J0310204 Development of Residual Life Assessment Method for Low Alloy Steel Boiler lube by using Temperature Estimate Method

2015 ◽  
Vol 2015 (0) ◽  
pp. _J0310204--_J0310204-
Author(s):  
Hideo MATSUMURA ◽  
Daisuke ARAKAWA ◽  
Hidetaka NISHIDA
Keyword(s):  
Alloy Steel ◽  
Residual Life ◽  
Assessment Method ◽  
Life Assessment ◽  
Low Alloy Steel ◽  
Temperature Estimate ◽  
Estimate Method ◽  
Residual Life Assessment ◽  
Steel Boiler

Multiple Cracks Interaction Model and Residual Life Assessment Methods for the High-Temperature Structure

2013 ◽  
Author(s):  
Jun Si ◽  
Fu-Zhen Xuan ◽  
Shan-Tung Tu
Keyword(s):  
High Temperature ◽  
Residual Life ◽  
Interaction Model ◽  
Assessment Method ◽  
Life Assessment ◽  
Multiple Cracks ◽  
Temperature Structure ◽  
Combination Rules ◽  
Residual Life Assessment ◽  
High Temperature Structure

Multiple cracks are often found in many high-temperature structural components. The interaction and coalescence of multiple cracks may significantly influence the service lives of these high-temperature components. The interaction effect on multiple cracks is investigated under creep conditions in this paper. The results indicated that interaction of multiple cracks is different between the time dependent fracture characterized by C*-integral and linear elastic fracture noted by SIF. The level of conservatism of the current alignment rule was discussed under creep conditions. Then combination rules and regularization of multiple cracks under creep conditions are developed. Based on these analyses, the assessment method for the residual life prediction of high-temperature structure containing multiple cracks is developed.

Residual Life Assessment of In-Service High Temperature Components by Small Punch Creep Test

2007 ◽  
Author(s):  
Jianhua Shan ◽  
Xiang Ling ◽  
Zhenmai Qian
Keyword(s):  
High Temperature ◽  
Residual Life ◽  
Assessment Method ◽  
Life Assessment ◽  
Analysis Method ◽  
Creep Life ◽  
Uniaxial Creep ◽  
Life Analysis ◽  
High Temperature Components ◽  
Residual Life Assessment

The knowledge of mechanical long term behaviour under static loading for high temperature components requires methodologies for residual life assessment in order to employ the full potential of materials, particularly in non-destructive methods. In this paper, in order to apply small punch creep (SPC) test to the residual creep life assessment of in-service high temperature components, a variety of SPC tests for Cr5Mo steel in a protective Argon atmosphere were carried out, which used disc test specimens of 10mm in diameter and 0.5mm in thickness extracted both new material and in-service high temperature components. The relationship of the creep deflection curve, the test load, rupture time and ductility of miniature specimens were investigated. Based on SPC test and finite element numerical analysis methods, a novel residual life assessment method was proposed to substitute conventional uniaxial creep life analysis method by introducing an initial creep damage parameter. Moreover, the fractographic observation and the structural damage detection analysis were examined. Finally, the results using conventional uniaxial creep life analysis method were studied to validate the reliability of SPC life assessment method.

Residual service life estimation of bridges

2021 ◽  
Author(s):  
Mayank Bajaj ◽  
Biswajit Bhattacharjee
Keyword(s):  
Residual Life ◽  
Concrete Bridges ◽  
Life Assessment ◽  
Residual Service Life ◽  
Chloride Ingress ◽  
Service Life Estimation ◽  
Residual Life Assessment ◽  
Existing Bridges ◽  
Residual Service

<p>While concrete structures perform well in many situations, lack of durability has emerged as a significant issue for asset owners. A review of past bridge failures was done to identify the most probable causes of bridge failures. This study has tended to focus on current models used for estimating the time to deterioration of concrete bridges instigated by Chloride ingress and Fatigue. Subsequently, mathematical modelling of the best-suited deterioration model is done to arrive at the residual life of two existing bridges. This work has highlighted high variability in the parameters used to describe the durability related properties of in-situ aged concrete. A realistic residual life assessment can be achieved by correct evaluation of these parameters by periodic testing of bridge samples</p>

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