scholarly journals 702 An Inverse Analysis Method for Determination of Fluid Temperature History Reducing Transient Stress Intensity Factor of Crack in Pipe during Start-up and Shut-down

2010 ◽  
Vol 2010.23 (0) ◽  
pp. 162-163
Author(s):  
Mitsumasa MAEKAWA ◽  
Shiro KUBO ◽  
Seiji IOKA
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Inverse Analysis ◽  
Temperature History ◽  
Fluid Temperature ◽  
Analysis Method ◽  
Transient Stress ◽  
Start Up ◽  
Inverse Analysis Method

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 Numerical evaluation of the modulus of longitudinal elasticity in structural round timber elements of the Eucalyptus genus

2011 ◽  
Vol 31 (5) ◽  
pp. 1007-1014 ◽  
Author(s):  
André L. Christoforo ◽  
Túlio H. Panzera ◽  
Fabiano B. Batista ◽  
Paulo H. R. Borges ◽  
Francisco A. R. Lahr
Keyword(s):  
Inverse Analysis ◽  
Numerical Evaluation ◽  
Least Square Method ◽  
Least Square ◽  
Analysis Method ◽  
The Finite Element Method ◽  
Eucalyptus Citriodora ◽  
Inverse Analysis Method ◽  
Round Timber

Currently, the standards that deal with the determination of the properties of rigidity and strength for structural round timber elements do not take in consideration in their calculations and mathematical models the influence of the existing irregularities in the geometry of these elements. This study has as objective to determine the effective value of the modulus of longitudinal elasticity for structural round timber pieces of the Eucalyptus citriodora genus by a technique of optimization allied to the Inverse Analysis Method, to the Finite Element Method and the Least Square Method.

Development of Inverse Analysis Method of Heat Conduction and Thermal Stress for Elbow—Part II

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Kiminobu Hojo ◽  
Mayumi Ochi ◽  
Seiji Ioka ◽  
Shiro Kubo
Keyword(s):  
Heat Conduction ◽  
Thermal Stress ◽  
Inverse Analysis ◽  
Maximum Stress ◽  
Fluid Temperature ◽  
Inverse Heat Conduction ◽  
Analysis Method ◽  
Inner Surface ◽  
Pressure Test ◽  
Inverse Analysis Method

An inverse heat conduction analysis method for piping elbow was developed to estimate the temperature and stress distribution on the inner surface by measuring the outer surface temperature. In the paper, the accuracy for the thermal stress calculation using the inverse heat conduction analysis method was confirmed by comparing with the reference results from normal FE heat conduction and thermal stress analyses. In the case of the measured-basis fluid temperature input from a high temperature–pressure test, the inverse analysis method estimated the maximum stress change by 7% conservative comparing with the normal FE analyses.

Sign in / Sign up

Export Citation Format

Share Document