共查询到12条相似文献，搜索用时 46 毫秒
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熔融沉积成型(Fused deposition modeling,FDM)因其制造成本低廉和工艺简易等特点成为现今增材制造(Additive manufacturing,AM)技术中应用最广泛的一种类型,而聚乳酸(Polylactic acid,PLA)也因其良好的可生物降解性和生物相容性成为FDM线材的主要原料。但是,PLA较差的脆性、韧性及热稳定性等缺点严重限制了其打印产品在市场上的应用。因此,在PLA线材中加入某种或多种填料是解决其自身缺点的重要措施。其中,生物质填料是一种比较理想的选择,在PLA中加入生物质填料不仅可以有效克服基材的性能缺陷,而且产品具有良好的可生物降解性和环境友好性。本文综述了近几年来FDM打印生物质填料增强PLA复合材料的研究进展,阐释不同尺度结构(由微米尺寸到纳米尺寸)的生物质增强填料(如木粉、天然纤维、纳米纤维素)对PLA基复合材料的性能影响,并分析和总结复合材料的性能改善原因及其界面相容机制,最后对FDM打印PLA基复合材料的未来发展进行了展望。 相似文献
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Qingxuan Liang Haoyu Yin Jiakun Feng Jiahui Xu Zhen Yang Yubing Duan Dichen Li 《Advanced Engineering Materials》2023,25(10):2370036
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熔融沉积成型技术(FDM)是一种无模成型技术,易实现复杂模型的个性化定制,使得它在航空、汽车、医疗行业具有广泛、潜在的应用。同时FDM打印也是一种逐层打印技术,但制件表面粗糙,限制了它的应用。文中回顾了近10年来,尤其是近3年来在改进FDM表面粗糙度方面的研究现状和进展,并从制件后处理、软件控制、数学模型预测、优化工艺参数及结合其它成型技术等多方面论述了国内外关于FDM打印件表面粗糙度的改进方法及研究进展。 相似文献
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Helge Klippstein Alejandro Diaz De Cerio Sanchez Hany Hassanin Yahya Zweiri Lakmal Seneviratne 《Advanced Engineering Materials》2018,20(2)
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Hui Yang Wan Ru Leow Ting Wang Juan Wang Jiancan Yu Ke He Dianpeng Qi Changjin Wan Xiaodong Chen 《Advanced materials (Deerfield Beach, Fla.)》2017,29(33)
Compared with traditional stimuli‐responsive devices with simple planar or tubular geometries, 3D printed stimuli‐responsive devices not only intimately meet the requirement of complicated shapes at macrolevel but also satisfy various conformation changes triggered by external stimuli at the microscopic scale. However, their development is limited by the lack of 3D printing functional materials. This paper demonstrates the 3D printing of photoresponsive shape memory devices through combining fused deposition modeling printing technology and photoresponsive shape memory composites based on shape memory polymers and carbon black with high photothermal conversion efficiency. External illumination triggers the shape recovery of 3D printed devices from the temporary shape to the original shape. The effect of materials thickness and light density on the shape memory behavior of 3D printed devices is quantified and calculated. Remarkably, sunlight also triggers the shape memory behavior of these 3D printed devices. This facile printing strategy would provide tremendous opportunities for the design and fabrication of biomimetic smart devices and soft robotics. 相似文献
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Wentao Zhai Bin Hu Mengya Li Junjie Jiang Mengnan Zhou 《Advanced Engineering Materials》2021,23(7):2001449
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Sang-Joon Ahn Junghwan Byun Hyeong-Joon Joo Jae-Hak Jeong Dae-Young Lee Kyu-Jin Cho 《Advanced Materials Technologies》2021,6(6):2100133
4D printing can address time-evolving structural functions that are unattainable by conventional 3D printing. Despite the advance in materials and printing techniques, however, 4D printing of continuity of shape representation that generally characterizes 3D matters is still challenging, because the existing methodologies mostly rely on a few discrete levels of strain and their spatial distributions. Here, a 4D printing strategy of shape memory polymers (SMPs) that can program continuous levels of shape-recovery strain is proposed. It is found that the irrecoverable state of the SMP and the corresponding recovery strain can be controlled in a continuous and precise manner by a single printing parameter. Importantly, the continuity of strain programming provides an opportunity for the translation into mathematical function representation (F-rep), which allows the systematic derivation and implementation of 4D-printed bilayer strain functions that are matched to the continuously varying curvatures of the target geometry. Combined with the custom-built software, the F-rep 4D printing strategy can produce 4D-printed architectures that involve continuously varying strain profiles of almost any function type. The effectiveness of the framework is highlighted by a set of 3D face masks with facial feature transformation driven by a function operator. 相似文献
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Leipeng Yang Xin Liu Yuan Xiao Yongyan Zhang Gaiping Zhang Yuping Wang 《Advanced Materials Technologies》2023,8(7):2201638
As one of the widely used additive manufacturing technologies, FDM has been limited by small variety of available materials, poor mechanical properties, and lack of functionality of the FDM-printed parts. In this study, CNT/TPU filaments are prepared, and their thermal behavior is determined to lay the foundation for FDM process. The effects of the CNT content on the mechanical and conductivity properties of FDM-printed samples are investigated, and the FDM-printed CNT/TPU dielectric layers are explored for capacitive sensing applications. The results show that the incorporation of CNT significantly affects their mechanical, electrical, and capacitive sensing properties. The addition of 6 wt.% CNT increases the tensile strength by 199%, the flexural strength by 34%, and the electrical resistivity from 1.35 × 1010 to 7.26 × 103 Ω sq−1. The sensitivity of the sensor with the FDM-printed CNT/TPU dielectric layer microstructure is 0.04034 kPa−1 (0–20 kPa). The prepared CNT/TPU sensors have the advantages of wide detection range (0–800 kPa), a rapid response time (60 ms), and good repeatability, and have potential applications in detecting physical pressure, human motion, and human-computer interaction. In conclusion, the CNT/TPU composite prepared in this study increases the types of suitable materials for FDM and expands the application potential of FDM. 相似文献
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Recently, continuous fibre reinforcement has been combined with three-dimensional (3D) printing to create stiffer printed components. This study investigates the effect of wire volume fraction, type of polymer matrix, and wire treatment on the flexural properties of 3D printed continuous wire polymer composites (CWPCs) through a design of experiment study. CWPC samples were printed using a modified, open-source 3D printer. The flexural properties were measured and compared to non-reinforced samples. An analytical model was developed to describe the stress distribution across unidirectional CWPCs as a function of the geometrical printing parameters, reinforcement dimensions, and material properties. Sample failure analysis was performed to investigate failure modes and offer insight into further enhancement of the composite’s properties. 相似文献