Plastic Deformation of a Solid Cylinder of Temperature Dependent Properties Subjected to Cyclic Loading

1995 ◽  
Author(s):  
Shahriar Jahanian
Keyword(s):  
Cyclic Loading ◽  
Thermal Loading ◽  
Pressure Vessels ◽  
Solid Cylinder ◽  
Temperature Dependent ◽  
Nuclear Fuel Element ◽  
Incremental Growth ◽  
Temperature Dependent Properties ◽  
Transient Thermal ◽  
Structural Behaviors

Abstract There are many practical instances of structural behaviors where the incremental increase of deformation occurs under cyclic loading, such as ratcheting in nuclear fuel element cans, incremental growth of pressure vessels or turbine cases, etc. This increase of deformation may lead to the failure of structure. For an incremental collapse to occur, it is necessary for different parts of the structure to yield at different stages of loading and unloading cycle. When the thermal loading is present, the properties of the material are temperature dependent. Accordingly the yielding occur at the earlier stage. The situation may get worse when the thermal loading is coupled with the mechanical one. This paper presents a quasi-static, uncoupled thermo-elastoplastic analysis based on incremental theory of plasticity. The behavior of a solid cylinder subjected to torsion and transient thermal loading for one cycle is investigated. The influence upon behavior of nonlinear-strain hardening in the material is investigated.

SPH Analysis for Transient Thermal Stress of FGMs with Temperature-Dependent Properties

2015 ◽  
Vol 1096 ◽  
pp. 297-301
Author(s):  
Gui Ming Rong ◽  
Hiroyuki Kisu
Keyword(s):  
Thermal Stress ◽  
Thermal Conditions ◽  
Functionally Graded ◽  
Temperature Dependent ◽  
Graded Materials ◽  
Initial Stage ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Temperature Dependent Properties ◽  
Transient Thermal

A formulation using the deviatoric stress and the continuity equation is extended to the analysis of the dynamic response of functionally graded materials (FGMs) subjected to a thermal shock by smoothed particle hydrodynamics (SPH), in which temperature dependent properties of materials are considered. Several dynamic thermal stress problems are analyzed to investigate the fluctuation of thermal stress at the initial stage under three types of thermal conditions, with the addition of two kinds of mechanical boundary conditions.

Transient thermal behavior of radial fins of rectangular, triangular and hyperbolic profiles with temperature-dependent properties using DTM-FDM

2017 ◽  
Vol 24 (3) ◽  
pp. 675-682 ◽  
Author(s):  
Sobhan Mosayebidorcheh ◽  
Mohammad Rahimi-Gorji ◽  
D. D. Ganji ◽  
Taha Moayebidorcheh ◽  
O. Pourmehran ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Temperature Dependent ◽  
Temperature Dependent Properties ◽  
Transient Thermal

On Transient Thermal Stresses in Viscoelastic Materials With Temperature-Dependent Properties

1961 ◽  
Vol 28 (2) ◽  
pp. 193-207 ◽  
Author(s):  
Rokuro Muki ◽  
Eli Sternberg
Keyword(s):  
Thermal Stresses ◽  
Constitutive Law ◽  
Time Dependent ◽  
Temperature Dependent ◽  
Infinite Extent ◽  
Temperature Dependent Properties ◽  
Transient Thermal ◽  
Temperature Time ◽  
Symmetric Temperature ◽  
Actual Test

This paper deals with the quasi-static analysis of transient thermal stresses in the linear theory of viscoelastic solids with temperature-dependent properties. The underlying constitutive law rests on the temperature-time equivalence hypothesis. Following an exposition of the theoretical framework exact solutions to two specific problems are deduced: The first concerns the thermal stresses in a slab of infinite extent, generated by a temperature field that depends arbitrarily on the thickness co-ordinate and time; the second application concerns the stresses produced in a sphere by an arbitrary time-dependent radially symmetric temperature distribution. The numerical illustrations of the results obtained include a quantitative study based on actual test data for a polymethyl methacrylate.

Thermo-Mechanical Fatigue of Thick-Walled Components of Power Devices

2014 ◽  
Vol 224 ◽  
pp. 87-92
Author(s):  
Jerzy Okrajni ◽  
Mariusz Twardawa
Keyword(s):  
Thermal Loading ◽  
Thermal Stresses ◽  
Pressure Vessels ◽  
Operating Conditions ◽  
Power Devices ◽  
Stress Strain ◽  
Mechanical Fatigue ◽  
Transient Thermal ◽  
Temperature Strain ◽  
Plant Components

The main purpose of this work is to determine the mechanical behaviour of power plant components operating under mechanical and thermal loading. Computer FEM modelling of temperature strain and stress fields along with temperature measurements have been applied as the methods of research. The stress-strain diagrams for the selected points of plant components have been determined. It is readily apparent from the stress-strain characteristics that under unsteady operating conditions, components analysed in this paper, especially in the case of boiler restarts, may operate with transient thermal stresses which sometimes reach values higher than the yield point. Consequently, a thermo-mechanical fatigue process takes place in the materials of the components in question. This paper seeks to justify the necessity of the application of design methods which take into consideration the influence of TMF processes on the durability of highly reliable pressure vessels.

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