scholarly journals Determination of transformation plasticity coefficient of steel by horizontal quenching of shaft

2020 ◽  
Vol 50 ◽  
pp. 498-502
Author(s):  
Keisuke Watanabe ◽  
Mayu Yamada ◽  
Morihiko Nakasaki ◽  
Ryo Matsumoto ◽  
Hiroshi Utsunomiya
Keyword(s):  
Transformation Plasticity ◽  
Plasticity Coefficient

scholarly journals TO DETERMINATION OF THE CRACKING MOMENT FOR BENDING REINFORCED CONCRETE ELEMENTS WITH ACCOUNT OF PLASTIC DEFORMATIONS OF CONCRETE IN THE TENSION AREA

2018 ◽  
Vol 3 (3) ◽  
pp. 30-38
Author(s):  
О.В. Радайкин ◽  
Oleg Radaykin
Keyword(s):  
Reinforced Concrete ◽  
Deformation Model ◽  
Conventional Concrete ◽  
Class A ◽  
Standard Calculation ◽  
Plasticity Coefficient ◽  
Concrete Elements ◽  
Nonlinear Deformation Model ◽  
Good Agreement

At the standard calculation of the cracking moment for bending reinforced concrete elements the plasticity coefficient γ is normally used, which according to SP 63.13330.2012 is 35% less than in the old SNiP 2.03.01-84*. The question arises, what is the reason for such a noticeable difference and which of the methods gives more reliable results? This article seeks to answer this question. For this purpose the physical meaning of the coefficient γ was considered in detail, with the usage of a nonlinear deformation model of a normal section. A calculation formula for γ depending on an element’s reinforcement degree was obtained, which is valid for conventional concrete of B15-B35 class. A comparison of the calculated cracking moment according to the proposed method with experiments by the other authors was carried out. A good agreement of results was observed.

scholarly journals Determination of Coefficient for Transformation Plasticity in Terms of Three-Point Bending System

2005 ◽  
Vol 48 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Kenichi OSHITA ◽  
Shigeru NAGAKI ◽  
Shinichi ASAOKA ◽  
Katsuyuki MOROZUMI
Keyword(s):  
Transformation Plasticity ◽  
Three Point Bending

scholarly journals Determination of Coefficient for Transformation Plasticity in Terms of Three Point Bending System

2003 ◽  
Vol 69 (684) ◽  
pp. 1230-1235 ◽  
Author(s):  
Shigeru NAGAKI ◽  
Shinichi ASAOKA ◽  
Katsuyuki MOROZUMI ◽  
Kenichi OHSHITA
Keyword(s):  
Transformation Plasticity ◽  
Three Point Bending

Experimental Investigation of Transformation Plastic Behavior under Tensile-Compressive-Torsional Stress in Steel

2014 ◽  
Vol 626 ◽  
pp. 426-431 ◽  
Author(s):  
Naoki Hikida ◽  
Yuta Yamamoto ◽  
Kenichi Oshita ◽  
Shigeru Nagaki
Keyword(s):  
Hydrostatic Pressure ◽  
Testing System ◽  
Plastic Behavior ◽  
Test Results ◽  
Transformation Plasticity ◽  
Biaxial Testing ◽  
Torsional Strain ◽  
Pearlitic Transformation ◽  
Dependent Model ◽  
Plasticity Coefficient

A tensile/compressive-torsional biaxial testing system was employed and tensile/ compressive-torsional tests were performed for the hollow specimen, which was loaded and the austenized specimen was cooled so that pealrite transformation accompanied by transformation plasticity occurred and axial and torsional strain were measured. Furthermore, the elastic-plastic constitutive equation due to phase transformation based on the hydrostatic pressure dependent model was proposed, and the validity of this equation was discussed experimentally. The test results showed the transformation plasticity coefficient due to pearlitic transformation of S45C depends on the loading direction, and these behaviour can be appropriately expressed by the hydrostatic pressure dependent model than the isotropic model.

Experimental Study on Transformation Plasticity in Terms of Three-Point Bending System

2014 ◽  
Vol 626 ◽  
pp. 408-413 ◽  
Author(s):  
M. Arif Hamdam ◽  
Shigeru Nagaki ◽  
Kenichi Oshita
Keyword(s):  
Phase Transformation ◽  
Martensite Phase ◽  
The Other ◽  
Maximum Deflection ◽  
Transformation Plasticity ◽  
Three Point Bending ◽  
Bending Stresses ◽  
Simple Support ◽  
Plasticity Coefficient ◽  
Forced Cooling

Three-point bending system with one end simple support and the other end fix support has been proposed to analyze the transformation plasticity (TP) behavior and obtain transformation plasticity coefficient. In this investigation two types of materials SCM440 steel and S45C steel have been studied. The specimens were heated to austenite temperature and the temperature kept constant for several minutes, then cooling and loading processes were performed. Austenite to martensite phase transformation with forced cooling for SCM440 steel and austenite to pearlite phase transformation with natural cooling for S45C steel due to bending stresses have been occurred. The deflections of specimen were measured during loading process. By obtaining the maximum deflection due to transformation plasticity, the transformation plasticity coefficient was determined.

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).

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