摘要：Four-dimensional(4D)printing is an advanced form of three-dimensional(3D)printing with controllable and programmable shape transformation over *** are used as a controlling factor with multi-stage shape recovery,with emerging opportunities to customize the mechanical properties of bio-inspired *** print pattern of shape memory polymer(SMP)fbers strongly afects the achievable resolution,and consequently infuences several other physical and mechanical properties of fabricated ***,the deformations of bio-inspired structures due to actuator layout are more complex because of the presence of the coupling of multi-directional *** this study,the initial structure was designed from closed-shell behavior and divided into a general unit and actuator unit,the latter responsible for driving the *** stress confrontation between the actuator and the general unit was considered in the layout thermodynamic model,in order to eliminate the transformation produced by the uncontrolled shape memory behavior of the general *** critical and efective strategies for the layout design of actuators were proposed and then applied to achieve the desired accurate deformation of 3D-printed bilayer ***,the proposed approach was validated and adopted for fabricating a complex shell-like gripper structure.

摘要：inspired that the neck structure can stabilize the head from body movements and external dynamic vibration by the role of intervertebral disc and surrounding muscles,a novel multi-layer structure with nonlinear elastic components is proposed in this *** proposed structure is expected for loading the weight of the end effector and isolating bending vibration with lowfrequency in the range of 0.1 Hz to 1 ***,considering the loading,the potential energy,restoring force,and structural configuration in axial direction are ***,the dynamical restoring force and stiffness for bending are modelled for different structural parameters and configurations after the axial *** to the functions of the proposed structure required in applications including loading capacity and bending vibration isolation effectiveness,design criteria are carried *** to the realization of high-order quasi-zero stiffness property,the effective isolation band for bending vibration can be extended from about 0.08 *** addition,based on the proposed design criteria,the constructed multi-layer structure displays remarkable dynamical stabilization effectiveness in ultralow frequency *** proposed structure not only provides the biological explanations for car sickness,nausea,and airsickness of humans,but also solves the bottleneck techniques in bioinspired nonlinear isolation structural design for transverse dynamical stabilization,which has remarkable potential applications in the fields of mechanical arm,sensors in satellite etc.