scholarly journals Estimation of Inner Surface Temperature History from Outer Surface of a Pipe with Coating for Thermal Stress Evaluation

2014 ◽  
Vol 2014.27 (0) ◽  
pp. 271-272
Author(s):  
Shiro Kubo ◽  
Yuuki Yamamoto
Keyword(s):  
Thermal Stress ◽  
Surface Temperature ◽  
Outer Surface ◽  
Temperature History ◽  
Stress Evaluation ◽  
Inner Surface

Development of Inverse Analysis of Heat Conduction and Thermal Stress for Elbow: Part I

2013 ◽  
Author(s):  
Seiji Ioka ◽  
Shiro Kubo ◽  
Mayumi Ochi ◽  
Kiminobu Hojo
Keyword(s):  
Heat Conduction ◽  
Thermal Stress ◽  
Transfer Function ◽  
Surface Temperature ◽  
Outer Surface ◽  
Inverse Analysis ◽  
Temperature History ◽  
Analysis Method ◽  
Inner Surface ◽  
Inverse Analysis Method

Thermal fatigue may develop in piping elbow with high temperature stratified flow. To prevent the fatigue damage by stratified flow, it is important to know the distribution of thermal stress and temperature history in a pipe. In this study, heat conduction inverse analysis method for piping elbow was developed to estimate the temperature history and thermal stress distribution on the inner surface from the outer surface temperature history. In the inverse analysis method, the inner surface temperature was estimated by using the transfer function database which interrelates the inner surface temperature with the outer surface temperature. Transfer function database was calculated by FE analysis in advance. For some patterns of the temperature history, inverse analysis simulations were made. It was found that the inner surface temperature history was estimated with high accuracy.

scholarly journals Thermal Elastic-Plastic Stress Analysis of an Aluminium Composite Disc under Linearly Decreasing Thermal Loading

2008 ◽  
Vol 17 (3) ◽  
pp. 096369350801700 ◽  
Author(s):  
Muzaffer Topcu ◽  
Gurkan Altan ◽  
Hasan Callioglu ◽  
Burcin Deda Altan
Keyword(s):  
Thermal Stress ◽  
Stress Analysis ◽  
Tangential Stress ◽  
Outer Surface ◽  
Thermal Stresses ◽  
Stress Component ◽  
Aluminium Composite ◽  
Hardening Material ◽  
Elastic Plastic ◽  
Inner Surface

In this study, an elastic-plastic thermal stress analysis of an orthotropic aluminium metal matrix composite disc with a hole has been investigated analytically for non-linear hardening material behaviour. The aluminium composite disc reinforced curvilinearly by steel fibres is produced under hydraulic press. The mechanical properties of the composite disc are obtained by tests. A computer program is developed to calculate the thermal stresses under a linearly decreasing temperature from inner surface to outer surface. Elastic, elastic-plastic and residual thermal stress distributions are obtained analytically from inner surface to outer surface and they are presented in tables and Fig. s. The elastic-plastic solution is performed for the plastic region expanding around the inner surface. The magnitude of the tangential stress component has been found out in this study to be higher than the magnitude of the radial stress component. Besides, the tangential stress component is compressive at the inner surface and tensile at the outer surface. The magnitude of the tangential residual stress component is the highest at the inner surface of the composite disc.

Development of Inverse Analysis of Heat Conduction and Thermal Stress for Elbow (Part I)

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Seiji Ioka ◽  
Shiro Kubo ◽  
Mayumi Ochi ◽  
Kiminobu Hojo
Keyword(s):  
Heat Conduction ◽  
Surface Temperature ◽  
Inverse Analysis ◽  
Power Plants ◽  
Fatigue Cracking ◽  
Stratified Flow ◽  
Temperature History ◽  
Inverse Heat Conduction ◽  
Analysis Method ◽  
Inner Surface

High temperature stratified flow sometimes caused thermal fatigue cracking in power plants. To prevent fatigue damage by stratified flow, it is important to know temperature distribution history in a pipe. In this study, inverse heat conduction analysis method for an elbow model was developed to estimate the inner surface temperature from the measured outer surface temperature. In the method, the transfer function database inter-relating the inner surface temperature with the outer one was used. For several patterns of the temperature history, the inverse analysis simulations were performed and the accuracy of the estimated inner surface temperature was shown.

Identification of Error Sources in Fatigue Analyses for Thermal Loadings

2006 ◽  
Author(s):  
Franz Binder ◽  
Dieter Gantz
Keyword(s):  
Surface Temperature ◽  
Outer Surface ◽  
Common Good ◽  
Error Sources ◽  
Fatigue Monitoring ◽  
Inner Surface ◽  
Mesh Density ◽  
External Component ◽  
Basic Objective ◽  
The One

To identify thermal loadings (thermal shocks and thermal stratification), in German NPPs special fatigue monitoring systems have been installed. The detailed temperature measurement uses sheathed thermocouples, which are located on the external component surface. Tightening straps are used for the widespread method of locking the thermocouples into position. The basic objective of the paper is to identify several sources of error in fatigue analyses and to evaluate their specific importance. In fatigue analyses based on the outer-surface temperature, the thermal situation at the inner-surface has to be determined. This leading analysis step is not regulated in the ASME III code. In the paper, the variance in the calculated fatigue is quantified for different inner surface temperature profiles with a common good compliance to the outer surface temperature. Another focus of the paper is the presentation of findings concerning the exactness of fatigue analyses based on FEA. The effect of geometrical truncation (mesh density) and the time-increments on the calculated fatigue level is shown. Furthermore, regarding discontinuities with thermal shock loading, the differences in the calculated fatigue between applying ASME NB-3200 on the one hand and NB-3600 on the other are quantified. Finally, the uncertainty in the calculated fatigue associated with the known variance of the physical material property values (E-Modulus, thermal conductivity, thermal expansion) is highlighted.

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