Research on the Micro-Mechanical State at Tip of Environmentally Assisted Cracking Based on Latin Hypercube Sampling Method

Environmentally assisted cracking (EAC) of nickel-based alloys is one of the most significant potential safety hazards in the primary circuit of nuclear power plants. To understand the influence of randomness on micro-mechanical state at tip of EAC, Latin hypercube sampling method is applied to anal...

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Bibliographic Details
Published in:Key engineering materials 2019-03, Vol.795, p.74-78
Main Authors: Xue, He, Zhao, Kuan, Zhao, Ling Yan
Format: Article
Language:English
Subjects:
Base metal
Compact tension
Computer simulation
Environmentally assisted cracking
Finite element method
Hazards
Hypercubes
Latin hypercube sampling
Material properties
Mechanical properties
Monte Carlo simulation
Nickel
Nickel base alloys
Nuclear engineering
Nuclear power plants
Nuclear safety
Numerical analysis
Oxide coatings
Primary circuits
Randomness
Uncertainty analysis
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Summary:Environmentally assisted cracking (EAC) of nickel-based alloys is one of the most significant potential safety hazards in the primary circuit of nuclear power plants. To understand the influence of randomness on micro-mechanical state at tip of EAC, Latin hypercube sampling method is applied to analyze the uncertainty of stress-strain in the oxide film at the EAC tip considering the uncertainties of load and material properties of base metal and oxide film. Meanwhile, to improve the efficiency of numerical analysis, MATLAB is employed in the secondary development for ABAQUS. With the help of finite element numerical simulation and Latin hypercube sampling method, the uncertainty of mechanical properties at tip of EAC in one-inch compact tension specimen is simulated and analyzed in this study. The results show that the randomness of material properties and load markedly affect the uncertainty of micro-mechanical state. Among the variables, The randomness of load has the greatest influence on uncertainty of strain, and Poisson`s ratio of oxide film is the smallest effect.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.795.74