Issue 37

U. Muhin et alii, Frattura ed Integrità Strutturale, 37 (2016) 318-324; DOI: 10.3221/IGF-ESIS.37.42 321 E XPERIMENTAL STUDY OF THE PROCESS OF BROADENING o test the developed model, an experiment was conducted in a laboratory mill (diameter work rolls 120 mm). We rolled lead samples without tension, after the front end of the sample from the roll gap dwell, the rolls were bred, and the sample removed for measurement. Conditions and results of the experiment are shown in Tabs. 1 - 3. N of exp. 0 h , mm 0 2 B , mm 1 h , mm 1 2 B , mm h  , mm B  2 ,mm äåôîðì  ,mm 1 10.1 30.1 8.15 31.4 1.95 1.3 15.0 2 10.0 15.4 7.8 16.8 2.2 1.4 16.0 Table 1 : Experimental conditions Distance from the inlet section, mm 0 3.0 6.0 9.0 12.0 15.0 )(2 xB , mm 30.1 30.45 30.8 31.1 31.3 31.4 Table 2 : Measuring the width of the sample in the deformation zone (experiment 1). Distance from the inlet section, mm 0 4.0 7.0 10.0 13.0 16.0 )(2 xB , mm 15.4 15.8 16.2 16.6 16.7 16.8 Table 3 : Measurer width of the sample in the deformation zone (experiment 2). The results of theoretical calculations of the experiments are presented in Tab. 4 and Figs. 2 and 3. N of exp. äåôîðì l , mm í x , mm t B  2 , mm B  2 , mm Exp.- theory Relative error,% 1 15.3 5.2 1.1 1.37 -0.07 -5.4 2 16.25 4.4 1.16 1.28 0.12 8.6 Table 4 : The results of theoretical calculations. Figure 2 : Comparison of the experimental and calculated data (a) Experiment 1; b) Experiment 2). In Fig. 2 a and b shows: a thin line – experiments data, and colon - the result of a theoretical calculation. To study the effect of tension on the broadening of the two cases were calculated by application alternating front and back tension. In both cases, the specific tension was assumed to be 20% of the yield strength in tension. At this point, you must cast the remark I.Ya.Tarnovskogo [1] on a constant value by varying the tension of the full value of broadening, only T