**Emanuel Willert**

Dr.-Ing. Emanuel Willert studied Engineering Science and Mechanical Engineering at the Technische Universitat (TU) Berlin and the Tomsk Polytechnic University. In 2019, he received his ¨ doctorate with honors from TU Berlin and the prize of the Dimitris N. Chorafas Foundation for his doctoral thesis on the fundamentals and applications of contact-impact problems. He is a co-author of the Handbook of Contact Mechanics and currently works as a post-doctoral researcher at the Institute of Applied Mechanics at TU Berlin. His main research interests are dynamic contact problems of inhomogeneous and inelastic materials, as well as the fundamentals of friction and wear.

#### **Preface to "Axisymmetry in Mechanical Engineering"**

The aim of the present Special Issue is to emphasize the phenomena, challenges and opportunities associated with symmetry in mechanical engineering. It is mainly addressed to researchers, scholars and practitioners in various fields of physics and engineering science. Several authors from different countries contributed to this Special Issue.

I, as a gues<sup>t</sup> editor, am grateful to Ms. Flora Wang and the Symmetry production team for the managemen<sup>t</sup> of the Special Issue and to the Symmetry editorial board, as well as to several reviewers for their scientific support.

> **Emanuel Willert** *Editor*
