A cyclic slip irreversibility based model for fatigue crack initiation of nickel base alloys - Archive ouverte HAL
Communication Dans Un Congrès Année : 2018

A cyclic slip irreversibility based model for fatigue crack initiation of nickel base alloys

Marion Risbet

Résumé

The opportunity to define a microscopic law of fatigue crack initiation using Manson-Coffin law formulated in terms of cyclic slip irreversibility deduced from AFM measurements is discussed for a polycrystalline superalloy with different grain sizes and precipitate sizes. The results show that the modified Manson-Coffin law, relating cyclic slip irreversibility parameter to fatigue crack initiation life, is sustained through a two-parameter power law: ε′f and c. The analysis suggests that the exponent c-value can be related to the degree of plastic strain incompatibility between grains, and the cumulative irreversible cyclic plastic strain to crack initiation is a relevant damage indicator for crack initiation. Consequently, our approach allows giving a physical base of engineering law.

Dates et versions

hal-02889619 , version 1 (04-07-2020)

Identifiants

Citer

Hsin Shen Ho, Marion Risbet, Xavier Feaugas. A cyclic slip irreversibility based model for fatigue crack initiation of nickel base alloys. 12th International Fatigue Congress, FATIGUE 2018;, May 2018, Poitiers, France. pp.04002, ⟨10.1051/matecconf/201816504002⟩. ⟨hal-02889619⟩
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