Study on LCF Lifetime Prediction of Thermal Shock

Wei Mao Zhao; Wei Zheng Zhang; Zhao Ju Qin

doi:10.4028/www.scientific.net/AMM.152-154.924

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 152-154Study on LCF Lifetime Prediction of Thermal Shock

Study on LCF Lifetime Prediction of Thermal Shock

Abstract:

Gray cast iron specimen was heated to a fixed temperature with high frequency induction heating equipment, then was cooled to room temperature by spraying water to the heated surface. This process was repeated until a crack whose length exceeds 3mm appeared. Transient cyclic heat transfer and stress-strain FEA analysis was conducted to obtain specimen’s stress-strain state, then different LCF life prediction methods based on strain and energy were presented and contrasted, and results showed modified dissipated energy method with maximal hydrostatic pressure was more accurate than other methods. With the help of modified dissipated energy method, the relationship between thermal shock life, highest cooling temperature and cooling speed was studied, and the effect law of highest cooling temperature and cooling heat transfer coefficient on life was obtained.

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Periodical:

Applied Mechanics and Materials (Volumes 152-154)

Pages:

924-930

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.152-154.924

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Online since:

January 2012

Authors:

Wei Mao Zhao, Wei Zheng Zhang, Zhao Ju Qin

Keywords:

Dissipated Energy, Gray Cast Iron, Life Prediction, Thermal Shock

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