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Co-continuous multimaterial composites are novel types of multifunctional structures.

This study focuses on numerical and experimental investigation of the mechanical behavior

of 3D periodic single-material cellular D-structure and the corresponding co-continuous

composite. Different volume fractions of desired geometry were fabricated by multimaterial

fused deposition modeling (FDM) technology and compressive mechanical properties of

the samples were obtained by mechanical tests. It was observed that embedding a

hyperelastic material to the cellular structure dramatically hindered the shearing

bands in localized regions to develop, thereby made it feasible for composite material

to undergo larger deformations without failure. Furthermore, it was demonstrated that

the soft phase in multimaterial composite induces a homogeneous deformation to

cellular structure, which enhances the load-bearing capacity and flexibility of the whole

composite. In this paper, it was shown that the co-continuous multimaterial composite

provides a well-balanced approach between desired flexibility and load-bearing which is

referred to as compliancy. A strain recovery between 82 and 93% was also measured

when unloading for multimaterial composite. These integrated properties could be

valuable to various engineering applications such as synthetic limbs, soft robotics,

and wearable structures as shoes and splints.

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