thermal fatigue

thermal fatigue

thermal fatigue
Stages of thermal fatigue or blade creep on a typical turbine blade. In the primary stage the initial rate of creep decreases rapidly, in secondary stage the rate decreases more slowly or may be substantially constant and in tertiary stage, the rate increases rapidly and leads eventually to fracture.
A kind of metal fatigue caused by repeated heating and cooling. It is prominent in turbines where some heating or cooling takes place each time a power setting is changed. Also called creep damage. See also creep (ii).
References in periodicals archive ?
In service, the joints regularly cycle between ~50 and 80% of melting point due to cycles of resistance heating and natural cooling, which causes thermal expansion and contraction of all phases and, therefore, thermal fatigue due to the mismatch in the coefficient of thermal expansion (CTE) at interfaces.
Thermal fatigue, a type of fatigue, is the result of cyclic temperature changes depending on the operating conditions of materials, causing in the formation of microcracks on the surface of the materials and these micro-cracks propagations cause structural damages to the structure.
All surface-mount components require a low-cycle thermal fatigue analysis for military products, and the thermal expansion characterization of new parts is something our industry frequently investigates beyond what the supply base offers.
These solders need to be equipped with a combination of good mechanical properties, high thermal fatigue properties, and high heat resistance.
Therefore, these results will contribute to make the space structures safer and prevent from thermal failure due to thermal fatigue and extreme cold temperature.
As power plants become older engineers need screening criteria to eliminate the risk of thermal fatigue. A number of programs have been launched to develop fatigue monitoring systems for the nuclear power plant components [2, 3].
To some degree, all metals that are repeatedly heated and cooled are subject to thermal fatigue, a cyclic stress that weakens the metal to an eventual point of failure.
A common failure that aging HVAC systems suffer in fall and winter months is the breakdown of the heat exchanger due to thermal fatigue. To some degree, all metals that are repeatedly heated and cooled are subject to thermal fatigue, a cyclic stress that weakens the metal to an eventual point of failure.
In consequence, thermal load for EGR coolers has been increasing and the interaction of boiling with thermal fatigue is now a critical issue during development.
It also avoids costly receiver tubes that undergo thermal fatigue and can bring the entire system down with the smallest of leaks.
In addition, gold-based solders are resistant to corrosion, provide superior thermal fatigue resistance, and exhibit excellent joint strength.