Hydrothermal aging mechanisms and service life prediction of twisted bamboo fiber wound composites

•Hydrothermal behavior and mechanism of TBF-wound composites, which have not yet been elucidated, were investigated.•The hydrothermal aging temperature more significantly affects the mechanical properties of the composites than humidity.•Hydrothermal aging significantly deteriorates the fiber/resin interface in the composites.•The mechanical properties of TBF-NOL composites in hydrothermal environments are predicted to remain at 40–50% over extended periods.•Understanding the hydrothermal aging mechanism of the composites helps predict their service life.