Cyclic Compression Properties of High‐Strength, Recoverable, Light‐Curable 4D Printing Materials Reinforced With Glass Fibers

ABSTRACT This study developed a glass fiber reinforced photopolymerization resin based on digital light processing technology and explored its applications in Octet truss and Box lattice. The results show that the bonding between glass fibers and resin significantly improves the strength and energy absorption performance of the resin. When the glass fiber content is 30 wt%, the tensile strength of the sample has increased more than 4 times, the compressive strength of the Octet truss structure is 12 times higher than unreinforced material, and the Box structure is 20 times higher. The addition of glass fiber not only has little effect on the toughness of the material but also makes the sample exhibit 4D printing characteristics: shape memory performance under thermal excitation. The vast majority of samples remain structurally intact after 60% compression strain and can be restored to their original state through thermal excitation. The content of glass fiber has a regulatory effect on the shape‐memory recovery rate under thermal excitation. Through multiple compression experiments, the strength and energy absorption capacity of glass fiber reinforced materials are still significantly higher than those of unreinforced materials after cyclic compression, proving the effectiveness of glass fiber in improving the strength and toughness of light cured 3D printing materials.