RMZ â MATERIALI IN GEOOKOLJE

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( ) (( ))[1 + 2(( )) (( ))] ln(1 + (( )) 2(( )))( ) = ln( (( )))(( ))] ln(1 + (( )) 2(( )))340 Kugler, G., Terčelj, M., Peruš, I., Turk, R.for force and l is elongation. From F = ing area of the rod. Since some plasticdeformation occurs always also = (( )))σS, it follows that outside of the working area, this contributesto error. Namely, the slope = = 1 + = of the contour at boundary between(17) outside and inside area is very high. = Therefore the calculated lengths ofrods at initial steps of deformationwhere the constancy of the volume has are too long, and cross-sections arebeen taken into account. Therefore the even smaller than those obtainedforce is maximal when dσ/dε = σ. at the end of deformation. Movingalong the deformed contour resultsFormation of contours during in shortening of calculated lengthstrainingas well as in increasing the minimalcross-section. According to theThe key parameters that for the selectedfunctional model determine how present model the length of the rodaccurate the shape of contour can be initially increases with strain, whichdetermined are the volume V o, which is nonsense. To avoid this inconsistencythe contour was calculated withundergo plastic deformation, and thelocal slopes of the final contour. Of our model only after the calculatedcourse, the last condition is not valid length begins to increase with strain,for the simplest i.e. cylindrical model, before that the contour was calculatedassuming homogeneous defor-since the boundary conditions (7) and(8) cannot be fulfilled. Consequently, mation. The examples of calculationthe shapes of contours calculated by of the rod shapes evolution duringcylindrical model are unrealistic (see deformation for cylinder and for catenaryat temperatures 1000 °C andFigures. 5a and c), but nevertheless, asit will be demonstrated later, this modelgives surprisingly good prediction 0.1 s –1 are shown on Figure 5. If one900 °C, and prescribed strain rate ofof the evolution of the minimal radius wants to calculate the dependenceof the rod within the neck during entire of true stress on strain, the minimaltensile test.cross-section, which is obtained fromreconstruction of contour of the rod,As we mentioned earlier the volume, must be given for every strain. TheV o, is obtained by integration of the dependence of minimal radius onfinal contour of the rod along the z- elongation for two temperatures calculatedby catenary model is givenaxis considering condition r(z) ≤ r o,where r ois initial radius of the work-on Figures 6a and 6b.<strong>RMZ</strong>-M&G 2012, 59
Calculation of stress-strain dependence from tensile tests at high temperatures using ...341Figure 4. Technical curves force-elongation obtained wit tensile tests for strain ratesof (0.001, 0.01 and 0.1) s –1 at temperatures of 800 °C (a), 900 °C (b), and 1000 °C (c)together with corresponding measured final shapes of deformed rods (d)–(f).Figure 5. The calculated shapes of tensile rods for various stages of deformations attemperature of 1000 °C and strain rate of 0.1 s –1 for cylindrical (a) and for catenarymodel (b). Calculation for cylindrical (c) and catenary (d) models at T = 900 °C andstrain rate of 0.1 s –1 .<strong>RMZ</strong>-M&G 2012, 59
Page 4 and 5: IVTable of Contents - KazaloProfess
Page 7 and 8: Calculation of stress-strain depend
Page 11 and 12: () = (, )() () ()Calculation
Page 13: , ) (, )(, ) 1 () + = (, ) =
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Page 23 and 24: Petrochemical characteristics and g
Page 34 and 35: 360 Akinola, O. O., Talabi, A. O.A
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Page 38 and 39: 364 Sunmonu, L. A., Adagunodo, T. A
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390 Sunmonu, L. A., Adagunodo, T. A
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392 Shemetov, P. A., Bibik, I. P.in
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394 Shemetov, P. A., Bibik, I. P.
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k =1.05+Dλ = 1+k =( s )396 Shemeto
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398 Shemetov, P. A., Bibik, I. P.si
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у 3 b400 D = f eShemetov, P. A., B
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V4BEK Q σBEad = ,commQрσV 01 +
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404 Shemetov, P. A., Bibik, I. P.wh
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thrмR iλ = 2 λ= 100⋅exp[ −(
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qLevel of average technical (theore
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.6670.05=0.35k1,05+D avet( s3≥ Kt
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RMZ-M&G 2012, 59
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414 Adewale, A., Olawale, O. O., Ma
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430 Kos, A., Dervarič, E.novega ve
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432 Kos, A., Dervarič, E.diamond w
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434 Kos, A., Dervarič, E.chines to
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436 Kos, A., Dervarič, E.the best
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438 Kos, A., Dervarič, E.Before th
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440 Kos, A., Dervarič, E.nally to
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444 Lajovic, A.disc brakes, further
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446 Lajovic, A.Slika 2. Izrez iz Si
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448 Lajovic, A.Livne lonce smo na n
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450 Lajovic, A.Ingersol pa je bil z
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452 Lajovic, A.Med delavci, ki so b
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454 Lajovic, A.imel vsak delavec na
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456 Lajovic, A.Slika 5. Izdelki Že
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458 Lajovic, A.pa se ni najbolje iz
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460 Lajovic, A.za delo. Promet na z
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462 Lajovic, A.Sredi osemdesetih le
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464 Lajovic, A.njem delu forme. Na
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466 Lajovic, A.Enourni film je mars
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470 Medved, J., Rosina, A., Vončin
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472 Author’s IndexAuthor`s Index,
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RMZ-M&G 2012, 59
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Contents476Phase contrast method fo
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Contents47859/4Calculation of stres
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Instructions to authors481Compositi
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Instructions to authors483NAVODILA
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Instructions to authors485Knjige:Ro
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Template487TEMPLATEThe title of the
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Template489References (Times New Ro
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Template491Obstajata dve sprejemlji
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