Modeling Steady State Creep in Functionally Graded Thick Cylinder Subjected to Internal Pressure

2009 ◽  
Vol 44 (11) ◽  
pp. 1317-1333 ◽  
Author(s):  
Tejeet Singh ◽  
V.K. Gupta
Keyword(s):  
Steady State ◽  
Internal Pressure ◽  
Functionally Graded ◽  
Steady State Creep ◽  
Thick Cylinder

Effect of Disc Geometry on the Steady State Creep in a Rotating Disc Made of Functionally Graded Materials

2012 ◽  
Vol 736 ◽  
pp. 183-191 ◽  
Author(s):  
Manish Garg ◽  
B.S. Salaria ◽  
V.K. Gupta
Keyword(s):  
Steady State ◽  
Creep Behaviour ◽  
Pure Aluminum ◽  
Functionally Graded ◽  
Steady State Creep ◽  
Strain Rates ◽  
Rotating Disc ◽  
Graded Materials ◽  
Functionally Graded Composite ◽  
Silicon Carbide Particles

The steady state creep behaviour of a rotating FGM disc having linearly varying thickness has been investigated. The disc is assumed to be made of functionally graded composite containing non-linearly varying radial distribution of silicon carbide particles in a matrix of pure aluminum. The creep behaviour of the composite has been described by threshold stress based law. The effect of varying the disc thickness gradient has been analyzed on the stresses and strain rates in the FGM disc. It is observed that the radial and tangential stresses induced in the FGM disc decrease throughout with the increase in thickness gradient of the disc. The strain rates also decrease with the increase in thickness gradient of the FGM disc, with a relatively higher decrease near the inner radius. The increase in disc thickness gradient results in relatively uniform distribution of strain rates and hence reduces the chances of distortion in the disc.

Steady-State Creep Analysis of the Weight Loadings of Furnace Tubes on Multiple Supports

1959 ◽  
Vol 81 (2) ◽  
pp. 115-125
Author(s):  
J. L. Jacobowitz ◽  
C. K. Mader
Keyword(s):  
Steady State ◽  
Internal Pressure ◽  
High Temperatures ◽  
Tube Wall ◽  
Steady State Creep ◽  
Design Consideration ◽  
Secondary Effects ◽  
Creep Stress ◽  
Creep Analysis ◽  
Very High

Analysis of creep stress-strain relationships is made for horizontally supported furnace tubes including the effect of tube weight and internal pressure. Steady-state creep effects through the tube wall due to axially symmetrical heal input are also analyzed for these conditions. The original Bailey approach to the pressure problem only is extended to the larger scope undertaken. Maximum permissible tube spans are derived based on accepted criteria for creep stress and deflections. The results of this work indicate that maximum allowable tube spans may often be theoretically increased beyond present usual design limits except for a few specific materials and instances where short spans are required at very high temperatures. In actual tube design, consideration should be given to experience in operation of any particular type of furnace so that secondary effects may be minimized. Increased economies in costs and flexibility in furnace layout as well as rational span determination are expected from use of these results.

Steady-State Creep Deformations and Stresses in FGM Rotating Thick Cylindrical Pressure Vessels

2014 ◽  
Vol 31 (1) ◽  
pp. 1-6 ◽  
Author(s):  
M. Z. Nejad ◽  
Z. Hoseini ◽  
A. Niknejad ◽  
M. Ghannad
Keyword(s):  
Steady State ◽  
Strain Rate ◽  
Equivalent Strain ◽  
Pressure Vessels ◽  
Functionally Graded ◽  
Steady State Creep ◽  
Graded Materials ◽  
Equivalent Strain Rate ◽  
Closed Form Analytical Solution ◽  
Creep Deformations

AbstractIn the present study, a closed-form analytical solution for the steady-state creep stresses of rotating thick cylindrical pressure vessels made of functionally graded materials (FGMs) is carried out. Norton's law governs the creep response of the material. Exact solutions for stresses and strain rate are obtained under the plane strain condition. How different material parameters involved in Norton's law affect radial and circumferential stresses together with the equivalent strain rate in rotating thick-walled cylindrical vessels under internal pressure is investigated. The result obtained shows that the property of FGMs has a significant influence on the equivalent creep strain rate and stresses distributions along the radial direction.

General Solution for Mechanical and Thermal Stresses in a Functionally Graded Hollow Cylinder due to Nonaxisymmetric Steady-State Loads

2003 ◽  
Vol 70 (1) ◽  
pp. 111-118 ◽  
Author(s):  
M. Jabbari ◽  
S. Sohrabpour ◽  
M. R. Eslami
Keyword(s):  
Steady State ◽  
Material Properties ◽  
Thermal Stresses ◽  
Separation Of Variables ◽  
Functionally Graded ◽  
Two Dimensional ◽  
Power Functions ◽  
Complex Fourier Series ◽  
Graded Material ◽  
Thick Cylinder

In this paper, the general theoretical analysis of two-dimensional steady-state thermal stresses for a hollow thick cylinder made of functionally graded material is developed. The temperature distribution is assumed to be a function of radial and circumferential directions with general thermal and mechanical boundary conditions on the inside and outside surfaces. The material properties, except Poisson’s ratio, are assumed to depend on the variable r and they are expressed as power functions of r. The separation of variables and complex Fourier series are used to solve the heat conduction and Navier equations.

Sign in / Sign up

Export Citation Format

Share Document