Enabling Rapid Filler‐Free Magnetic Actuation of Shape Memory Polymer Composites Using Woven Carbon Fabrics as Eddy Current Susceptor

ABSTRACT Magnetic induction heating (MIH), an efficient actuation method for shape memory polymer composites (SMPC), traditionally relies on magnetic fillers that are challenging to disperse and lack reinforcing capability for load‐bearing applications. This study introduces a filler‐free MIH approach for actuation of carbon fiber reinforced SMPCs, leveraging the inherent electrical conductivity of carbon fabrics for the eddy current mechanism of MIH. We systemically studied the effect of lay‐up architecture on mechanical, MIH, and shape memory responses by comparing non‐hybrid and hybrid laminates combining 0° and 45° plies. The hybrid 45°/0°/45° laminate was identified as the optimal configuration, resolving the issue of bending‐induced damage found in 0°‐dominant lay‐ups while retaining higher strength. This laminate exhibited faster magnetic actuation response, achieving full shape recovery in just 30 s compared to 80 s required for 45°/45°/45°. This rapid actuation stems from a synergy imparted by the 0° mid‐ply. Its lower in‐plane electrical resistance promotes stronger eddy currents for more efficient MIH, while its higher storage modulus increases the stored elastic energy during shape fixation. Overall, this work validates the dual role of carbon fibers as both structural reinforcement and eddy current susceptor, offering a design pathway for high‐performance, load‐bearing adaptive composites with filler‐free MIH actuation.