A combined model based fatigue life assessment method for a breathing cracked rotor

2017 ◽  
Author(s):  
Chaozhong Guo ◽  
Shi An ◽  
Weicheng Yang ◽  
Jihong Yan
Keyword(s):  
Fatigue Life ◽  
Assessment Method ◽  
Life Assessment ◽  
Cracked Rotor ◽  
Combined Model ◽  
Model Based ◽  
Fatigue Life Assessment

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.

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.

Fatigue Life Assessment of Steel Structures of a Metallurgy Crane

2015 ◽  
Vol 713-715 ◽  
pp. 126-129
Author(s):  
Bin Xu ◽  
Xiao Ying Tang ◽  
Yu Jiang ◽  
Wen Gong
Keyword(s):  
Fatigue Life ◽  
Dynamic Stress ◽  
Stress Test ◽  
Steel Structures ◽  
Assessment Method ◽  
Life Assessment ◽  
Working Cycle ◽  
Fatigue Life Assessment ◽  
Stress Spectrum ◽  
Practical Engineering

A fatigue life assessment method of steel structures was proposed in this study and applied in a metallurgy crane. Analytical method and experimental analysis were adopted to evaluate the static strength of steel structures, and then dynamic stress test was applied to get the stress history in a whole working cycle, which could determine the interest point and stress spectrum. Finally, rainflow method was applied to approach the stress spectrum, and then the fatigue life was predicted based on Miner rules. The results indicated that this method showed a potential application in practical engineering.

Fatigue Life Study of Hatch Corner on Large Bulk Carrier

2012 ◽  
Vol 457-458 ◽  
pp. 1008-1011
Author(s):  
Shu Li Sun ◽  
Yong He Xie ◽  
Jun Zhang
Keyword(s):  
Fatigue Life ◽  
Design Theory ◽  
Target Function ◽  
Assessment Method ◽  
Life Assessment ◽  
Bulk Carrier ◽  
Constraint Function ◽  
Life Study ◽  
Fatigue Life Assessment ◽  
Large Bulk

The fatigue life study of the hatch corner plays very important roles in design of hatch corner. The target function is the gravity of the hatch corner, and the constraint function is fatigue accumulation damage in the present paper. The structure optimal design theory has been combined with the fatigue life assessment method, to assess a hatch corner fatigue life of a large bulk carrier, and to optimize the hatch corner based on meeting the fatigue life. The hatch corner has been optimized under meeting yield strength and buckling strength. The numerical results show that the optimum method is fit to optimize the hatch corner.

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