Effect of mechanical load and thickness profile on creep in a rotating disc by using Seth’s transition theory

2017 ◽  
Author(s):  
Pankaj Thakur ◽  
Shivdev Shahi ◽  
Nishi Gupta ◽  
S. B. Singh
Keyword(s):  
Mechanical Load ◽  
Transition Theory ◽  
Rotating Disc ◽  
Thickness Profile

scholarly journals Exact Solution for Functionally Graded Variable-Thickness Rotating Disc with Heat Source

2010 ◽  
Vol 224 (11) ◽  
pp. 2316-2331 ◽  
Author(s):  
M Bayat ◽  
A H Mohazzab ◽  
B B Sahari ◽  
M Saleem
Keyword(s):  
Heat Source ◽  
Variable Thickness ◽  
Thermal Load ◽  
Radial Stress ◽  
Mechanical Load ◽  
Functionally Graded ◽  
Displacement Fields ◽  
Rotating Disc ◽  
Thickness Profile ◽  
Stress And Displacement Fields

Exact elastic solutions for axisymmetric variable-thickness hollow rotating discs with heat source made of functionally graded (FG) materials under free—free and fixed—free boundary conditions are presented. Material properties and disc thickness profiles are assumed to be represented by specified power law distributions. The effect of the heat source and the geometry of the disc on stress and displacement fields are investigated. It is found that the location of maximum radial stress owing to thermal load does not tend towards the outer surface like radial stress owing to mechanical load for free—free FG discs with an increase in parameter m related to the thickness profile. The temperature distribution in a disc with hyperbolic thickness profile is the smallest compared with other thickness profiles. The FG disc with hyperbolic convergent thickness profile has smaller stresses because of thermal load compared with the disc with uniform thickness profile.

Thermal creep transition stresses and strain rates in a circular disc with shaft having variable density

2016 ◽  
Vol 33 (3) ◽  
Author(s):  
Dr Pankaj Thakur ◽  
Jatinder Kaur ◽  
Satya Bir Singh
Keyword(s):  
Thermal Effect ◽  
Radial Stress ◽  
Design Methodology ◽  
Internal Surface ◽  
Variable Density ◽  
Thermal Creep ◽  
Transition Theory ◽  
Circular Disc ◽  
Strain Rates ◽  
Rotating Disc

Purpose The purpose of this paper is to present study of thermal creep stresses and strain rates in a circular disc with shaft having variable density by using Seth’s transition theory. Design/methodology/approach Seth’s transition theory is applied to the problem of thermal creep transition stresses and strain rates in a thin rotating disc with shaft having variable density by finite deformation. Neither the yield criterion nor the associated flow rule is assumed here. The results obtained here are applicable to compressible materials. If the additional condition of incompressibility is imposed, then the expression for stresses corresponds to those arising from Tresca yield condition. Findings Thermal effect increased value of radial stress at the internal surface of the rotating disc made of incompressible material as compared to tangential stress and this value of radial stress further much increases with the increase in angular speed as compared to without thermal effect. Strain rates have maximum values at the internal surface for compressible material. Originality/value The model proposed in this paper is used in mechanical and electronic devices. They have extensive practical engineering application such as in steam and gas turbines, turbo generators, flywheel of internal combustion engines, turbojet engines, reciprocating engines, centrifugal compressors and brake disks.

Radial-displacement solution for a rotating disc with a hyperbolic thickness profile

1972 ◽  
Vol 7 (1) ◽  
pp. 7-8 ◽  
Author(s):  
M Holland
Keyword(s):  
General Solution ◽  
Radial Displacement ◽  
Special Solution ◽  
Rotating Disc ◽  
Thickness Profile ◽  
The Law

The general solution for radial displacement, and thereby radial and circumferential stresses, in a rotating disc having a thickness governed by the law t = Ar−n (which has become generally known as the disc with a hyperbolic profile) covers all cases but one. It is shown in this note that there is a unique thickness profile, produced when n=8/3+ v, at which the displacements and stresses become indeterminate. The special solution required for this case is developed below.

Three-particle effective operators of f → f transition theory

1997 ◽  
Vol 92 (5) ◽  
pp. 847-854 ◽  
Author(s):  
LIDIA SMENTEK ◽  
B.ANDES HESS
Keyword(s):  
Transition Theory ◽  
Effective Operators

Experimentally Applied Mechanical Load to the Human Knee Systematically Affects the Morphology of Articular Cartilage

2018 ◽  
Author(s):  
Grischa Bratke ◽  
Steffen Willwacher ◽  
David Maintz ◽  
Gert-Peter Brüggemann
Keyword(s):  
Articular Cartilage ◽  
Mechanical Load ◽  
Human Knee

Demographic gaps between Syrian and the European populations: What do they suggest?

2017 ◽  
Vol 7 (2) ◽  
pp. 207-230 ◽  
Author(s):  
Mustafa Murat Yucesahin ◽  
Ibrahim Sirkeci
Keyword(s):  
Transition Theory ◽  
World Population ◽  
Demographic Analysis ◽  
Demographic Differences ◽  
Syrian Crisis ◽  
The United Kingdom ◽  
Syrian Population ◽  
Displaced People ◽  
Near Future

Syrian crisis resulted in at least 6.1 million externally displaced people 983,876 of whom are in Europe while the rest are in neighbouring countries in the region. Turkey, due to its geographical proximity and substantial land borders with the country, has been the most popular destination for those fleeing Syria since April 2011. Especially after 2012, a sharp increase in the number of Syrian refugees arriving in Turkey was witnessed. This has triggered an exponential growth in academic and public interest in Syrian population. Numerous reports mostly based on non-representative sample surveys have been disseminated whilst authoritative robust analyses remained absent. This study aims to fill this gap by offering a comprehensive demographic analysis of the Syrian population. We focus on the demographic differences (from 1950s to 2015) and demographic trends (from 2015 to 2100) in medium to long term, based on data from World Population Prospects (WPP). We offer a comparative picture to underline potential changes and convergences between populations in Syria, Turkey, Germany, and the United Kingdom. We frame our discussion here with reference to the demographic transition theory to help understanding the implications for movers and non-movers in receiving countries in the near future.

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