Determination of forward slip in H-beam rolling

1995 ◽  
Vol 54 (1-4) ◽  
pp. 114-119 ◽  
Author(s):  
Wenzhi Zhang ◽  
Chunqing Zhu ◽  
G.E.O. Widera
Keyword(s):  
Forward Slip ◽  
H Beam

Determination of Contact Pressure during Double-T Section Rolling in Universal Beam Groove

2020 ◽  
Vol 299 ◽  
pp. 546-551
Author(s):  
Danil L. Shvarts ◽  
Sergey O. Nepriakhin
Keyword(s):  
Equations Of State ◽  
Rolling Force ◽  
Theoretical Method ◽  
Stress And Strain ◽  
Calculation Error ◽  
State Of Stress ◽  
H Beam ◽  
Section Rolling ◽  
Contact Pressures

Based on application the physical constraint equations of state of stress and strain of the metal for the isotropic medium, we get expressions for components of stress tensor. The new theoretical method for calculation of contact pressures and rolling force during rolling of double-T section in a universal beam groove was developed. Reliability of the method is confirmed by the results of experimental verification for conditions of rolling of H-beam No 35B1, 40K2 and 45B2 from steel 15CrSiNiCu on the universal beam mill of "NTMK". The average calculation error is 6.4%. The new method is recommended for calculation pass design and technological modes of H-beam rolling on rail-beam and section mills, equipped with universal stands.

Calculation of temperature and determination of deformation resistance in H-beam rolling

1999 ◽  
Vol 94 (2-3) ◽  
pp. 123-127 ◽  
Author(s):  
Wenzhi Zhang ◽  
Qingtian Zhou ◽  
Chunqing Zhu ◽  
G.E.O Widera
Keyword(s):  
Deformation Resistance ◽  
H Beam

Calculation of temperature and determination of deformation resistance in H-beam rolling

1999 ◽  
Vol 94 (2-3) ◽  
pp. 128-132
Author(s):  
Wenzhi Zhang ◽  
Qingtian Zhou ◽  
Chunqing Zhu ◽  
G.E.O. Widera
Keyword(s):  
Deformation Resistance ◽  
H Beam

Mechanics of the H-Beam Rolling in the Universal Beam Groove

2020 ◽  
Vol 989 ◽  
pp. 622-628
Author(s):  
Danil L. Shvarts ◽  
Sergey O. Nepriakhin
Keyword(s):  
Variational Principle ◽  
Statistical Error ◽  
Geometrical Model ◽  
Total Power ◽  
Forward Slip ◽  
Slip Coefficient ◽  
Load Calculation ◽  
The Mean ◽  
H Beam ◽  
Section Rolling

The formulation and solution of the problem of double-T section rolling in universal groove using the variational principle of minimum total power with aim to determine integral forming and energy-power parameters are presented. Geometrical model of the deformation zone and the kinematically admissible velocity field were constructed accurate within two unknowns: forward slip coefficient ν, flange spread (pulling-down) . The comparison of the calculated values with the experimental data obtained on a laboratory mill 200 confirmed that the variational principle of minimum total power has sufficient accuracy for analysis of double-T section rolling in universal groove. The mean statistical error of torque calculation is 12.3 % while load calculation is 18.7 %.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Sign in / Sign up

Export Citation Format

Share Document