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It is presented the methodology applied to analyze the crack growth in each component under fatigue or stress corrosion crack (SCC). The ASME Code Section XI is used widely and therefore the evaluation of crack propagation is performed in accordance with its rules. For the fatigue crack growth the Paris Law is adopted with its parameters obtained experimentally. Some ASTM procedures are cited to perform the tests that establish the curve range of stress intensity factor versus crack growth for low-alloy carbon, ferritic, and stainless steels for typical PWR environments. A similar approach is adopted to evaluate crack propagation for stress corrosion cracking. Once the critical crack length is known it is possible to obtain the time or the number of cycles to failure by fatigue or SCC and, in addition, establish a time interval between inspections.

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Crack Growth by Fatigue and Stress Corrosion Cracking

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  • 发表日期：

    2025年

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  • Jose Eduardo Maneschy,
  • Carlos Alexandre de J. Miranda

摘要

It is presented the methodology applied to analyze the crack growth in each component under fatigue or stress corrosion crack (SCC). The ASME Code Section XI is used widely and therefore the evaluation of crack propagation is performed in accordance with its rules. For the fatigue crack growth the Paris Law is adopted with its parameters obtained experimentally. Some ASTM procedures are cited to perform the tests that establish the curve range of stress intensity factor versus crack growth for low-alloy carbon, ferritic, and stainless steels for typical PWR environments. A similar approach is adopted to evaluate crack propagation for stress corrosion cracking. Once the critical crack length is known it is possible to obtain the time or the number of cycles to failure by fatigue or SCC and, in addition, establish a time interval between inspections.