Petro-based materials have made an irreplaceable promotion effect on the progress of science and technology and the improvement of life. However, nowadays, people pay more and more attention to the effect of human activities on the environment since global warming and pollution problems are severe. Composite materials with plant fibers as reinforcement are attractive materials to contribute to the lowering of environmental impact of engineering thanks to their lightweight, high specific stiffness and due to the recyclable and degradable character of the fibers. Thus, plant fiber composites are promising solutions to develop lightweight sustainable structures.

Bio-based materials are then becoming more and more popular in many application fields. When compared to synthetic fibers, such as glass fibers, it has been observed that they seem to be good candidates to improve the dynamic mechanical behavior of composite materials and structures. However, their heterogeneous and hierarchical microstructure, complex morphology and hygroscopicity lead to specific static, dynamic and fatigue behavior, including nonlinearities and moisture activation of some mechanisms. The main objective of this work is to provide a better characterization and understanding of dynamic mechanical properties in bio-based materials using various experimental techniques at different scales.