Effect of the yield surface evolution on the earing defect prediction

Toros A.  Akşen; Mehmet  Firat

doi:10.3989/revmetalm.235

Autores/as

Toros A. Akşen Department of Mechanical Engineering, The University of Sakarya https://orcid.org/0000-0002-7087-3216
Mehmet Firat Department of Mechanical Engineering, The University of Sakarya https://orcid.org/0000-0002-3973-4736

DOI:

https://doi.org/10.3989/revmetalm.235

Palabras clave:

Embutición de copa, Endurecimiento cinemático, Formación de orejas, Modelado por elementos finitos, Plasticidad

Resumen

Aunque la predicción del defecto de formación de orejas en el proceso de embutición de copas está considerablemente relacionada con la forma de la superficie de fluencia, la evolución de la superficie de fluencia también es esencial para la forma final de la oreja. El problema de doblado-desdoblado es un tema fundamental que se produce en los hombros de la matriz y el punzón. Dado que el límite elástico depende de la trayectoria de carga en las cargas inversas, los modelos de endurecimiento convencionales utilizados en las condiciones de carga monótona producen resultados inexactos para predecir el perfil final de la oreja, por lo que debería incorporarse un modelo de endurecimiento cinemático a las ecuaciones constitutivas. Este estudio aclara el efecto de la evolución de la superficie de fluencia que implica la expansión y la traslación simultáneamente en la formación de las orejas. Se empleó una función de fluencia polinómica de sexto orden para caracterizar con precisión la forma de la superficie de fluencia, mientras que se implementó un modelo combinado de endurecimiento isotrópico-cinemático para representar la evolución de la superficie de fluencia. La traslación de la posición de la superficie de fluencia se definió mediante el modelo de endurecimiento Armstrong-Frederic. Las respuestas fuerza-impacto del punzón y los perfiles con forma de oreja se predijeron mediante el modelo de plasticidad implementado en Marc utilizando la subrutina de usuario Hypela2 y se compararon con los resultados experimentales. La hipótesis de endurecimiento combinado produjo un aumento de la altura media de la copa en comparación con la hipótesis de endurecimiento isótropo. Además, el HomPol6 junto con el endurecimiento combinado mostró una mejor concordancia con los resultados experimentales.

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