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Multidirectional 3d printed functionally graded modular joint actuated by TCPFL muscles for soft robots

Bio-design and Manufacturing 2019年第4期2卷 256-268页

作者： Armita Hamidi Yara Almubarak Yonas Tadesse Humanoid Bio-robotics and Smart Systems(HBS)LaboratoryMechanical Engineering DepartmentThe University of Texas at DallasRichardsonTX 75080USA

Highly deformable bodies are essential for numerous types of applications in all sorts of environments. Joint-like structures comprising a ball and socket joint have many degrees of freedom that allow mobility of many biomimetic structures. Recently, soft robots are favored over rigid structures for their highly compliant material, high-deformation properties at low forces, and ability to operate in di fficult environments. However, it is still challenging to fabricate complex designs that satisfy application constraints due to the combined e ffects of material properties, actuation method, and structural geometry on the performance of the soft robot. Therefore, a combination of a rigid joint and a soft body can help achieve modular robots with fully functional body morphology. Yet, the fabrication of soft parts requires extensive molding for complex shapes, which comprises several processes and can be time-consuming. In addition, molded connections between extremely soft materials and hard materials can be critical failing points. In this paper, we present a functionally graded 3d-printed joint-like structure actuated by novel contractile actuators. Functionally graded materials (FGMs) via 3d printing allow for extensive material property enhancement and control which warrant tunable functionalities of the system. The 3d-printed structure is made of 3 rigid ball and socket joints connected in series and actuated by integrating twisted and coiled polymer fishing line ( TCPFL) actuators, which are con fined in the FGM accordion-shaped channels. The implementation of the untethered T CPFL actuation system can be highly bene ficial for deployment in environments that require low vibrations and silent actuation. The fishing line TCP actuators produce an actuation strain up to 40% and bend the joint up to 40° in any direction. The T CPFL can be actuated individually or as a group to control the bending trajectory of the modular joint, which is bene ficial when deployed i

关键词： Functionally graded 3d-printed Joint Multidirectional Fishing line TCP

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Improving Strength of Carbon Fiber Grafted Carbon Nanotube Reinforced Thermoplastic Composites by 3d-printed Molding

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Journal of Harbin Institute of Technology(New Series) 2019年第2期26卷 71-79页

作者： Ruonan Wang Haihong Wu Ziyue Guo Chuntai Liu Changyu Shen College of Mechanical Engineering Henan University of Technology National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University School of Mathematics Sun Yat-sen UniversityZhuhai Campus

To improve the strength of carbon fiber(CF) reinforced Polycaprolactam(PA6) composites, controlled amounts of carbon nanotubes(CNTs) were grafted onto the surface of CF to prepare the hybrid reinforcement(HR). We used HR to fabricate laminate and H-sample to test the interfacial bonding strength(IBS) of the composites by means of a novel process called three-dimensional printed molding(3 d-PM). By using the melt drop printing method, we measured the contact angles between PA6 and CF(without sizing) and between PA6 and HR. The IBS and the mechanical properties of the composites were obtained by the tensile test. The experimental result indicated that CF grafted by 0.25% weight fraction of CNT or more could develop a special microstructure similar to the micro-pits on the surface of CF, which improved the wettability of CF and PA6 due to the increased surface area and the roughness of CF. When the weight fraction of CNT reached 0.25%, the IBS increased by 41.8%, the tensile strength by 130%, and the interfacial shear strength(IFSS) by 238%. The interfacial dimple fracture was observed by Scanning Electron Microscope(SEM), which revealed that the composites were able to absorb more deforming energy before fracture. The modified surface microstructure of CF would prevent crack propagation at the interface and increase the mechanical properties of thermoplastic composites(TPCs).

关键词： thermoplastic composites interfacial bonding strength interfacial shear strength 3d-printed molding

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Modern Composite Materials and Technical Strategies in Posttraumatic Augmentation Rhinoplasty

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Chinese Journal Of Plastic and Reconstructive Surgery 2020年第1期2卷 59-62页

作者： Jiaman GAO dejun CAO department of Plastic and Reconstructive Surgery Shanghai Ninth HospitalShanghai Jiao Tong University School of MedicineShanghai

The selection of ideal posttraumatic augmentation rhinoplasty materials and technical strategies has always been a pressing *** to the complexity of the traumatic nasal anatomical structure,such procedures are more complicated than ordinary cosmetic *** choice of reconstruction material should emphasize its inherent characteristics,such as biocompatibility,anti-infective ability,strength,and *** the development of rhinoplasty,the choice of material is less limited and composite materials have become *** review outlines current composite materials and techniques in posttraumatic augmentation rhinoplasty.

关键词： posttraumatic augmentation rhinoplasty composite materials osseous-cartilaginous rib grafts alloplastic implant acellular dermal matrix 3d-printed implants

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