Crack bifurcation behavior of coarse-grained copper under cyclic torsion combined with axial static loading

Jin Yue Liu; Rong  Hua Li; Ji Chen

doi:10.3989/revmetalm.248

Autores/as

Jin Yue Liu School of Mechanical Engineering, Liaoning Petrochemical University https://orcid.org/0000-0002-4649-5323
Rong Hua Li School of Mechanical Engineering, Liaoning Petrochemical University https://orcid.org/0000-0001-7564-9101
Ji Chen School of Mechanical Engineering, Liaoning Petrochemical University https://orcid.org/0000-0002-0052-5339

DOI:

https://doi.org/10.3989/revmetalm.248

Palabras clave:

Bifurcación de grieta, Cobre, Fatiga, Tensión estática axial, Torsión

Resumen

Debido a que los comportamientos de crecimiento de grietas por fatiga son cruciales para la evaluación segura de componentes estructurales, se estudiaron los comportamientos de propagación de grietas en microestructuras de cobre con un tamaño de grano grueso (CG Cu) sometido a torsión cíclica combinada con diferentes tensiones estáticas axiales. El comportamiento de bifurcación de la grieta está relacionado con la amplitud de deformación aplicada. Cuando la amplitud de deformación es menor, tanto el tipo como la magnitud de la tensión axial no tienen un efecto significativo sobre la dirección en la que se bifurca la grieta primaria, que viene determinada principalmente por la posición del plano normal máximo. Sin embargo, cuando la amplitud de deformación es mayor, la grieta bifurcada se desvía visiblemente del plano normal máximo, lo que puede atribuirse al alto grado de deformación plástica y a las microfisuras causadas por las bandas de deslizamiento a lo largo de la dirección longitudinal.

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