Tendon-Driven Functionally Gradient Soft Robotic Gripper 3D Printed with Intermixed Extrudate of Hard and Soft Thermoplastics

材料科学 复合材料 3d打印 挤出胀大 分层(地质) 聚合物 软机器人 熔融沉积模型 3D打印 挤压 生物医学工程 计算机科学 构造学 生物 古生物学 人工智能 医学 执行机构 俯冲
作者
Mohammad Abu Hasan Khondoker,Nadia Baheri,Dan Sameoto
出处
期刊:3D printing and additive manufacturing [Mary Ann Liebert]
卷期号:6 (4): 191-203 被引量:31
标识
DOI:10.1089/3dp.2018.0102
摘要

Fused deposition modeling (FDM) printers are some of the most common additive manufacturing (AM) systems in use today. One of their most significant drawbacks compared with alternative AM techniques is that they are unable to easily integrate multiple materials into a single process to produce gradient parts, which have different mechanical properties within a single printed object. Much of this limitation comes from the need to have single filaments as inputs to a printed part, and weak bonding between thermoplastics if they are not chemically miscible. In this work, a simple method to actively enhance the bonding strength between chemically immiscible thermoplastics using a static intermixer inserted into the nozzle of a multi-input FDM system has been demonstrated. This system was successfully used to enhance adhesion between rigid and soft, stretchable polymers, which have nearly three orders of magnitude of difference in elastic moduli. The replaceable intermixer within the print head permits direct comparison of side-by-side or intermixed coextrusion processes. The bond strength between adjacent deposited fibers in intermixed printing was found to be at least 12 times higher than that of the fibers in side-by-side printing. As a proof-of-concept, tendon-driven soft robotic fingers with functionally gradient materials produced from mechanically interlocked dissimilar polymers have been printed and characterized. The fingers printed with intermixed coextrusion of hard and soft polymers do not show any noticeable interface failure after 10,000 cycles of operation, whereas other samples printed with side-by-side coextrusion experienced layer delamination before 10,000 cycles. By using a two-tendon system, these fingers have an agonist–antagonist balanced structure to control its stiffness during operation. The soft robotic gripper fabricated from these printed fingers shows its capability to grasp irregular objects with sizes larger than the gripper holder by actuating in both inward and outward directions.
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