材料科学
热塑性聚氨酯
复合数
复合材料
变形(气象学)
熔融沉积模型
热塑性弹性体
弹性体
3D打印
执行机构
聚乳酸
模数
形状记忆合金
智能材料
机械工程
计算机科学
聚合物
工程类
人工智能
共聚物
标识
DOI:10.1016/j.compositesb.2021.108918
摘要
Reversible deformable structures manufactured by four-dimensional (4D) printing have potential applications in numerous fields, such as actuators, intelligent mechanisms, and soft robots. In this study, a novel low-cost approach for realizing reversible structural deformation by fused deposition modeling (FDM) 4D printing is proposed, which combines the thermodynamic properties of an elastomer material (thermoplastic polyurethane, TPU) and a shape-memory material (polylactic acid, PLA). PLA with stored pre-strain (which has a storage modulus that changes greatly with temperature) was used as the active layer, while TPU (which has a stable storage modulus) was used as the passive layer. A mathematical model was established to analyze the versatility of this combination of materials and clarify the requirements of the related materials. The experimental deformation results of the composite laminate structures (whose properties were controlled by the printing parameters and structural parameters) were consistent with the simulation results, and the deformation trends were consistent with the trends obtained by the mathematical model. A variety of models were manufactured using the composite laminate, which can realize reversible complex deformation with simulation pre-programming. This strategy is scalable, and the basic design principles have broad application prospects in reversible 4D printing.
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