandwidth of the deformation zone is shown in Fig. 4. It can be seen that the distribution of the tensile stress at the exit of the deformation zone has a pronounced unevenness, which generally can be described as a function. )( y x    . This non-uniformity due to the appearance of power, called the power consumed bandwidth on the accumulation of potential energy [6,7], which is bringing a band of the deformation zone. Its value is calculated as follows:   B x s ïîò dy E hv N 0 2 11 2   . (7) This power should appear in Eq. (3), together with the power of the front tension. In addition, tension band to which a tension, characterized by compressive stresses in the direction perpendicular to the rolling direction, which also influence the decrease of the broadening of the band at rolling with tension. Similar reasoning applies to the back tension. Changing the amount of force bending of the work rolls promotes redistribution of specific tension in width rolled strip. This changes the balance of power, and, therefore, changes the value of broadening (Fig. 5). W