Ramie/Polylactic Acid Laminates With Excellent Quasi‐Static and Low–High‐Velocity Impact Properties for Aircraft Interior Structures

ABSTRACT

To meet needs in the sustainable development of aircraft interiors, this study evaluates the mechanical behaviors of ramie/polylactic acid laminates with different fiber volume fractions () under quasi‐static tensile and bending, low‐velocity loadings, and the response mechanism of laminates with optimal under low‐high‐velocity impacts. Theoretical model, digital image correlation, and high‐speed photography were combined for characterization. Results show that the peak tensile and bending strength of laminates with 60% achieve 99.81 MPa and 148.73 MPa, respectively. The increase of high crystallinity ramie fiber and its volume fraction dominate the modulus improvement of laminates under quasi‐static tensile and bending loadings. Theoretical model points out that the lumen‐induced fiber‐dependent porosity has a non‐negligible influence on the mechanical properties. Matrix deficiency leads to a decrease in strength of laminates with 70% . In impact response, the laminates with 60% exhibited the optimal impact resistance among tested laminates. Energy absorption mechanism transition from fiber breakage at 5 J to crack propagation at 10 J under low‐velocity impact. Dominant failure of laminates is shearing under high‐velocity impact at thickness direction. These findings demonstrate that such laminates, featuring a good combination of quasi‐static tensile and bending and low‐high‐velocity impact capabilities, represent sustainable candidates for aircraft interiors.