Dynamic tensile properties of ROP/OCC natural hybrid fibers reinforced composites

The dynamic tensile properties of natural hybrid fibers reinforced composites with components of recycled-office-paper (ROP) fibers and old corrugated cardboard (OCC) fibers at different proportions are investigated by using an aluminum split Hopkinson tension bar (SHTB) at the strain rates ranging from 300/s to 1500/s. The influence on strain-stress relationship and strength by changing its component proportions are tested under quasi-static and dynamic loading. It is observed that the strain-rate sensitivities of the composites are varied by changing component proportions. The type of composites with 100% OCC fibers has a negative response to strain-rate effect. Nonetheless, that of 100% ROP fibers is not sensitive to the strain-rate effect. The type of composites with 75% ROP/25% OCC fibers is subject to strain-rate effect when the stress rates are less than 1000/s, but it has a negative response to the strain-rate effect when the strain rates are greater than 1000/s. The failure modes and their corresponding microscopic and macroscopic failure mechanism are also discussed. The composites with different component proportions are failed by combining with fibers break, fibers pull-out, fibers curvature shape changing and scattered, which are fibers failure and fiber-matrix bonding failure.