Development of a Facility for High Cycle Thermal Fatigue Testing in Pure Water and Measurement of Heat Transfer Coefficient in an Annular Gap between Rotating Inner and Stationary Outer Cylinders.

Hirano, Akihiko; Hayashi, Makoto; Takehara, Hidetoshi; Tanaka, Masaaki; Iikura, Takahiko

doi:10.1299/kikaia.64.1468

Cited by 2 publications

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“…Prior to the experiment, the heat convection coefficient, H, was measured using the specimen with many thermo-couples to measure the metal temperature and the water temperature (8) . The results showed that the relationship between the heat convection coefficient, H, and the frequency, f, is given by the following equation.…”

Section: Discussionmentioning

confidence: 99%

“…The frequency of thermal fatigue cycles in recirculation pipes and pumps is estimated at about 10Hz, thus the cracks that initiate are referred to as high cycle thermal fatigue cracks. Hirano et al (8,9,10) manufactured a high frequency thermal fatigue testing apparatus with simulated BWR water environment. They found that the convection coefficients between the water and the specimen surface were remarkably high: 50 to 70kW/m 2 K for thermal cycle frequencies lower than 5Hz and 70 to 120kW/m 2 K for thermal cycle frequencies higher than 5Hz.…”

Section: Introductionmentioning

confidence: 99%

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High Cycle Thermal Fatigue Crack Initiation and Growth Behavior in a Simulated BWR Environment

Hayashi

Hirano

2012

JMMP

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At a tee junction point in a piping system, hot and cold water are mixed with each other in a whirl. The vibrating mixing boundary between the hot and cold water causes a temperature fluctuation on an inside surface of the pipe just after the connection point. The temperature fluctuation yields a cyclic thermal stress near the pipe surface and results in the crack initiation. In this study the thermal fatigue tests using disk-like specimens in simulated BWR environment were performed and the thermal fatigue crack initiation strength was compared with the mechanical fatigue strength. Furthermore, the thermal fatigue crack arrest depth was analyzed using linear elastic fracture mechanics. The arrest depth was found to be in proportion to the reciprocal root of the frequency of temperature fluctuation, and the experimental results agreed well with the analysis

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Cycle Thermal Fatigue Crack Initiation and Growth Behavior in a Simulated BWR Environment

Hayashi

Hirano

2012

JMMP

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High-Cycle Thermal Fatigue Crack Initiation and Growth Behavior in a Semi-Infinite Plate Model

Hayashi

2001

Journal of Pressure Vessel Technology

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At a T-junction in piping system, hot and cold water mixes in a whirl. The vibrating mixing boundary between the hot and cold water causes a temperature fluctuation on the inner surface of the pipe just after the connection point at the T-junction, and this temperature fluctuation yields a cyclic thermal stress near the pipe surface, resulting in crack initiation. In this study, the thermal stress distribution was analyzed for a semi-infinite plate model. The allowable water temperature range for the fatigue crack initiation was determined based on the mechanical fatigue test results. The thermal fatigue crack arrest behavior was analyzed based on the distributions of the stress intensity factor. The arrested crack depth is found to be in proportion to the reciprocal root of the frequency of the temperature fluctuation and is 3.8 mm for the frequency of 1 Hz.

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Development of a Facility for High Cycle Thermal Fatigue Testing in Pure Water and Measurement of Heat Transfer Coefficient in an Annular Gap between Rotating Inner and Stationary Outer Cylinders.

Cited by 2 publications

References 0 publications

High Cycle Thermal Fatigue Crack Initiation and Growth Behavior in a Simulated BWR Environment

High Cycle Thermal Fatigue Crack Initiation and Growth Behavior in a Simulated BWR Environment

High-Cycle Thermal Fatigue Crack Initiation and Growth Behavior in a Semi-Infinite Plate Model

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