Methods of Assessment of Thermal Striping Fatigue Damage

2006 ◽  
pp. 229-239
Author(s):  
Ian S. Jones
Keyword(s):  
Fatigue Damage ◽  
Thermal Striping

Fatigue Damage Evaluation for Thermal Striping Phenomena Using Analytical Spectrum Method

2005 ◽  
Author(s):  
Satoshi Okajima ◽  
Shinsuke Sakai ◽  
Satoshi Izumi ◽  
Atsushi Iwasaki ◽  
Naoto Kasahara
Keyword(s):  
Fatigue Damage ◽  
Analytical Methods ◽  
Safety Margin ◽  
Closed Form Solution ◽  
Design Stage ◽  
Piping System ◽  
Damage Evaluation ◽  
Random Loading ◽  
Simple Method ◽  
Thermal Striping

It is well known that fatigue damage accumulates around T-junctions of piping system where two kinds of fluid with different temperatures are mixed. This phenomenon is called thermal striping, and simple method for evaluating the fatigue damage derived from this phenomenon is greatly important for both design and maintenance stages. However, the evaluation of the thermal stress derived from the thermal striping is rather difficult since the evaluation requires complicated analyses such as fluid mixing, heat transfer, and heat conduction. In addition, the closed-form solution to describe the stress-range distribution under random loading has not been established yet since the rainflow cycle-counting method is not suitable to the analytical treatment. Though numerical calculation may be available for the evaluation, it requires time-consuming work and is not practical for design stage. For this reason, an analytical method for evaluating the fatigue damage directly from stress power spectrum density (PSD) is desired. In this paper, the feasibility study to apply analytical methods to the evaluation of thermal-striping damage is examined. The analytical methods are applied to the fatigue damage evaluation from the stress PSD that was obtained by the thermal striping experiment. Finally, the applicability and problem of each method will be discussed. In order to apply the envelope PSD to design, the property of safety margin associated with the PSD is investigated too.

An evaluation of fatigue damage gages

1967 ◽  
Author(s):  
R. MATLOCK
Keyword(s):  
Fatigue Damage

Fatigue damage accumulation around notches

2004 ◽  
Vol 46 (6) ◽  
pp. 309-313
Author(s):  
Yutaka Iino ◽  
Hideo Yano
Keyword(s):  
Fatigue Damage ◽  
Damage Accumulation ◽  
Fatigue Damage Accumulation

3D Characterization of Thermal Fatigue Damage in Monofilament Reinforced Copper for Heat Sink Applications in Fusion Reactor Systems

2012 ◽  
Vol 49 (5) ◽  
pp. 278-289
Author(s):  
M. Schöbel ◽  
H.P. Degischer ◽  
A. Brendel ◽  
B. Harrer ◽  
M. Di Michiel
Keyword(s):  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Heat Sink ◽  
Fusion Reactor
Sign in / Sign up

Export Citation Format

Share Document