Thermal stress and fatigue damage of central receiver tubes during their preheating

In this study, the thermal stress at a mixing tee was calculated by the finite element method using temperature transients obtained by a fluid dynamics simulation. The simulation target was an experiment for a mixing tee, in which cold water flowed into the main pipe from a branch pipe. The cold water flowed along the main pipe wall and caused a cold spot, at which the membrane stress was relatively large. Based on the evaluated thermal stress, the magnitude of the fatigue damage was assessed according to the linear damage accumulation rule and the rain-flow procedure. Precise distributions of the thermal stress and fatigue damage could be identified. Relatively large axial stress occurred downstream from the branch pipe due to the cold spot. The position of the cold spot changed slowly in the circumferential direction, and this was the main cause of the fatigue damage. In the thermal stress analysis for fatigue damage assessment, it was concluded that the detailed three-dimensional structural analysis was not required. Namely, for the current case, a one-dimensional simplified analysis could be used for evaluating the fatigue damage without adopting the stress enhancement factor Kt quoted in the JSME guideline.

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Thermal stress analysis for fatigue damage evaluation at a mixing tee

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2011.05.029 ◽

2011 ◽

Vol 241 (8) ◽

pp. 2674-2687 ◽

Cited By ~ 28

Author(s):

Masayuki Kamaya ◽

Akira Nakamura

Keyword(s):

Thermal Stress ◽

Stress Analysis ◽

Fatigue Damage ◽

Damage Evaluation ◽

Thermal Stress Analysis

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The use of a simplified analytical expression for metastable thermal stress analysis and its application to creep–fatigue damage of a 2.25Cr 1Mo thick walled component

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2009.07.007 ◽

2010 ◽

Vol 32 (2) ◽

pp. 368-375 ◽

Cited By ~ 5

Author(s):

Warwick M. Payten ◽

Ken U. Snowden ◽

Philip Bendeich

Keyword(s):

Thermal Stress ◽

Stress Analysis ◽

Fatigue Damage ◽

Thermal Stress Analysis ◽

Analytical Expression ◽

Creep Fatigue

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Crack Propagation and Simulation of Thermal Fatigue

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.217-219.2287 ◽

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.

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