Retraction to: Int J Mech Mater Eng 13, 4 (2018)

https://doi.org/10.1186/s40712-018-0089-7

The authors have retracted this article (Hosseinzadeh, Alizadeh, & Ganji, 2018) because it has significant overlap of text, equations and figures with a previously published article (Hosseinzadeh, Amiri, Ardahaie, & Ganji, 2017).

K Hosseinzadeh did not respond to correspondence about this retraction. Neither M Alizadeh nor DD Ganji has replied to any correspondence.