Matrix stiffness: A key parameter to control hydro-elasticity and morphing of 3D printed biocomposite

The swelling of natural fibers is often a drawback when considering structural applications biocomposites. However, this mechanism represents the key towards development Hygromorph BioComposites (HBC). This investigation aims to understand hydroexpansion 3D-printed continuous flax-fiber reinforced biocomposites and effect matrix stiffness. Four flax fiber-based were selected with wide range Water moisture sorption tests performed in combination measurements. Tensile elastic properties obtained while curvature asymmetric lay-ups was studied track internal hydroscopic stress state. An increase stiffness reduces water absorption, evolution thanks constraining on that it generates. From opposite point view, can be increased low stiffness, opening way for 4D-printed HBC improved performance.