scholarly journals Transient Thermal Stresses in Pressure Vessels - Part II: Thermal Stress Calculation

1958 ◽  
Author(s):  
Keyword(s):  
Thermal Stress ◽  
Thermal Stresses ◽  
Pressure Vessels ◽  
Stress Calculation ◽  
Transient Thermal

scholarly journals Thermal-Stress Ratchet Mechanism in Pressure Vessels

1959 ◽  
Vol 81 (2) ◽  
pp. 190-194 ◽  
Author(s):  
D. R. Miller
Keyword(s):  
Growth Rate ◽  
Thermal Stress ◽  
Internal Pressure ◽  
Strain Hardening ◽  
Thermal Stresses ◽  
Pressure Vessels ◽  
Progressive Reduction ◽  
Ratchet Mechanism

The combination of cyclic thermal stresses and sustained internal pressure in a vessel is shown to be a source of progressive expansion of the vessel if the stresses are sufficiently high. Criteria presented allow determination of limits to be imposed on stresses in order to prevent progressive expansion or to allow estimation of the expansion per cycle where stresses are sufficient to produce growth. The effect of strain-hardening of the metal on progressive reduction of the growth rate is discussed.

A Three-Dimensional Treatment of Transient Thermal Stresses in a Circular Cylinder Due to an Arbitrary Heat Supply

1978 ◽  
Vol 45 (4) ◽  
pp. 817-821 ◽  
Author(s):  
Y. Takeuti ◽  
N. Noda
Keyword(s):  
Thermal Stress ◽  
Circular Cylinder ◽  
Cylindrical Surface ◽  
Heat Supply ◽  
Thermal Stresses ◽  
Three Dimensional ◽  
Numerical Results ◽  
Stress Problem ◽  
Transient Thermal Stress ◽  
Transient Thermal

We deal with a transient thermal stress problem in an infinitely long circular cylinder due to a nonuniform heat supply in circumferential and longitudinal directions on its cylindrical surface. The analysis is developed using the Boussinesq-Papkovich functions. Numerical results are given for several forms of heat supply.

On an Axisymmetric Coupled Thermal Stress Problem in a Finite Circular Cylinder

1983 ◽  
Vol 50 (1) ◽  
pp. 116-122 ◽  
Author(s):  
Y. Takeuti ◽  
R. Ishida ◽  
Y. Tanigawa
Keyword(s):  
Thermal Stress ◽  
Circular Cylinder ◽  
Thermal Stresses ◽  
Coupling Effect ◽  
Three Dimensions ◽  
Thermomechanical Coupling ◽  
Coupling Term ◽  
Wide Range ◽  
A New Technique ◽  
Transient Thermal

This paper presents a general treatment of the transient thermal stresses of a finite circular cylinder with consideration of the thermomechanical coupling effect using a new technique. The method used is quite useful for the solution of a wide range of transient thermal stress problems in two or three dimensions. From numerical results, we can find that there is a clear effect on the thermal stress distribution when the coupling term is taken into account.

Transient Thermal Stresses in Slabs and Circular Pressure Vessels

1953 ◽  
Vol 20 (2) ◽  
pp. 261-269
Author(s):  
M. P. Heisler
Keyword(s):  
Thermal Shock ◽  
Thermal Stresses ◽  
Pressure Vessels ◽  
Transient Temperature ◽  
Thermal Processes ◽  
Integral Theorem ◽  
Dimensionless Stress ◽  
Optimum Heating ◽  
Transient Thermal

Abstract This paper presents the results of computations for determining transient thermal stresses in slabs and circular pressure vessels. The process of solution adopted is to substitute transient-temperature formulas into the already available stress expressions. The expressions for thermal shock are transformed by means of a simple integral theorem into a form appropriate for analyzing the thermal processes commonly used to relieve thermal shock. A new dimensionless stress parameter is defined and applied to the determination of optimum heating or cooling times of massive pressure vessels.

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.

A Study of Cyclic Thermal Straining in a Welded Joint, Using a Closed-Loop, Servo-Controlled Testing Machine

1992 ◽  
Vol 114 (4) ◽  
pp. 422-427 ◽  
Author(s):  
Y. Z. Itoh ◽  
H. Kashiwaya
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Thermal Stress ◽  
Residual Stresses ◽  
Closed Loop ◽  
Thermal Stresses ◽  
Testing Machine ◽  
Step Test ◽  
Transient Thermal ◽  
Incremental Step

For investigating the origin of residual stresses in welded joints, the transient thermal stresses in a carbon-manganese-silicon steel (JIS SM41B), a cast martensitic stainless steel (JIS SCS5), an austenitic stainless steel (JIS SUS304), and a titanium alloy (Ti-6Al-4V) were investigated by subjecting round bar specimens, in which both ends were fixed, to thermal of cycles. The specimens were heated in air by high-frequency induction. The cyclic thermal straining tests were conducted for the case of a single thermal cycle and the case of multiple thermal cycles, using a closed loop, servo-controlled testing machine. The experimental results made clear that the transient thermal stress behavior was dependent on metallurgical effects, such as phase transformations, strain hardening, the Bauschinger effect, etc. The effects on phase transformation on the transient thermal stress behavior of SCS5 and SM41B were especially remarkable. However, the effects of phase transformations on the residual stresses due to the thermal straining cycle were negligible in SM41B and not observed in both SUS304 and Ti-6Al-4V. The residual stresses tended to increase with increase of the peak temperature of thermal cycles in SM41B, SUS304 and Ti-6Al-4V. However, when the peak temperature increased above 600°C in SCS5, the residual stress rapidly decreased and became compressive because of the expansion due to the martensite transformation. This study led to the conclusion that the transient thermal stresses for various peak temperatures could easily be obtained by an incremental step test using a single specimen and that this incremental step test could simply estimate the residual stress character of butt-welded joints.

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