An Investigation of Thermal Stress Ranges Under Stratification Loadings

1991 ◽  
Vol 113 (2) ◽  
pp. 326-331
Author(s):  
T. H. Liu ◽  
E. L. Cranford
Keyword(s):  
Thermal Stress ◽  
Stress State ◽  
Support System ◽  
Thermal Condition ◽  
Thermal Stresses ◽  
Piping System ◽  
Total Stress ◽  
Line System ◽  
Surge Line ◽  
Transient Thermal

This paper deals with a unique and severe stratification phenomena in the pressurizer surge line piping system. The methodology used in the calculation of total stress state includes pressure stresses from internal pressure, global thermal stresses from the constraining of the system by supports, local thermal stresses from hot/cold stratified condition, and transient thermal stresses in the pipe and at structural discontinuities. Special discussion on the interpolation to obtain moment loadings from one state of thermal condition to the next with nonlinear gapped support system is presented. Finally, the thermal cycling associated with operating transients in the surge line system is also addressed.

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.

Raman Thermometry of Polysilicon Microelectro-mechanical Systems in the Presence of an Evolving Stress

2006 ◽  
Vol 129 (3) ◽  
pp. 329-334 ◽  
Author(s):  
Mark R. Abel ◽  
Samuel Graham ◽  
Justin R. Serrano ◽  
Sean P. Kearney ◽  
Leslie M. Phinney
Keyword(s):  
Thermal Stress ◽  
Stress State ◽  
Spectral Characteristic ◽  
Temperature Dependence ◽  
Power Dissipation ◽  
Thermal Stresses ◽  
Stokes Shift ◽  
Stress Variation ◽  
Peak Location ◽  
Linewidth Broadening

In this work, the use of Raman Stokes peak location and linewidth broadening methods were evaluated for thermometry applications of polysilicon microheaters subjected to evolving thermal stresses. Calibrations were performed using the temperature dependence of each spectral characteristic separately, and the uncertainty of each method quantified. It was determined that the Stokes linewidth was independent of stress variation allowing for temperature determination, irrespective of stress state. However, the linewidth method is subject to greater uncertainty than the Stokes shift determination. The uncertainties for each method are observed to decrease with decreasing temperature and increasing integration times. The techniques were applied to mechanically constrained electrically active polysilicon microheaters. Results revealed temperatures in excess of 500°C could be achieved in these devices. Using the peak location method resulted in an underprediction of temperature due to the development of a relative compressive thermal stress with increasing power dissipation.

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.

scholarly journals Transient Thermal Stresses in a Reinforced Hollow Disk or Cylinder Containing a Radial Crack

1985 ◽  
Vol 107 (1) ◽  
pp. 212-219 ◽  
Author(s):  
Renji Tang ◽  
F. Erdogan
Keyword(s):  
Thermal Stress ◽  
Thermal Stresses ◽  
Radial Crack ◽  
Sudden Change ◽  
Base Material ◽  
Transient Temperature ◽  
Membrane Interface ◽  
Intensity Factors ◽  
Special Cases ◽  
Transient Thermal

In this paper, the transient thermal stress problem in a hollow cylinder or a disk containing a radial crack is considered. It is assumed that the cylinder is reinforced on its inner boundary by a membrane which has thermoelastic constants different than those of the base material. The transient temperature, thermal stresses, and the crack tip stress intensity factors are calculated in a cylinder which is subjected to a sudden change of temperature on the inside surface. The results are obtained for various dimensionless parameters and material constants. The special cases of the crack terminating at the cylinder-membrane interface and of the broken membrane are separately considered and some examples are given.

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