This book offers a selection of original peer-reviewed papers presented at the Sixth International Tunisian Congress on Mechanics, COTUME 2023, held on March 17-19, 2023, in Monastir, Tunisia. It covers advances in engineering design, structure modelling and materials engineering. It also discusses cutting-edge topics in structural dynamics and vibration, fluid mechanics and sustainable energy production. With a good balance of fundamentals and industrial applications, this book offers a useful reference for graduate students, researchers, and professionals in the field of mechanical, industrial, production, manufacturing, and materials engineering. Organized by the Tunisian Association of Mechanics (ATM), COTUME 2023 was also honored by the active participation of the French Association of Mechanics (AFM), the Moroccan Society for Mechanical Science (SMSM) and the Algerian Association for Technology Transfer (A2T2).