Abstract: Self-bending, as the main form of deformation of 4D printing, has attracted the attention of researchers in recent years. The research on self-bending deformation of 4D printing structure is mainly based on experiments, and the 4D printing product design is guided by a large number of experiments. In order to solve this problem, a layout design method of incentive source for self-bending of 4D printing double-layer structure is proposed. Simple double-layer structure is used as the incentive source of complex structure deformation. The deformation results of 4D printing structure driven by multiple incentive sources can be simulated theoretically and the self-bending simulation of 4D printing structure can be realized only by testing the excitation source. At the same time, the idea of inverse calculation of layout parameters of incentive source are also put forward, which effectively solves the design problem of 4D printing self-bending structure product, and provides a new idea for the design of 4D printing structure. Finally, the effectiveness of the method is verified by experiments. It is found that the number of excitation sources has a greater impact on the bending of the structure than the spacing of excitation sources. The self-bending deformation of 4D printing double-layer structure can be controlled by reasonable design of the number and interval of excitation sources.

Key words: incentive source, 4D printing, self-bending, mindlin theory