creep damage

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).
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In this study, AE tests were conducted under different loading rates on coal using the SHIMADZU AG-X250KN rock servo test machine and AE21C AE instrument to explore the effects of different moisture contents and the characteristics of coal creep damage by AE.
[3] conducted a multiloading triaxial creep test on red sandstone through treatment at different temperatures in range of 25[degrees]C to 1000[degrees]C and proposed a creep damage model which considers the damage variable from the aspect of dissipation energy, without taking the thermal effect on the rock damage model into account.
Shi, "Study on creep damage constitutive relation of greenschist specimen," Chinese Journal of Rock Mechanics and Engineering, vol.
Prakash, "Creep damage characterization using non-linear ultrasonic techniques," ActaMaterialia., vol.
"A Review of Methods to Estimate Creep Damage in LowAlloy Steel Power Station Steam Pipes", STRAIN, 45: 316-331, ISSN: 0039-2103.
Electromagnetic acoustic resonance to assess creep damage in Cr-Mo-V steel, Japan Soc.
Liu, "Study of creep damage constitutive relation of granite considering thermal effect," Chinese Journal of Rock Mechanics and Engineering, vol.
* Permanently installed monitoring of creep damage (Imperial College) a Non-linear material inspection (University of Bristol)
Operating at low frequencies reduced the self-healing effect and the effects of creep damage. Increasing the frequency to the point where temperature rise did not stabilize resulted in thermal induced failure that deviated significantly from the model.