1011 Development of Sophisticated Method for Thermal Fatigue Prevention : (3) Research Subjects for Evaluating Thermal Stress and Fatigue Damage

2010 ◽  
Vol 2010 (0) ◽  
pp. 1208-1210
Author(s):  
Masayuki KAMAYA ◽  
Masakazu OKAZAKI ◽  
Takamoto ITOH ◽  
Naoto KASAHARA
Keyword(s):  
Thermal Stress ◽  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Research Subjects ◽  
Sophisticated Method

Crack Propagation and Simulation of Thermal Fatigue

2012 ◽  
Vol 217-219 ◽  
pp. 2287-2292
Author(s):  
Hui Yu ◽  
Xin Liang Zang ◽  
Li Gang Liu
Keyword(s):  
Fatigue Crack ◽  
Thermal Stress ◽  
Crack Propagation ◽  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Damage Mechanics ◽  
Fatigue Crack Initiation ◽  
Temperature Fields ◽  
Thermal Fatigue Crack ◽  
Initiation And Propagation

In this paper, the thermal fatigue damage phenomenon in the comprehensive temperature environment is studied by means of thermal fatigue damage mechanics and FEM technology, the thermal-stress analysis modal under the comprehensive thermodynamic boundary conditions is established, the regularities of distribution of temperature fields, thermal stress fields effected by the comprehensive coupled variables are investigated. According to the modify of material characteristics under the high-temperature alternating thermal impact conditions and the integrated influences of environment, mechanical parameter and material microstructure to the fatigue fracture, numerical modal of thermal fatigue crack initiation and propagation are developed, so the characteristics of thermal fatigue crack propagation are studied, which are verified by the experiments, it is very significant to study thermal damage question of working equipments in the similar conditions.

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

Characterization of thermal fatigue damage of thermal barrier produced by atmospheric plasma spraying

2004 ◽  
Vol 187 (2-3) ◽  
pp. 185-193 ◽  
Author(s):  
N. Mesrati ◽  
Q. Saif ◽  
D. Treheux ◽  
A. Moughil ◽  
G. Fantozzi ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Thermal Barrier

Visualization of Thermal Fatigue Damage Distribution With Elastic-Plastic FEA

2018 ◽  
Author(s):  
Junya Miura ◽  
Terutaka Fujioka ◽  
Yasuhiro Shindo
Keyword(s):  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Thermal Loading ◽  
304 Stainless Steel ◽  
Element Analysis ◽  
Steel Cylinder ◽  
Elastic Plastic ◽  
Calculation Results ◽  
Type 304 ◽  
Cae System

This paper proposes simplified methods to evaluate fatigue damage in a component subjected to cyclic thermal loading, in order to visualize the distribution of usage factor using a graphical user interface (GUI) incorporated in a widely-used commercial CAE. The objective is to perform the evaluation and visualization using a standard desktop PC. In the previous paper, three simplified methods based on elastic finite-element analysis (FEA) were proposed in place of the method in the procedures employed in ASME Section III Subsection NH. In this paper, the methods have been improved for elastic-plastic FEA. A previously performed thermal fatigue test with a type 304 stainless steel cylinder was simulated. Heat transfer, elastic, and inelastic analyses were conducted. Simultaneously with the analyses performed, the equivalent total strain ranges and fatigue usage factor distributions were calculated using user subroutines developed in this study including three newly proposed simplified and ASME NH-based methods. These distributions can be visualized on a GUI incorporated in a commercial FEA code. The calculation results were consistent with the distribution of cracks observed. In addition, by using these, the analysts can visualize these distributions using their familiar CAE system.

Analysis of Structure Characteristics and Improvement of Turbo-Supercharger Bearing

2014 ◽  
Vol 496-500 ◽  
pp. 707-710
Author(s):  
Hui Gan ◽  
Kun Yu Yang ◽  
Xiao Liang Yang
Keyword(s):  
Experimental Study ◽  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Structural Characteristics ◽  
Structure Characteristics ◽  
Design Scheme ◽  
Friction Bearing ◽  
Adjustment Test

The reliability of the gas turbo-supercharger can be affected by the faults such as the cauterization of the floating bearing of the supercharger, the carbonization of the rotor and getting stuck, the deformation of the blade and heat cracking of the nozzle ring. The design scheme is proposed by using friction bearing taking the place of the floating bearing, because the main reason of the cauterization of the bearing is the increase of the inside clearance of the floating sleeve, which is testified by the actual rpm measurement of the floating sleeve on the floating bearing and the adjustment test of the inside and outside clearances of the bearing. The experimental study on the structural characteristics of turbocharger bearing effectively prevents turbo-supercharger floating bearing from being cauterized, solves the problem of thermal fatigue damage, and improves turbocharger reliability.

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