Addendum: Suchy, L.; et al. Influence of Hub Parameters on Joining Forces and Torque Transmission Output of Plastically Joined Shaft–Hub–Connections with a Knurled Contact Surface. Machines 2018, 6, 16

The authors, while validating calculations, found discrepancies with Equations (9) and (10) in their paper [1]. Only with this correction can the presented results be achieved.

The new Equations (9) and (10) are as follows:

$${\mathrm{A}}_1=\frac{h_{knurl}·t}{2}-{(h_{knurl}-h_{groove}\left(Q_H\right))}^2·\tan \left(\alpha /2\right)$$

(9)

$$h_{groove}\left(Q_H\right)=\{ \begin{array}{c}\frac{I_{geo}}{2} ; Q_H<0.65 ; \forall \phi \\ \frac{I_{geo}}{2}-\left(\frac{4}{5}{Q}_H-\frac{1}{2}\right)mm ; 0.85>Q_H\ge 0.65; \phi <15°\\ 3.6·{10}^{-5}{\phi }^2+5.3·{10}^{-3}\phi +0.1444; 0.85>Q_H\ge 0.65 ;\phi \ge 15° \end{array}$$

(10)