**Preface**

The fatigue of metallic materials stands as a pivotal challenge in engineering applications. Addressing this micro-macro multi-scale issue necessitates interdisciplinary expertise, involving mechanics, materials science, mechanical engineering, numerical computing, and related fields. Exploring the fatigue damage mechanism and fatigue life prediction of metallic materials is of paramount importance. This reprint includes eleven articles that explore relevant topics, covering industrial materials such as steels, superalloys, aluminum alloys, etc. These articles are intended for academic researchers, engineers, and students seeking a comprehensive understanding of recent advancements in this field. We wish to convey our appreciation to all the authors for their valuable contributions, and we also acknowledge the dedicated efforts of the editorial staff for their time and commitment to the development of this reprint.

> **Haitao Cui and Qinan Han** *Editors*
