A Mechanism-Based Thermomechanical Fatigue Life Assessment Method for High Temperature Engine Components with Gradient Effect Approximation

2019 ◽  
Author(s):  
Radwan Hazime ◽  
Thomas Seifert ◽  
Cherng-Chi Chang ◽  
Abdallah Kassir ◽  
Asok Sethy
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Thermomechanical Fatigue ◽  
Assessment Method ◽  
Life Assessment ◽  
Gradient Effect ◽  
Fatigue Life Assessment ◽  
Engine Components

scholarly journals Creep Fatigue Life Assessment of a Pipe Intersection with Dissimilar Material Joint by Linear Matching Method

2016 ◽  
Vol 853 ◽  
pp. 366-371
Author(s):  
Daniele Barbera ◽  
Hao Feng Chen ◽  
Ying Hua Liu
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Direct Method ◽  
Life Assessment ◽  
Dissimilar Material ◽  
Matching Method ◽  
Fatigue Life Assessment ◽  
Creep Fatigue ◽  
The Impact ◽  
Linear Matching Method

As the energy demand increases the power industry has to enhance both efficiency and environmental sustainability of power plants by increasing the operating temperature. The accurate creep fatigue life assessment is important for the safe operation and design of current and future power plant stations. This paper proposes a practical creep fatigue life assessment case of study by the Linear Matching Method (LMM) framework. The LMM for extended Direct Steady Cycle Analysis (eDSCA) has been adopted to calculate the creep fatigue responses due to the cyclic loading under high temperature conditions. A pipe intersection with dissimilar material joint, subjected to high cycling temperature and constant pressure steam, is used as an example. The closed end condition is considered at both ends of main and branch pipes. The impact of the material mismatch, transitional thermal load, and creep dwell on the failure mechanism and location within the intersection is investigated. All the results demonstrate the capability of the method, and how a direct method is able to support engineers in the assessment and design of high temperature component in a complex loading scenario.

scholarly journals Fatigue Life Assessment Method for Prestressed Concrete Sleepers

2017 ◽  
Vol 3 ◽  
Author(s):  
Ruilin You ◽  
Dan Li ◽  
Chayut Ngamkhanong ◽  
Rims Janeliukstis ◽  
Sakdirat Kaewunruen
Keyword(s):  
Fatigue Life ◽  
Prestressed Concrete ◽  
Assessment Method ◽  
Life Assessment ◽  
Fatigue Life Assessment

Multiaxial Fatigue Life Assessment Method Based on the Mean Value of Modified Second Invariant of the Deviatoric Stress

2014 ◽  
Vol 224 ◽  
pp. 15-20
Author(s):  
Łukasz Pejkowski ◽  
Dariusz Skibicki
Keyword(s):  
Fatigue Life ◽  
Hydrostatic Stress ◽  
Assessment Method ◽  
Mean Value ◽  
Multiaxial Fatigue ◽  
Deviatoric Stress ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Fatigue Life Estimation ◽  
The Mean

Stress invariants approach to the multiaxial fatigue life estimation is generally based on the root mean square value of second invariant of the deviatoric stress amplitude and the value of hydrostatic stress. Such an approach omits a significant part of the information about multiaxial load history. It is particularly noticeable in case of non-proportional loadings, which lead to a reduction of fatigue life (i.e. [1–3]). In this work a new method based on the mean value of modified second invariant of the deviatoric stress has been presented.

A Study on the Fatigue Life Assessment for Urban EMU Structure

2007 ◽  
Vol 345-346 ◽  
pp. 283-286
Author(s):  
Jong Duk Chung ◽  
Jang Sik Pyun ◽  
Ouk Sub Lee
Keyword(s):  
Fatigue Life ◽  
Endurance Limit ◽  
Assessment Method ◽  
Cumulative Damage ◽  
Life Assessment ◽  
Random Load ◽  
Urban Transit ◽  
Fatigue Assessment ◽  
Fatigue Life Assessment ◽  
Approach Method

In these days, most urban railway vehicles have been serviced under the random load application. However, it is considered to be a major factor of safety to predict the fatigue life for structures. It is thus required that fatigue assessment method for cumulative damage approach while Korea domestic regulations practices only the only has endurance limit approach. With this endurance limit approach, fatigue life prediction is impossible. In this research, the fatigue assessment for urban transit structure by using of cumulative damage approach method and related theories are presented.

scholarly journals Fatigue life assessment of the structure with widespread damage exposed to high temperature

2020 ◽  
Vol 26 ◽  
pp. 402-408
Author(s):  
A. Grbović ◽  
Ž. Božić ◽  
S. Kirin ◽  
G. Kastratović ◽  
A. Sedmak ◽  
...  
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Life Assessment ◽  
Fatigue Life Assessment

Fatigue Life Assessment of Boiler Components Under Cyclic Operating Conditions

2006 ◽  
Author(s):  
Jinhua Shi ◽  
William Bell ◽  
Alan M. Laird
Keyword(s):  
Fatigue Life ◽  
Cold Start ◽  
Assessment Method ◽  
Operating Conditions ◽  
Life Assessment ◽  
Steam Generators ◽  
Fatigue Life Assessment ◽  
Cyclic Operation ◽  
Start Up ◽  
High Temperature Components

A fatigue life assessment application has been implemented using the methodology given in the European Standard EN 12952-3. The assessment application can use data from the Distributed Control System (DCS) of the plant or, to improve accuracy, use component metal temperatures if thermocouples have been fitted across the component of interest. Fatigue assessments have been carried out on typical high temperature components in Heat Recovery Steam Generators (HRSGs) and a large coal fired boiler which were subject to cyclic operation. The assessments carried out used recorded plant operating DCS and thermocouple data and examined main cyclic events, e.g. shutdown/cold start-up cycle, etc. Detailed finite element analyses have also been conducted on a typical superheater header using as input the plant operating data. Calculated fatigue damage levels for both methods are compared and it is shown that comparable values are obtained. In addition, further assessment has been performed on a component where the period of operation included several shutdown/cold start cycles and many sub-cycles. On completion of the above studies, Mitsui Babcock have implemented the fatigue assessment method into a simple plant life monitoring system.

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